Cisco IOS Configuration Fundamentals Command Reference
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L through mode

L through mode

length

To set the terminal screen length, use the length command in line configuration mode. To restore the default value, use the no form of this command.

length screen-length

no length

Syntax Description

screen-length

The number of lines on the screen. A value of zero disables pausing between screens of output.

Command Default

Screen length of 24 lines

Command Modes

Line configuration

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

The Cisco IOS software uses the value of this command to determine when to pause during multiple-screen output. Not all commands recognize the configured screen length. For example, the show terminal command assumes a screen length of 24 lines or more.

Examples

In the following example, the terminal type is specified and the screen pause function is disabled for the terminal connection on line 6:

Router(config)# line 6
Router(config-line)# terminal-type VT220
Router(config-line)# length 0

Related Commands

Command

Description

terminal length

Sets the number of lines on the current terminal screen for the current session.

load-interval

To change the length of time for which data is used to compute load statistics, use the load-interval command in interface configuration mode or Frame Relay DLCI configuration mode. To revert to the default setting, use the noform of this command.

load-interval seconds

no load-interval seconds

Syntax Description

seconds

Length of time for which data is used to compute load statistics. Value is a multiple of 30, from 30 to 600 (30, 60, 90, 120, and so on). The default is 300 seconds.

Command Default

Enabled

Command Modes

Interface configuration Frame Relay DLCI configuration

Command History

Release

Modification

10.3

This command was introduced.

12.2(4)T

This command was made available in Frame Relay DLCI configuration mode.

12.2(18)SXF

Support for this command was introduced on the Supervisor Engine 720.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

15.1(2)SNG

This command was implemented on the Cisco ASR 901 Series Aggregation Services Routers.

Usage Guidelines

To make computations more reactive to short bursts of traffic, you can shorten the length of time over which load averages are computed.

If the load interval is set to 30 seconds, new data is used for load calculations over a 30-second period. This data is used to compute load statistics, including the input rate in bits and packets per second, the output rate in bits and packets per second, the load, and reliability.

Load data is gathered every five seconds. This data is used for a weighted-average calculation in which recent load data has more weight in the computation than older load data. If the load interval is set to 30 seconds, the average is computed for the last 30 seconds of load data.

If you change the calculation interval from the default of five minutes to a shorter period of time, the input and output statistics that are displayed by the show interface command or the show frame-relay pvc command will be more current and will be based on more nearly instantaneous data, rather than reflecting the average load over a longer period of time.

This command is often used for dial backup purposes to increase or decrease the likelihood of implementation of a backup interface, but it can be used on any interface.

Examples

Examples

In the following example, the default average of five minutes is changed to a 30-second average. A burst in traffic that would not trigger a dial backup for an interface configured with the default five-minute interval might trigger a dial backup for this interface, which is set for the shorter 30-second interval.

Router(config)# interface serial 0
Router(config-if)# load-interval 30

Examples

In the following example, the load interval is set to 60 seconds for a Frame Relay PVC with the DLCI 100:

Router(config)# interface serial 1/1
Router(config-if)# frame-relay interface-dlci 100
Router(config-fr-dlci)# load-interval 60

Related Commands

Command

Description

show interfaces

Displays statistics for all interfaces configured on the router or access server.

location

To provide a description of the location of a serial device, use the location command in line configuration mode. To remove the description, use the no form of this command.

location text

no location

Syntax Description

text

Location description.

Command Default

A location description is not provided.

Command Modes

Line configuration (config-line)

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

The location command enters information about the device location and status. Use the show users all EXEC command to display the location information.

Examples

In the following example, the location description for the console line is given as “Building 3, Basement”:

Router(config)# line console
Router(config-line)# location Building 3, Basement

Related Commands

Command

Description

show users

Displays information about the active lines on a router.

lock

To configure a temporary password on a line, use the lockcommand in EXEC mode.

lock

Syntax Description

This command has no arguments or keywords.

Command Default

Not locked

Command Modes

EXEC

Command History

Release

Modification

10.0

This command was introduced in a release prior to Cisco IOS Release 10.0.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

You can prevent access to your session while keeping your connection open by setting up a temporary password. To lock access to the terminal, perform the following steps:

  1. Enter the lock command. The system prompts you for a password.
  2. Enter a password, which can be any arbitrary string. The system will prompt you to confirm the password. The screen then clears and displays the message “Locked.”
  3. To regain access to your sessions, reenter the password.

The Cisco IOS software honors session timeouts on a locked lines. You must clear the line to remove this feature. The system administrator must set the line up to allow use of the temporary locking feature by using the lockable line configuration command.

Examples

The following example shows configuring the router as lockable, saving the configuration, and then locking the current session for the user:

Router(config-line)# lockable
Router(config-line)# ^Z
Router# copy system:running-config nvram:startup-config
Building configuration...
OK
Router# lock
 
Password: <password>
Again: <password>
                      Locked
Password: <password>
Router#

Related Commands

Command

Description

lockable

Enables the lock EXEC command.

login (EXEC)

Enables or changes a login username.

lockable

To enable use of the lock EXEC command, use the lockablecommand in line configuration mode. To reinstate the default (the terminal session cannot be locked), use the noform of this command.

lockable

no lockable

Syntax Description

This command has no arguments or keywords.

Command Default

Sessions on the line are not lockable (the lock EXEC command has no effect).

Command Modes

Line configuration

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

This command enables use of temporary terminal locking, which is executed using the lock EXEC command. Terminal locking allows a user keep the current session open while preventing access by other users.

Examples

In the following example, the terminal connection is configured as lockable, then the current connection is locked:

Router# configure terminal
Router(config)# line console 0
Router(config-line)# lockable
Router(config)# ^Z
Router# lock
Password: <password>
Again: <password>
                      Locked
 
Password: <password>
Router#

Related Commands

Command

Description

lock

Prevents access to your session by other users by setting a temporary password on your terminal line.

log config

To enter configuration change logger configuration mode, use the log configcommand in archive configuration mode.

log config

Syntax Description

This command has no arguments or keywords.

Command Default

Configuration change logger configuration mode is not entered.

Command Modes

Archive configuration (config-archive)

Command History

Release

Modification

12.3(4)T

This command was introduced.

12.2(25)S

This command was integrated into Cisco IOS Release 12.2(25)S.

12.2(27)SBC

This command was integrated into Cisco IOS Release 12.2(27)SBC.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(33)SB

This command was integrated into Cisco IOS Release 12.2(33)SB and implemented on the Cisco 10000 series.

Cisco IOS XE Release 3.9S

This command was integrated into Cisco IOS XE Release 3.9S.

Examples

The following example shows how to place the device in configuration change logger configuration mode:

Device# configure terminal
!
Device(config)# archive
Device(config-archive)# log config
Device(config-archive-log-config)# 

Related Commands

Command

Description

archive

Enters archive configuration mode.

hidekeys

Suppresses the display of password information in configuration log files.

logging enable

Enables the logging of configuration changes.

logging size

Specifies the maximum number of entries retained in the configuration log.

notify syslog

Enables the sending of notifications of configuration changes to a remote syslog.

show archive log config

Displays entries from the configuration log.

logging buginf

To allow debug messages to be generated for the standard system logging buffer, use the logging buginfcommand in global configuration mode. To disable the logging for debugging functionality, use the no form of this command.

logging buginf

no logging buginf

Syntax Description

This command has no arguments or keywords.

Command Default

Debug messages are not suppressed.

Command Modes

Global configuration (config)

Command History

Release

Modification

15.0(1)M

This command was introduced in a release earlier than Cisco IOS Release 15.0(1)M.

12.2(33)SRC

This command was integrated into a release earlier than Cisco IOS Release 12.2(33)SRC.

12.2(33)SXI

This command was integrated into a release earlier than Cisco IOS Release 12.2(33)SXI.

Cisco IOS XE Release 2.1

This command was integrated into Cisco IOS XE Release 2.1.

Usage Guidelines

The no logging buginfcommand is used to avoid a situation where a large amount of debug messages might overload the processor (CPU hog condition). This condition differs from the use of the undebug allcommand wherein all debugging calls are disabled in the Cisco IOS software. No debug reporting is available, even if debugging is enabled. Note that even though debugging has been completely disabled in the system, other message reporting, including error reporting, is still available.

Examples

The following example shows how to enable buginf logging for debugging:

Router# configure terminal
Router(config)# logging buginf

Related Commands

Command

Description

show logging

Displays the state of system logging (syslog) and the contents of the standard system logging buffer.

logging enable

To enable the logging of configuration changes, use the logging enable command in configuration change logger configuration mode. To disable the logging of configuration changes, use the no form of this command.

logging enable

no logging enable

Syntax Description

This command has no arguments or keywords.

Command Default

Configuration change logging is disabled.

Command Modes

Configuration change logger configuration (config-archive-log-config)

Command History

Release

Modification

12.3(4)T

This command was introduced.

12.2(25)S

This command was integrated into Cisco IOS Release 12.2(25)S.

12.2(27)SBC

This command was integrated into Cisco IOS Release 12.2(27)SBC.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(33)SB

This command was integrated into Cisco IOS Release 12.2(33)SB and implemented on the Cisco 10000 series.

Cisco IOS XE Release 3.9S

This command was integrated into Cisco IOS XE Release 3.9S.

Usage Guidelines

Use this command if you want to log configuration changes. If you disable configuration logging, all configuration log records that were collected are purged.

Examples

The following example shows how to enable configuration logging:

Device# configure terminal
!
Device(config)# archive
Device(config-archive)# log config
Device(config-archive-log-config)# logging enable
Device(config-archive-log-config)# end

The following example shows how to clear the configuration log by disabling and then reenabling the configuration log:

Device# configure terminal
!
Device(config)# archive
Device(config-archive)# log config
Device(config-archive-log-config)# no logging enable
Device(config-archive-log-config)# logging enable
Device(config-archive-log-config)# end

Related Commands

Command

Description

archive

Enters archive configuration mode.

hidekeys

Suppresses the display of password information in configuration log files.

log config

Enters configuration change logger configuration mode.

logging size

Specifies the maximum number of entries retained in the configuration log.

notify syslog

Enables the sending of notifications of configuration changes to a remote syslog.

show archive log config

Displays entries from the configuration log.

logging esm config

To permit configuration changes from Embedded Syslog Manager (ESM) filters, use the logging esm config command in global configuration mode. To disable the configuration, use the no form of this command.

logging esm config

no logging esm config

Syntax Description

This command has no arguments or keywords.

Command Default

ESM filters are enabled.

Command Modes

Global configuration (config)

Command History

Release

Modification

15.0(1)M

This command was introduced in a release earlier than Cisco IOS Release 15.0(1)M.

12.2(33)SRC

This command was integrated into a release earlier than Cisco IOS Release 12.2(33)SRC.

12.2(33)SXI

This command was integrated into a release earlier than Cisco IOS Release 12.2(33)SXI.

Cisco IOS XE Release 2.1

This command was integrated into Cisco IOS XE Release 2.1.

Usage Guidelines

You can use the no logging esm config command to disallow configuration changes from ESM filters.

Examples

The following example shows how to configure the ESM filters:

Router# configure terminal
Router(config)# logging esm config

Related Commands

Command

Description

logging filter

Specifies a syslog filter module to be used by the ESM.

logging event bundle-status

To enable message bundling, use the logging event bundle-status command in interface configuration mode. To disable message bundling, use the no form of this command.

logging event bundle-status

no logging event bundle-status

Syntax Description

default

Enables system logging of interface state-change events on all interfaces in the system.

boot

Enables system logging of interface state-change events on all interfaces in the system during system initialization.

Command Default

Message bundling does not occur.

Command Modes

Global configuration

Command History

Release

Modification

12.2(14)SX

Support for this command was introduced on the Supervisor Engine 720.

12.2(17d)SXB

Support for this command on the Supervisor Engine 2 was extended to Release 12.2(17d)SXB.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

The logging event bundle-status command is not applicable on Port Channel or Ether-Channel interfaces.

Examples

This example shows how to enable the system logging of the interface state-change events on all interfaces in the system:

Router(config)# logging event bundle-status
Router(config)# end
Router # show logging event bundle-status
*Aug 4 17:36:48.240 UTC: %EC-SP-5-UNBUNDLE: Interface FastEthernet9/23 left the port-channel Port-channel2
*Aug 4 17:36:48.256 UTC: %LINK-SP-5-CHANGED: Interface FastEthernet9/23, changed state to administratively down
*Aug 4 17:36:47.865 UTC: %EC-SPSTBY-5-UNBUNDLE: Interface FastEthernet9/23 left the port-channel Port-channel2
Router # show logging event bundle-status
*Aug 4 17:37:35.845 UTC: %EC-SP-5-BUNDLE: Interface FastEthernet9/23 joined port-channel Port-channel2
*Aug 4 17:37:35.533 UTC: %EC-SPSTBY-5-BUNDLE: Interface FastEthernet9/23 joined port-channel Port-channel2

Related Commands

Command

Description

show running-config

Displays the status and configuration of the module or Layer 2 VLAN.

logging event link-status (global configuration)

To change the default or set the link-status event messaging during system initialization, use the logging event link-status command in global configuration mode. To disable the link-status event messaging, use the no form of this command.

logging event link-status { default | boot }

no logging event link-status { default | boot }

Syntax Description

default

Enables system logging of interface state-change events on all interfaces in the system.

boot

Enables system logging of interface state-change events on all interfaces in the system during system initialization.

Command Default

Interface state-change messages are not sent.

Command Modes

Global configuration

Command History

Release

Modification

12.2(14)SX

Support for this command was introduced on the Supervisor Engine 720.

12.2(17d)SXB

Support for this command on the Supervisor Engine 2 was extended to Release 12.2(17d)SXB.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

You do not have to enter the logging event link-status boot command to enable link-status messaging during system initialization. The logging event link-status default command logs system messages even during system initialization.

If you enter both the logging event link-status default and the no logging event link-status bootcommands, the interface state-change events are logged after all modules in the Cisco 7600 series router come online after system initialization. The logging event link-status default and the no logging event link-status boot commands are saved and retained in the running configuration of the system.

When both the logging event link-status default and the no logging event link-status bootcommands are present in the running configuration and you want to display the interface state-change messages during system initialization, enter the logging event link-status boot command.

Examples

This example shows how to enable the system logging of the interface state-change events on all interfaces in the system:

Router(config)# logging event link-status default
Router(config)# 

This example shows how to enable the system logging of interface state-change events on all interfaces during system initialization:

Router(config)# logging event link-status boot
Router(config)# 

This example shows how to disable the system logging of interface state-change events on all interfaces:

Router(config)# no logging event link-status default
Router(config)# 

This example shows how to disable the system logging of interface state-change events during system initialization:

Router(config)# no logging event link-status boot
Router(config)# 

Related Commands

Command

Description

show running-config

Displays the status and configuration of the module or Layer 2 VLAN.

logging event link-status (interface configuration)

To enable link-status event messaging on an interface, use the logging event link-status command in interface configuration mode. To disable link-status event messaging, use the no form of this command.

logging event link-status [ bchan | dchan | nfas ]

no logging event link-status [ bchan | dchan | nfas ]

Syntax Description

bchan

(Optional) Logs B-channel status messages. This keyword is available only for integrated services digital network (ISDN) serial interfaces.

dchan

(Optional) Logs D-channel status messages. This keyword is available only for ISDN serial interfaces.

nfas

(Optional) Logs non-facility associated signaling (NFAS) D-channel status messages. This keyword is available only for ISDN serial interfaces.

Command Default

Interface state-change messages are not sent.

Command Modes

Interface configuration (config-if)

Command History

Release

Modification

12.2(14)SX

This command was introduced on the Supervisor Engine 720.

12.2(17d)SXB

This command was modified to support the Supervisor Engine 2.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

To enable system logging of interface state-change events on a specific interface, enter the logging event link-status command.

Examples

The following example shows how to enable link-status event messaging on an interface:

Router(config-if)# logging event link-status

This example shows how to disable link-status event messaging on an interface:

Router(config-if)# no logging event link-status 

logging event subif-link-status

To enable the link-status event messaging on a subinterface, use the logging event subif-link-status command in interface configuration mode. To disable the link-status event messaging on a subinterface, use the no form of this command.

logging event subif-link-status

no logging event subif-link-status

Syntax Description

This command has no arguments or keywords.

Command Default

Subinterface state-change messages are not sent.

Command Modes

Interface configuration

Command History

Release

Modification

12.2(17d)SXB

Support for this command on the Supervisor Engine 2 was extended to Release 12.2(17d)SXB.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

This command is not supported on Cisco 7600 series routers that are configured with a Supervisor Engine 720.

To enable system logging of interface state-change events on a specific subinterface, enter the logging event subif-link-status command.

To enable system logging of interface state-change events on a specific interface, enter the logging event link-status command.

To enable system logging of interface state-change events on all interfaces in the system, enter the logging event link-status command.

Examples

This example shows how to enable the system logging of the interface state-change events on a subinterface:

Router(config-if)# logging event subif-link-status
Router(config-if)# 

This example shows how to disable the system logging of the interface state-change events on a subinterface:

Router(config-if)# no logging event subif-link-status
Router(config-if)# 

Related Commands

Command

Description

show running-config

Displays the status and configuration of the module or Layer 2 VLAN.

logging event trunk-status

To enable trunk status messaging, use the logging event trunk-status command in interface configuration mode. To disable trunk status messaging, use the no form of this command.

logging event trunk-status

no logging event trunk-status

Syntax Description

This command has no keywords or variables.

Command Default

This command has no default settings.

Command Modes

Interface configuration mode

Command History

Release

Modification

12.2(14)SX

Support for this command was introduced.

Usage Guidelines

The logging event bundle-status command is not applicable on Port Channel or Ether-Channel interfaces.

Examples

This example shows how to enable the trunk status messaging on physical ports:

Router(config)# logging event trunk-status
Router(config)# end
Router# show logging event trunk-status
*Aug 4 17:27:01.404 UTC: %DTP-SPSTBY-5-NONTRUNKPORTON: Port Gi3/3 has become non-trunk
*Aug 4 17:27:00.773 UTC: %DTP-SP-5-NONTRUNKPORTON: Port Gi3/3 has become non-trunk
Router#

logging reload

To set the reload logging level, use the logging reloadcommand in global configuration mode. To disable the reload logging, use the no form of this command.

logging reload [ message-limit number ] [ severity-level | alerts | critical | debugging | emergencies | errors | informational | notifications | warnings ]

no logging reload

Syntax Description

message-limit

(Optional) Sets the limit on the number of messages that can be logged during reload.

number

Number of messages. The range is from 1 to 4294967295.

severity-level

(Optional) Logging severity level. The range is from 0 to 7.

alerts

(Optional) Specifies that an immediate action is needed.

critical

(Optional) Specifies the critical conditions.

debugging

(Optional) Displays the debugging messages

emergencies

(Optional) Specifies that the system is unusable.

errors

(Optional) Specifies error conditions

informational

(Optional) Specifies error informational messages

notifications

(Optional) Specifies normal but significant conditions.

warnings

(Optional) Specifies warning conditions.

Command Default

The logging reload message limit is 1000 notifications.

Command Modes

Global configuration (config)

Command History

Release

Modification

15.0(1)M

This command was introduced in a release earlier than Cisco IOS Release 15.0(1)M.

12.2(33)SRC

This command was integrated into a release earlier than Cisco IOS Release 12.2(33)SRC.

12.2(33)SXI

This command was integrated into a release earlier than Cisco IOS Release 12.2(33)SXI.

Cisco IOS XE Releas e2.1

This command was integrated into Cisco IOS XE Release 2.1.

Usage Guidelines

The default setting is recommended. Setting the message-limit too low may result in losing important messages during reload. If the logging reload command is not enabled, logging is turned off during reload.

Examples

The following example shows how to set the limit on number of messages that can be logged during reload to 100:

Router# configure terminal
Router(config)# logging  reload message-limit 100

Related Commands

Command

Description

show logging

Displays the state of system logging (syslog) and the contents of the standard system logging buffer.

logging ip access-list cache (global configuration)

To configure the Optimized ACL Logging (OAL) parameters, use the logging ip access-list cache command in global configuration mode. To return to the default settings, use the no form of this command.

logging ip access-list cache { entries entries | interval seconds | rate-limit pps | threshold packets }

no logging ip access-list cache [ entries | interval | rate-limit | threshold ]

Syntax Description

entries entries

Specifies the maximum number of log entries that are cached in the software; valid values are from 0 to 1048576 entries.

interval seconds

Specifies the maximum time interval before an entry is sent to syslog; valid values are from 5 to 86400 seconds.

rate-limit pps

Specifies the number of packets that are logged per second in the software; valid values are from 10 to 1000000 pps.

threshold packets

Specifies the number of packet matches before an entry is sent to syslog; valid values are from 1 to 1000000 packets.

Command Default

The defaults are as follows:

  • entries --8000 entries.
  • seconds --300 seconds (5 minutes).
  • rate-limit pps --0 (rate limiting is off) and all packets are logged.
  • threshold packets --0 (rate limiting is off) and the system log is not triggered by the number of packet matches.

Command Modes

Global configuration

Command History

Release

Modification

12.2(17d)SXB

Support for this command was introduced on the Supervisor Engine 720.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

This command is supported on Cisco 7600 series routers that are configured with a Supervisor Engine 720 only.

OAL is supported on IPv4 unicast traffic only.

You cannot configure OAL and VACL capture on the same chassis. OAL and VACL capture are incompatible. With OAL configured, use SPAN to capture traffic.

If the entry is inactive for the duration that is specified in the update-interval seconds command, th e entry is removed from the cache.

If you enter the no logging ip access-list cache command without keywords, all the parameters are returned to the default values.

You must set ICMP unreachable rate limiting to 0 if the OAL is configured to log denied packets.

When enabling the IP "too short" check using the mls verify ip length minimum command, valid IP packets with with an IP protocol field of ICMP(1), IGMP(2), IP(4), TCP(6), UDP(17), IPv6(41), GRE(47), or SIPP-ESP(50) will be hardware switched. All other IP protocol fields are software switched.


Caution


Using optimized access-list logging (OAL) and the mls verify ip length minimum command together can cause routing protocol neighbor flapping as they are incompatible


Examples

This example shows how to specify the maximum number of log entries that are cached in the software:

Router(config)# 
logging ip access-list cache entries 200

This example shows how to specify the maximum time interval before an entry is sent to the system log:

Router(config)# 
logging ip access-list cache interval 350

This example shows how to specify the number of packets that are logged per second in the software:

Router(config)# 
logging ip access-list cache rate-limit 100

This example shows how to specify the number of packet matches before an entry is sent to the system log:

Router(config)# 
logging ip access-list cache threshold 125

Related Commands

Command

Description

clear logging ip access-list cache

Clears all the entries from the OAL cache and sends them to the syslog.

logging ip access-list cache (interface configuration)

Enables an OAL-logging cache on an interface that is based on direction.

show logging ip access-list

Displays information about the logging IP access list.

update-interval seconds

Removes entries from the cache that are inactive for the duration that is specified in the command.

logging ip access-list cache (interface configuration)

To enable an Optimized ACL Logging (OAL)-logging cache on an interface that is based on direction, use the logging ip access-list cache command in interface configuration mode. To disable OAL, use the no form of this command.

logging ip access-list cache [ in | out ]

no logging ip access-list cache

Syntax Description

in

(Optional) Enables OAL on ingress packets.

out

(Optional) Enables OAL on egress packets.

Command Default

Disabled

Command Modes

Interface configuration

Command History

Release

Modification

12.2(17d)SXB

Support for this command was introduced on the Supervisor Engine 720.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

This command is supported on Cisco 7600 series routers that are configured with a Supervisor Engine 720 only.

This command is supported on traffic that matches the log keyword in the applied ACL. You must set ICMP unreachable rate limiting to 0 if the OAL is configured to log denied packets.

On systems that are configured with a PFC3A, support for the egress direction on tunnel interfaces is not supported.

OAL is supported on IPv4 unicast traffic only.

You cannot configure OAL and VACL capture on the same chassis. OAL and VACL capture are incompatible. With OAL configured, use SPAN to capture traffic.

If the entry is inactive for the duration that is specified in the update-interval seconds command, th e entry is removed from the cache.

If you enter the no logging ip access-list cache command without keywords, all the parameters are returned to the default values.

When enabling the IP "too short" check using the mls verify ip length minimum command, valid IP packets with with an IP protocol field of ICMP(1), IGMP(2), IP(4), TCP(6), UDP(17), IPv6(41), GRE(47), or SIPP-ESP(50) will be hardware switched. All other IP protocol fields are software switched.


Caution


Using optimized access-list logging (OAL) and the mls verify ip length minimum command together can cause routing protocol neighbor flapping as they are incompatible


Examples

This example shows how to enable OAL on ingress packets:

Router(config-if)# 
logging ip access-list cache in

This example shows how to enable OAL on egress packets:

Router(config-if)# 
logging ip access-list cache out

Related Commands

Command

Description

clear logging ip access-list cache

Clears all the entries from the OAL cache and sends them to the syslog.

logging ip access-list cache (global configuration)

Configures the OAL parameters.

show logging ip access-list

Displays information about the logging IP access list.

update-interval seconds

Removes entries from the cache that are inactive for the duration that is specified in the command.

logging persistent (config-archive-log-cfg)

To enable the configuration logging persistent feature and to select how the configuration commands are to be saved to the Cisco IOS secure file system, use the logging persistent command in the log config submode of archive configuration mode. To disable this capability, use the no form of this command.

logging persistent { auto | manual }

no logging persistent { auto | manual }

Syntax Description

auto

Specifies that each configuration command will be saved automatically to the Cisco IOS secure file system.

manual

Specifies that each configuration command must be saved manually to the Cisco IOS secure file system.

Command Default

The configuration commands are not saved to the Cisco IOS secure file system.

Command Modes

Archive configuration mode, log config (configuration-change logger) submode (config-archive-log-cfg)#

Command History

Release

Modification

12.0(26)S

This command was introduced.

12.2(25)S

This command was integrated into Cisco IOS Release 12.2(25)S.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.4(11)T

This command was integrated into Cisco IOS Release 12.4(11)T.

12.2(33)SXH

This command was integrated into Cisco IOS Release 12.2(33)SXH.

12.2(33)SB

This command was integrated into Cisco IOS Release 12.2(33)SB.

Usage Guidelines

When you use the manualkeyword, you must save each configuration command manually to the Cisco IOS secure file system. To do this, you must use the archive log config persistent save command.

Examples

The following example automatically saves the configuration commands to the Cisco IOS secure file system:

Router(config)# archive 
Router(config-archive)# log config 
Router(config-archive-log-cfg)# logging enable 
Router(config-archive-log-cfg)# logging persistent auto 

Related Commands

Command

Description

logging persistent reload

Sequentially applies configuration commands in the configuration logger database to the running-config file after a reload.

archive log config persistent save

Saves the persisted commands in the configuration log to the Cisco IOS secure file system.

logging persistent reload (config-archive-log-cfg)

To sequentially apply the configuration commands saved in the configuration logger database (since the last write memorycommand) to the running-config file after a reload, use the logging persistent reload command in configuration change logger configuration mode in archive configuration mode. To disable this capability, use the no form of this command.

logging persistent reload

no logging persistent reload

Syntax Description

This command has no arguments or keywords.

Command Default

The configuration commands saved in the configuration logger database are not applied to the running-config file.

Command Modes

Archive config mode; log config (configuration change logger) submode (config-archive-log-cfg)#

Command History

Release

Modification

12.2(33)SRA

This command was introduced.

12.4(11)T

This command was integrated into Cisco IOS Release 12.4(11)T.

12.2(33)SXH

This command was integrated into Cisco IOS Release 12.2(33)SXH.

12.2(33)SB

This command was integrated into Cisco IOS Release 12.2(33)SB.

Usage Guidelines

Use the logging persistent reload command when you want changed configuration commands to take effect on the next reload of the router.

Examples

The following example applies the configuration commands in the configuration logger database to the running-config file after the next reload:

Router(config-archive-log-cfg)# logging persistent reload

Related Commands

Command

Description

logging persistent

Enables the configuration logging persistent feature.

logging size

To specify the maximum number of entries retained in the configuration log, use the logging size command in configuration change logger configuration mode. To reset the default value, use the no form of this command.

logging size entries

no logging size

Syntax Description

entries

The maximum number of entries retained in the configuration log. Valid values range from 1 to 1000. The default value is 100 entries.

Command Default

100 entries

Command Modes

Configuration change logger configuration (config-archive-log-config)

Command History

Release

Modification

12.3(4)T

This command was introduced.

12.2(25)S

This command was integrated into Cisco IOS Release 12.2(25)S.

12.2(27)SBC

This command was integrated into Cisco IOS Release 12.2(27)SBC.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(33)SB

This command was integrated into Cisco IOS Release 12.2(33)SB and implemented on the Cisco 10000 series.

Cisco IOS XE Release 3.9S

This command was integrated into Cisco IOS XE Release 3.9S.

Usage Guidelines

When the configuration log is full, the oldest log entry is removed every time a new entry is added.


Note


If a new log size is specified that is smaller than the current log size, the oldest entries will be immediately purged until the new log size is satisfied, regardless of the age of the log entries.


Examples

The following example shows how to specify that the configuration log may have a maximum of 200 entries:

Device(config-archive-log-config)# logging size 200

The following example shows how to clear the configuration log by reducing the log size to 1, then resetting the log size to the desired value. Only the most recent configuration log file will be saved.

Device(config)# archive
Device(config-archive)# log config
Device(config-archive-log-config)# logging size 1
Device(config-archive-log-config)# logging size 200

Related Commands

Command

Description

archive

Enters archive configuration mode.

hidekeys

Suppresses the display of password information in configuration log files.

log config

Enters configuration change logger configuration mode.

logging enable

Enables the logging of configuration changes.

notify syslog

Enables the sending of notifications of configuration changes to a remote syslog.

show archive log config

Displays entries from the configuration log.

logging synchronous

To synchronize unsolicited messages and debug output with solicited Cisco IOS software output and prompts for a specific console port line, auxiliary port line, or vty, use the logging synchronous command in line configuration mode. To disable synchronization of unsolicited messages and debug output, use the no form of this command.

logging synchronous [ level severity-level | all ] [ limit number-of-lines ]

no logging synchronous [ level severity-level | all ] [ limit number-of-lines ]

Syntax Description

level severity-level

(Optional) Specifies the message severity level. Messages with a severity level equal to or higher than this value are printed asynchronously. Low numbers indicate greater severity and high numbers indicate lesser severity. The default value is 2.

all

(Optional) Specifies that all messages are printed asynchronously, regardless of the severity level.

limit number-of-lines

(Optional) Specifies the number of buffer lines to be queued for the terminal, after which new messages are dropped. The default value is 20.

Command Default

This command is disabled.

If you do not specify a severity level, the default value of 2 is assumed.

If you do not specify the maximum number of buffers to be queued, the default value of 20 is assumed.

Command Modes

Line configuration

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2SX

This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware.

Usage Guidelines

When synchronous logging of unsolicited messages and debug output is turned on, unsolicited Cisco IOS software output is displayed on the console or printed after solicited Cisco IOS software output is displayed or printed. This keeps unsolicited messages and debug output from being interspersed with solicited software output and prompts.


Tip


This command is useful for keeping system messages from interrupting your typing. By default, messages will appear immediately when they are processed by the system, and the CLI cursor will appear at the end of the displayed message. For example, the line “Configured by console from console” may be printed to the screen, interrupting whatever command you are currently typing. The logging synchronous command allows you to avoid these potentially annoying interruptions without have to turn off logging to the console entirely.


When this command is enabled, unsolicited messages and debug output are displayed on a separate line than user input. After the unsolicited messages are displayed, the CLI returns to the user prompt.


Note


This command is also useful for allowing you to continue typing when debugging is enabled.


When specifying a severity level number, consider that for the logging system, low numbers indicate greater severity and high numbers indicate lesser severity.

When a message queue limit of a terminal line is reached, new messages are dropped from the line, although these messages might be displayed on other lines. If messages are dropped, the notice %SYS-3-MSGLOST number-of-messages due to overflow” follows any messages that are displayed. This notice is displayed only on the terminal that lost the messages. It is not sent to any other lines, any logging servers, or the logging buffer.


Caution


By configuring abnormally large message queue limits and setting the terminal to “terminal monitor” on a terminal that is accessible to intruders, you expose yourself to “denial of service” attacks. An intruder could carry out the attack by putting the terminal in synchronous output mode, making a Telnet connection to a remote host, and leaving the connection idle. This could cause large numbers of messages to be generated and queued, and these messages could consume all available RAM. You should guard against this type of attack through proper configuration.


Examples

In the following example, a system message appears in the middle of typing the show running-config command:

Router(config-line)# end
Router# show ru
2w1d: %SYS-5-CONFIG_I: Configured from console by consolenning-config
 .
 .
 .

The user then enables synchronous logging for the current line (indicated by the * symbol in the show line command), after which the system displays the system message on a separate line, and returns the user to the prompt to allow the user to finish typing the command on a single line:

Router# show line
 
   Tty Typ     Tx/Rx    A Modem  Roty AccO AccI   Uses   Noise  Overruns   Int
*    0 CTY              -    -      -    -    -      0       3     0/0       -
 .
 .
 .
Router# configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)# line 0 
Router(config-line)# logging syn
<tab> 
Router(config-line)# logging synchronous
 
Router(config-line)# end
 
Router# show ru
 
2w1d: %SYS-5-CONFIG_I: Configured from console by console
Router# show running-config

In the following example, synchronous logging for line 4 is enabled with a severity level of 6. Then synchronous logging for line 2 is enabled with a severity level of 7 and is specified with a maximum number of buffer lines of 1,000.

Router(config)# line 4 
Router(config-line)# logging synchronous level 6 
Router(config-line)# exit 
Router(config)# line 2 
Router(config-line)# logging synchronous level 7 limit 1000 
Router(config-line)# end 
Router# 

Related Commands

Command

Description

line

Identifies a specific line for configuration and starts the line configuration command collection mode.

logging on

Controls logging of error messages and sends debug or error messages to a logging process, which logs messages to designated locations asynchronously to the processes that generated the messages.

logging system

To enable System Event Archive (SEA) logging, use the logging systemcommand in global configuration mode. To disable SEA logging, use the no form of this command.

logging system [ disk name ]

no logging system

Syntax Description

disk name

(Optional) Stores the system event archive (system event log file) in the specified disk. The specified disk must be already have been configured to allow for the storage of the system event archive.

Command Default

By default, SEA logging feature is enabled, and the events are logged to a file on a persistent storage device (bootflash: or disk:).

Command Modes

Global configuration (config)

Command History

Release

Modification

12.2(33)SXH

This command was introduced.

12.2(33)SCC

The command was introduced for the Cisco uBR10012 router in the Cisco IOS Software Release 12.2(33)SCC.

Usage Guidelines

SEA is supported on switches that have a Supervisor Engine 32 or Supervisor Engine 720 with a compact flash adapter and a Compact Flash card (WS-CF-UPG= for Supervisor Engine 720).

To stop SEA logging to a specified disk, use the default logging system command.

For documentation of the configuration tasks associated with this feature, see the chapter “Configuring the System Event Archive” in the Catalyst 6500 Release 12.2SX Software Configuration Guide .

Cisco Universal Broadband Router 100112

The SEA feature is used to address the deficiencies of the debug trace and system console. Support for SEA feature was introduced on Cisco uBR10012 Router in the Cisco IOS Release 12.2(33)SCC. Use the logging system disk command to change the location of the disk used to store the sea_log.dat file.


Note


To store the system event logs, the SEA requires either PCMCIA ATA disk or Compact Flash disk in compact flash adapter for PRE2.


Examples

The following example shows how to specify that the SEA log file should be written to the disk “disk1:”:

Router(config)# logging system disk disk1:
 
Router(config)# end
 

Related Commands

clear logging system

Clears the event records stored in the SEA.

copy logging system

Copies the archived system event log to another location.

show logging system

Displays the SEA logging system disk.

logout

To close an active terminal session by logging off the router, use the logout command in user EXEC mode.

logout

Syntax Description

This command has no arguments or keywords.

Command Default

No default behavior or values.

Command Modes

User EXEC

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Examples

In the following example, the exit (global) command is used to move from global configuration mode to privileged EXEC mode, the disable command is used to move from privileged EXEC mode to user EXEC mode, and the logout command is used to log off (exit from the active session):

Router(config)# exit
Router# disable
Router> logout
 

logout-warning

To warn users of an impending forced timeout, use the logout-warningcommand in line configuration mode. To restore the default, use the no form of this command.

logout-warning [seconds]

logout-warning

Syntax Description

seconds

(Optional) Number of seconds that are counted down before session termination. If no number is specified, the default of 20 seconds is used.

Command Default

No warning is sent to the user.

Command Modes

Line configuration

Command History

Release

Modification

10.3

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

This command notifies the user of an impending forced timeout (set using the absolute-timeout command).

Examples

In the following example, a logout warning is configured on line 5 with a countdown value of 30 seconds:

Router(config)# line 5 
Router(config-line)# logout-warning 30

Related Commands

Command

Description

absolute-timeout

Sets the interval for closing user connections on a specific line or port.

session-timeout

Sets the interval for closing the connection when there is no input or output traffic.

macro (global configuration)

To create a global command macro, use the macrocommand in global configuration mode. To remove the macro, use the no form of this command.

macro { global { apply macro-name | description text | trace macro-name [keyword-to-value] value-first-keyword [keyword-to-value] value-second-keyword [keyword-to-value] value-third-keyword [keyword-to-value] } | name macro-name }

no macro { global { apply macro-name | description text | trace macro-name [keyword-to-value] value-first-keyword [keyword-to-value] value-second-keyword [keyword-to-value] value-third-keyword [keyword-to-value] } | name macro-name }

Syntax Description

global

Applies the macro globally.

apply macro-name

Applies a specified macro.

description text

Provides a description of the macros applied to the switch.

trace macro-name

Applies a specified macro with trace enabled.

keyword-to-value

(Optional) Keyword to replace with a value.

value-first-keyword

Value of the first keyword to replace.

value-second-keyword

Value of the second keyword to replace.

value-third-keyword

Value of the third keyword to replace.

name macro-name

Specifies the name of a macro.

Command Default

This command has no default setting.

Command Modes

Global configuration (config)

Command History

Release

Modification

12.2(33)SXH

This command was introduced.

15.0(1)M

This command was integrated into a release earlier than Cisco IOS Release 15.0(1)M.

Usage Guidelines

You can enter up to three keyword pairs using the macro global trace command.

You can enter the macro global descriptioncommand on the switch stack or on a standalone switch.

Use the description textkeyword and argument to associate the comment text, or the macro name with a switch. When multiple macros are applied on a switch, the description text is used from the last applied macro. You can verify the global description settings by using the show parser macro description command.

To find the syntax or configuration errors, enter the macro global trace macro-name command to apply and debug the macro.

To display a list of any keyword-value pairs defined in the macro, enter the macro global apply macro-name ? command.

You can delete a global macro-applied configuration on a switch only by entering the no version of each command that is in the macro.

Keyword matching is case sensitive.

When a macro is applied on the commands, all matching occurrences of keywords are replaced with the corresponding values.

The no form of the macro name command deletes only the macro definition. It does not affect the configuration of the interfaces on which the macro is already applied.

Examples

The following example shows how to apply the macro called snmp to set the hostname address to “test-server” and to set the IP precedence value to 7:

Router(config)# macro global apply snmp ADDRESS test-server VALUE 7 

The following example shows how to debug the macro called snmp by using the macro global trace command to find the syntax or configuration errors in the macro when it is applied to a switch:

Router(config)# macro global trace snmp VALUE 7 VALUE 8 VALUE 9 
Applying command...`snmp-server enable traps port-security'
Applying command...`snmp-server enable traps linkup'
Applying command...`snmp-server enable traps linkdown'
Applying command...`snmp-server host'
%Error Unknown error.
Applying command...`snmp-server ip precedence 7'
Router(config)#

Related Commands

Command

Description

macro (interface configuration)

Creates an interface-specific command macro.

show parser macro

Displays the smart port macros.

macro (interface configuration)

To create an interface-specific command macro, use the macro command in interface configuration mode. To remove the macro, use the no form of this command.

macro { apply macro-name | description text | trace macro-name [keyword-to-value] value-first-keyword [keyword-to-value] value-second-keyword [keyword-to-value] value-third-keyword [keyword-to-value] }

no macro { apply macro-name | description text | trace macro-name [keyword-to-value] value-first-keyword [keyword-to-value] value-second-keyword [keyword-to-value] value-third-keyword [keyword-to-value] }

Syntax Description

apply macro-name

Applies a specified macro.

description text

Specifies a description about the macros that are applied to the interface.

trace macro-name

Applies a specified macro with trace enabled.

keyword-to-value

(Optional) Keyword to replace with a value.

value-first-keyword

Value of the keyword to replace.

Command Default

This command has no default setting.

Command Modes

Interface configuration (config-if)

Command History

Release

Modification

12.2(33)SXH

This command was introduced.

Usage Guidelines

You can enter up to three keyword changes using the macro trace command.

You can enter the macro description command on the switch stack or on a standalone switch.

Use the description text keyword and argument to associate comment text, or the macro name, with a switch. When multiple macros are applied on a switch, the description text will be from the last applied macro. You can verify the description settings by entering the show parser macro description command.

To find any syntax or configuration errors, enter the macro trace macro-name command to apply and debug the macro.

To display a list of any keyword-value pairs defined in the macro, enter the macro apply macro-name ? command.

To successfully apply the macro, you must enter any required keyword-value pairs.

Keyword matching is case sensitive.

In the commands that the macro applies, all matching occurrences of keywords are replaced with the corresponding values.

You can delete all configuration on an interface by entering the default interface interfaceinterface configuration command.

Examples

The following example shows how to apply the user-created macro called desktop-config and to verify the configuration:

Router(config)# interface fastethernet1/2
 
Router(config-if)# macro apply desktop-config
 

The following example shows how to apply the user-created macro called desktop-config and to replace all occurrences of vlan with VLAN ID 25:

Router(config-if)# macro apply desktop-config vlan 25 

Related Commands

Command

Description

macro (global configuration)

Creates a command macro.

show parser macro

Displays the smart port macros.

maximum

To set the maximum number of archive files of the running configuration to be saved in the Cisco configuration archive, use the maximum command in archive configuration mode. To reset this command to its default, use the no form of this command.

maximum number

no maximum number

Syntax Description

number

Maximum number of archive files of the running configuration to be saved in the Cisco configuration archive. You can archive from 1 to 14 configuration files. The default is 10.

Command Default

By default, a maximum of 10 archive files of the running configuration are saved in the Cisco configuration archive.

Command Modes

Archive configuration (config-archive)

Command History

Release

Modification

12.3(7)T

This command was introduced.

12.2(25)S

This command was integrated into Cisco IOS Release 12.2(25)S.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(31)SB2

This command was implemented on the Cisco 10000 series.

12.2(33)SXH

This command was integrated into Cisco IOS Release 12.2(33)SXH.

12.2(33)SB

This command was integrated into Cisco IOS Release 12.2(33)SB and implemented on the Cisco 10000 series.

Cisco IOS XE Release 3.9S

This command was integrated into Cisco IOS XE Release 3.9S.

Usage Guidelines


Note


Before using this command, you must configure the path command to specify the location and filename prefix for the files in the Cisco configuration archive.


After the maximum number of files are saved in the Cisco configuration archive, the oldest file is automatically deleted when the next, most recent file is saved.


Note


This command should only be used when a local writable file system is specified in the url argument of the path command. Network file systems may not support deletion of previously saved files.


Examples

In the following example, a value of 5 is set as the maximum number of archive files of the running configuration to be saved in the Cisco configuration archive:

configure terminal
!
archive
 path disk0:myconfig
 maximum 5
 end

Related Commands

Command

Description

archive config

Saves a copy of the current running configuration to the Cisco configuration archive.

configure confirm

Confirms replacement of the current running configuration with a saved Cisco configuration file.

configure replace

Replaces the current running configuration with a saved Cisco configuration file.

path

Specifies the location and filename prefix for the files in the Cisco configuration archive.

show archive

Displays information about the files saved in the Cisco configuration archive.

time-period

Sets the time increment for automatically saving an archive file of the current running configuration in the Cisco configuration archive.

memory cache error-recovery

To trace error recovery in memory using caches, use the memory cache error-recoverycommand in global configuration mode. To disable the memory cache error recovery mechanisms, use the no form of this command.

memory cache error-recovery { L1 | L2 | L3 } { data | inst }

no memory cache error-recovery { L1 | L2 | L3 } { data | inst }

Syntax Description

L1

Specifies the L1 cache.

L2

Specifies the L2 cache.

L3

Specifies the L3 cache.

data

Specifies if data recovery is required.

inst

Specifies if instruction recovery is required.

Command Default

Memory cache error recovery mechanisms are not enabled.

Command Modes

Global configuration (config)

Command History

Release

Modification

15.0(1)M

This command was introduced in a release earlier than Cisco IOS Release 15.0(1)M.

12.2(33)SXI

This command was integrated into a release earlier than Cisco IOS Release 12.2(33)SXI.

Examples

The following example shows how to enable the memory cache error-recovery command:

Router> enable
Router# configure terminal
Router(config)# memory cache error-recovery

Related Commands

Command

Description

memory cache error-recovery options

Traces error recovery in memory using caches through set options.

memory cache error-recovery options

To trace error recovery in memory using caches through set options, use the memory cache error-recovery optionscommand in global configuration mode. To disable the set memory cache error recovery mechanisms, use the no form of this command.

memory cache error-recovery options { abort-if-same-content | blocking-mode | max-recoveries value | nvram-report | parity-check | window seconds }

no memory cache error-recovery options { abort-if-same-content | blocking-mode | max-recoveries value | nvram-report | parity-check | window seconds }

Syntax Description

abort-if-same-content

Abort recovery if the cache contains the same content as the memory.

blocking-mode

Sets the memory blocking mode to special or ON.

max-recoveries value

The maximum number of recoveries allowed within a time window. Specify a value in the range 0 to 255.

nvram-report

Saves the report in the NVRAM.

parity-check

Sets the parity checking mode to normal or ON.

window seconds

The time window, in seconds. Specify a value in the range 1 to 31536000.

Command Default

Memory cache error recovery mechanisms are not enabled.

Command Modes

Global configuration (config)

Command History

Release

Modification

15.0(1)M

This command was introduced in a release earlier than Cisco IOS Release 15.0(1)M.

12.2(33)SXI

This command was integrated into a release earlier than Cisco IOS Release 12.2(33)SXI.

Examples

The following example shows how to enable the memory cache error-recovery optionscommand:

Router> enable
Router# configure terminal
Router(config)# memory cache error-recovery options abort-if-same-content

Related Commands

Command

Description

memory cache error-recovery

Traces error recovery in memory using caches.

memory free low-watermark

To configure a router to issue system logging message notifications when available memory falls below a specified threshold, use the memory free low-watermarkcommand in global configuration mode. To disable memory threshold notifications, use the no form of this command.

memory free low-watermark { processor threshold | io threshold }

no memory free low-watermark

Syntax Description

processor threshold

Sets the processor memory threshold in kilobytes. When available processor memory falls below this threshold, a notification message is triggered. Valid values are 1 to 4294967295.

io threshold

Sets the input/output (I/O) memory threshold in kilobytes. When available I/O memory falls below this threshold, a notification message is triggered. Valid values are 1 to 4294967295.

Command Default

Memory threshold notifications are disabled.

Command Modes

Global configuration

Command History

Release

Modification

12.2(18)S

This command was introduced.

12.0(26)S

This command was integrated into Cisco IOS Release 12.0(26)S.

12.3(4)T

This command was integrated into Cisco IOS Release 12.3(4)T.

12.2(27)SBC

This command was integrated into Cisco IOS Release 12.2(27)SBC.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

Using this command, you can configure a router to issue a system logging message each time available free memory falls below a specified threshold (“low-watermark”). Once available free memory rises to 5 percent above the threshold, another notification message is generated.

Examples

The following example specifies a free processor memory notification threshold of 20000 KB:

Router(config)# memory free low-watermark processor 200000

If available free processor memory falls below this threshold, the router sends a notification message like this one:

000029: *Aug 12 22:31:19.559: %SYS-4-FREEMEMLOW: Free Memory has dropped below 20000k
Pool: Processor  Free: 66814056  freemem_lwm: 204800000

Once available free processor memory rises to a point 5 percent above the threshold, another notification message like this is sent:

000032: *Aug 12 22:33:29.411: %SYS-5-FREEMEMRECOVER: Free Memory has recovered 20000k
Pool: Processor  Free: 66813960  freemem_lwm: 0

Related Commands

Command

Description

memory reserve critical

Reserves memory for use by critical processes.

memory lite

To enable the memory allocation lite (malloc_lite) feature, use the memory lite command in global configuration mode. To disable this feature, use the no form of this command.

memory lite

no memory lite

Syntax Description

This command has no arguments or keywords.

Command Default

This command is enabled by default.

Command Modes

Global configuration

Command History

Release

Modification

12.3(11)T

This command was introduced.

Usage Guidelines

The malloc_lite feature was implemented to avoid excessive memory allocation overhead for situations where less than 128 bytes were required. This feature is supported for processor memory pools only.

The malloc_lite feature is enabled by default. If the malloc_lite feature is disabled using the no memory litecommand, you can re-enable the feature by entering the memory lite command.

Examples

The following example shows how to disable the malloc_lite feature:

no memory lite

Related Commands

Command

Description

scheduler heapcheck process

Performs a “sanity check” for corruption in memory blocks when a process switch occurs.

memory reserve

To reserve a specified amount of memory in kilobytes for console access and critical notifications, use the memory reserve command in global configuration mode. To disable the configuration, use the no form of this command.

Syntax for Releases 15.0(1)M and 12.2(33)SRC and Later Releases

memory reserve { console size | critical [total-size] }

no memory reserve { console | critical }

Syntax for Releases 12.2(33)SXI, Cisco IOS XE Release 2.1 and Later Releases

memory reserve critical [total-size]

no memory reserve critical

Syntax Description

console

Reserves the memory size for a console session.

size

Amount of memory to be reserved, in kilobytes. The range is from 0 to 4096.

critical

Reserves the memory for critical notifications.

total-size

(Optional) Total amount of memory to be reserved, in kilobytes. The range is from 0 to 4294967295.

Command Modes

Global configuration (config)

Command Default

256 KB is reserved for console memory access. 100 KB is reserved for cricial memory access.

Command History

Release

Modification

15.0(1)M

This command was introduced in a release earlier than Cisco IOS Release 15.0(1)M.

12.2(33)SRC

This command was integrated into a release earlier than Cisco IOS Release 12.2(33)SRC.

12.2(33)SXI

This command was integrated into a release earlier than Cisco IOS Release 12.2(33)SXI.

Cisco IOS XE Release 2.1

This command was implemented on the Cisco ASR 1000 Series Aggregation Services Routers.

Usage Guidelines

The memory reserve console command reserves enough memory to ensure console access to a Cisco IOS device for administrative and troubleshooting purposes. This feature is especially beneficial when the device runs low on memory.

The memory reserve critical command reserves the specified amount of memory in kilobytes so that the router can issue critical notifications. The amount of memory reserved for critical notifications cannot exceed 25 percent of the total available memory.

Examples

The following example shows how to reserve a specified amount of memory in kilobytes for console access:

Router# configure terminal
Router(config)# memory reserve console 2

Related Commands

Command

Description

memory free low-watermark

Configures a router to issue system logging message notifications when available memory falls below a specified threshold.

memory reserve critical


Note


Effective with Cisco IOS Release 12.4(15)T1, the memory reserve critical command is replaced by the memory reserve command. See the memory reserve command for more information.


To configure the size of the memory region to be used for critical notifications (system logging messages), use the memory reserve criticalcommand in global configuration mode. To disable the reservation of memory for critical notifications, use the no form of this command.

memory reserve critical kilobytes

no memory reserve critical

Syntax Description

kilobytes

Specifies the amount of memory to be reserved in kilobytes. Valid values are 1 to 4294967295, but the value you specify cannot exceed 25 percent of total memory. The default is 100 kilobytes.

Command Default

100 kilobytes of memory is reserved for the logging process.

Command Modes

Global configuration (config)

Command History

Release

Modification

12.2(18)S

This command was introduced.

12.0(26)S

This command was integrated into Cisco IOS Release 12.0(26)S.

12.3(4)T

This command was integrated into Cisco IOS Release 12.3(4)T.

12.2(27)SBC

This command was integrated into Cisco IOS Release 12.2(27)SBC.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.4(15)T1

This command was replaced by the memory reserve command.

Usage Guidelines

This command reserves a region of memory on the router so that, when system resources are overloaded, the router retains enough memory to issue critical system logging messages.


Note


Once the size of the reserved memory region is specified, any change to the specified value takes effect only after the current configuration is saved and the system has been reloaded.


Examples

The following example shows how to reserve 1,000 KB of system memory for logging messages at the next system restart:

Router(config)# memory reserve critical 1000

Related Commands

Command

Description

memory free low-watermark

Configures a router to issue syslog notifications when available memory falls below a specified threshold.

memory sanity

To perform a “sanity check” for corruption in buffers and queues, use the memory sanity command in global configuration mode. To disable this feature, use the no form of this command.

memory sanity [ buffer | queue | all ]

no memory sanity

Syntax Description

buffer

(Optional) Specifies checking all buffers.

queue

(Optional) Specifies checking all queues.

all

(Optional) Specifies checking all buffers and queues.

Command Default

This command is not enabled by default. If the buffer or queue keyword is not specified, a sanity check will be performed on all buffers and queues.

Command Modes

Global configuration

Command History

Release

Modification

12.2(15)T

This command was introduced.

Usage Guidelines

When the memory sanity buffer command is enabled, a sanity check is performed on buffers when a packet buffer is allocated or when a packet buffer is returned to the buffer pool. This command also time-stamps the buffer, which may be useful when tracking the age of a buffer.

The memory sanity command can be saved in the startup configuration file and, therefore, it is not necessary to reconfigure this command each time the router is reloaded. Like the scheduler heapcheck process memory command, the memory sanity command can check for corruption in the I/O memory block.

Enabling the memory sanity command may result in slight router performance degradation.

Examples

The following example shows how to perform a sanity check for corruption in all buffers and queues:

memory sanity all

Related Commands

Command

Description

scheduler heapcheck process memory

Performs a “sanity check” for corruption in memory blocks when a process switch occurs.

memory scan

To enable the Memory Scan feature, use the memory scan command in global configuration mode. To restore the router configuration to the default, use the no form of this command.

memory scan

no memory scan

Syntax Description

This command has no arguments or keywords.

Command Default

This command is disabled by default.

Command Modes

Global configuration

Command History

Release

Modification

12.0(4)XE

This command was introduced.

12.0(7)T

This command was integrated in Cisco IOS Release 12.0 T for the Cisco 7500 series only.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

The Memory Scan feature adds a low-priority background process that searches all installed dynamic random-access memory (DRAM) for possible parity errors. If errors are found in memory areas that are not in use, this feature attempts to scrub (remove) the errors. The time to complete one memory scan and scrub cycle can range from 10 minutes to several hours, depending on the amount of installed memory. The impact of the Memory Scan feature on the central processing unit (CPU) is minimal. To view the status of the memory scan feature on your router, use the show memory scan command in EXEC mode.

Examples

The following example enables the Memory Scan feature on a Cisco 7500 series router:

Router(config)# memory scan

Related Commands

Command

Description

show memory scan

Displays the number and type of parity errors on your system.

memory-size iomem

To reallocate the percentage of DRAM to use for I/O memory and processor memory, use the memory-size iomem command in global configuration mode. To revert to the default memory allocation, use the no form of this command.

memory-size iomem i/o-memory-percentage

no memory-size iomem

Syntax Description

i/o-memory-percentage

The percentage of DRAM allocated to I/O memory, in bytes. The values permitted are 5, 10, 15, 20, 25, 30, 40, and 50 . A minimum of 4 MB of memory is required for I/O memory.

Command Default

The default memory allocation is 25 percent of the DRAM to I/O memory and 75 percent of the DRAM to processor memory.


Note


If thesmartinitprocess has been enabled, the default memory allocation of 25 percent to the I/O memory does not apply. Instead, smartinitexamines the network modules, and then calculates the memory allocation for the I/O memory.


Command Modes

Global configuration (config)

Command History

Release

Modification

11.2 P

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.4(15)T1

This command was integrated into Cisco IOS Release 12.4(15)T1.

Usage Guidelines

When you specify the percentage of I/O memory in the command line, the processor memory automatically acquires the remaining percentage of the DRAM memory.

Examples

The following example allocates 40 percent of the DRAM memory to I/O memory and the remaining 60 percent to the processor memory:

Router# 
configure terminal
Router(config)# 
memory-size iomem 40
Smart-init will be disabled and new I/O memory size will take effect upon reload.

menu (EXEC)

To display a preconfigured user menu, use the menu command in user EXEC or privileged EXEC mode.

menu menu-name

Syntax Description

menu-name

The name of the menu.

Command Modes

User EXEC

Privileged EXEC

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

A user menu is a type of user interface where text descriptions of actions to be performed are displayed to the user. The user can use the menu to select services and functions without having to know the details of command-line interface (CLI) commands.

Menus can be created for users in global configuration mode, using the commands listed in the “Related Commands” section.

A menu can be invoked at either the user or privileged EXEC level, but if an item in the menu contains a privileged EXEC command, the user must be logged in at the privileged level for the command to succeed.

Examples

The following example invokes a menu named OnRamp:

Router> menu OnRamp
      Welcome to OnRamp Internet Services
                                
       Type a number to select an option;
            Type 9 to exit the menu.
1     Read email
2     UNIX Internet access
3     Resume UNIX connection
6     Resume next connection
9     Exit menu system

Related Commands

Command

Description

menu clear-screen

Clears the terminal screen before displaying a menu.

menu command

Specifies underlying commands for user interface menus.

menu default

Specifies the menu item to use as the default.

menu line-mode

Requires the user to press Enter after specifying an option number.

menu options

Sets options for items in user interface menus.

menu prompt

Specifies the prompt for a user interface menu.

menu single-space

Displays menu items single-spaced rather than double-spaced.

menu status-line

Displays a line of status information about the current user at the top of a menu.

menu text

Specifies the text of a menu item in a user interface menu.

menu title

Creates a title, or banner, for a user menu.

no menu

Deletes a specified menu from a menu configuration.

menu menu-name single-space

To display menu items single-spaced rather than double-spaced, use the menu <menu-name> single-space command in global configuration mode.

menu menu-name single-space

Syntax Description

menu-name

Name of the menu this command should be applied to.

Command Default

Enabled for menus with more than nine items; disabled for menus with nine or fewer items.

Command Modes

Global configuration

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

When more than nine menu items are defined, the menu is displayed single-spaced. To configure the menus with nine or fewer items to display single-spaced, use this command.

Examples

In the following example, single-spaced menu items are displayed for the menu named Access1:

menu Access1 single-space

Related Commands

Command

Description

menu (EXEC)

Invokes a user menu.

menu clear-screen

Clears the terminal screen before displaying a menu.

menu command

Specifies underlying commands for user menus.

menu default

Specifies the menu item to use as the default.

menu line-mode

Requires the user to press Enter after specifying an item.

menu options

Sets options for items in user menus.

menu prompt

Specifies the prompt for a user menu.

menu status-line

Displays a line of status information about the current user at the top of a menu.

menu text

Specifies the text of a menu item in a user menu.

menu title

Creates a title, or banner, for a user menu.

menu clear-screen

To clear the terminal screen before displaying a menu, use the menu clear-screen command in global configuration mode.

menu clear-screen menu-name clear-screen

Syntax Description

menu-name

Name of the menu this command should be applied to.

Command Default

Disabled

Command Modes

Global configuration

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

This command uses a terminal-independent mechanism based on termcap entries defined in the router and the configured terminal type for the user. This command allows the same menu to be used on multiple types of terminals instead of having terminal-specific strings embedded within menu titles. If the termcap entry does not contain a clear string, the menu system enters 24 new lines, causing all existing text to scroll off the top of the terminal screen.

Examples

In the following example, the terminal screen is cleared before displaying the menu named Access1:

Router(config)# menu Access1 clear-screen

Related Commands

Command

Description

menu (EXEC)

Invokes a user menu.

menu command

Specifies underlying commands for user menus.

menu default

Specifies the menu item to use as the default.

menu line-mode

Requires the user to press Enter after specifying an item.

menu options

Sets options for items in user menus.

menu prompt

Specifies the prompt for a user menu.

menu single-space

Displays menu items single-spaced rather than double-spaced.

menu status-line

Displays a line of status information about the current user at the top of a menu

menu text

Specifies the text of a menu item in a user menu.

menu title

Creates a title, or banner, for a user menu.

no menu

Deletes a specified menu from a menu configuration.

menu command

To specify underlying commands for user menus, use the menu command command in global configuration mode.

menu command menu menu-name command menu-item { command | menu-exit }

Syntax Description

menu-name

Name of the menu. You can specify a maximum of 20 characters.

menu-item

Number, character, or string used as the key for the item. The key is displayed to the left of the menu item text. You can specify a maximum of 18 menu entries. When the tenth item is added to the menu, the line-mode and single-space options are activated automatically.

command

Command to issue when the user selects an item.

menu-exit

Provides a way for menu users to return to a higher-level menu or exit the menu system.

Command Default

Disabled

Command Modes

Global configuration

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

Use this command to assign actions to items in a menu. Use the menu text global configuration command to assign text to items. These commands must use the same menu name and menu selection key.

The menu command command has a special keyword for the command argument, menu-exit, that is available only within menus. It is used to exit a submenu and return to the previous menu level, or to exit the menu altogether and return to the EXEC command prompt.

You can create submenus that are opened by selecting entries in another menu. Use the menu EXEC command as the command for the submenu item.


Note


If you nest too many levels of menus, the system prints an error message on the terminal and returns to the previous menu level.


When a menu allows connections (their normal use), the command for an entry activating the connection should contain a resume command, or the line should be configured to prevent users from escaping their sessions with the escape-char none command. Otherwise, when they escape from a connection and return to the menu, there will be no way to resume the session and it will sit idle until the user logs out.

Specifying the resume command as the action that is performed for a selected menu entry permits a user to resume a named connection or connect using the specified name, if there is no active connection by that name. As an option, you can also supply the connect string needed to connect initially. When you do not supply this connect string, the command uses the specified connection name.

You can also use the resume/next command, which resumes the next connection in the user’s list of connections. This function allows you to create a single menu entry that steps through all of the user’s connections.


Note


A menu should not contain any exit paths that leave users in an unfamiliar interface environment.


When a particular line should always display a menu, that line can be configured with an autocommand line configuration command. Menus can be run on a per-user basis by defining a similar autocommandcommand for that local username. For more information about the autocommand command, refer to the Cisco IOS Dial Technologies Configuration Guide.


Note


The maximum number of menu commands that the device supports is 66.

Examples

In the following example, the commands to be issued when the menu user selects option 1, 2, or 3 are specified for the menu named Access1:

menu Access1 command 1 tn3270 vms.cisco.com
menu Access1 command 2 rlogin unix.cisco.com
menu Access1 command 3 menu-exit

The following example allows a menu user to exit a menu by entering Exit at the menu prompt:

menu Access1 text Exit Exit

menu Access1 command Exit menu-exit

Related Commands

Command

Description

autocommand

Configures the Cisco IOS software to automatically execute a command when a user connects to a particular line.

menu (EXEC)

Invokes a user menu.

menu clear-screen

Clears the terminal screen before displaying a menu.

menu default

Specifies the menu item to use as the default.

menu line-mode

Requires the user to press Enter after specifying an item.

menu options

Sets options for items in user menus.

menu prompt

Specifies the prompt for a user menu.

menu single-space

Displays menu items single-spaced rather than double-spaced.

menu status-line

Displays a line of status information about the current user at the top of a menu

menu text

Specifies the text of a menu item in a user menu.

menu title

Creates a title, or banner, for a user menu.

menu default

To specify the menu item to use as the default, use the menu default command in global configuration mode.

menu menu-name default menu-item

Syntax Description

menu-name

Name of the menu. You can specify a maximum of 20 characters.

menu-item

Number, character, or string key of the item to use as the default.

Command Default

Disabled

Command Modes

Global configuration

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

Use this command to specify which menu entry is used when the user presses Enter without specifying an item. The menu entries are defined by the menu command and menu text global configuration commands.

Examples

In the following example, the menu user exits the menu when pressing Enter without selecting an item:

menu Access1 9 text Exit the menu
menu Access1 9 command menu-exit
menu Access1 default 
9

Related Commands

Command

Description

menu (EXEC)

Invokes a preconfigured user menu.

menu command

Specifies underlying commands for user menus.

menu prompt

Specifies the prompt for a user menu.

menu text

Specifies the text of a menu item in a user menu.

menu title

Creates a title, or banner, for a user menu.

menu line-mode

To require the user to press Enter after specifying an item, use the menu line-mode command in global configuration mode.

menu menu-name line-mode

Syntax Description

menu-name

Name of the menu this command should be applied to.

Command Default

Enabled for menus with more than nine items. Disabled for menus with nine or fewer items.

Command Modes

Global configuration

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

In a menu of nine or fewer items, you ordinarily select a menu item by entering the item number. In line mode, you select a menu entry by entering the item number and pressing Enter. Line mode allows you to backspace over the selected number and enter another number before pressing Enter to issue the command.

This option is activated automatically when more than nine menu items are defined but also can be configured explicitly for menus of nine or fewer items.

In order to use strings as keys for items, the menu line-mode command must be configured.

Examples

In the following example, the line-mode option is enabled for the menu named Access1:

menu Access1 line-mode

Related Commands

Command

Description

menu (EXEC)

Invokes a preconfigured user menu.

menu clear-screen

Clears the terminal screen before displaying a menu.

menu command

Specifies underlying commands for a user menu.

menu default

Specifies the menu item to use as the default.

menu options

Sets options for items in user menus.

menu prompt

Specifies the prompt for a user menu.

menu single-space

Displays menu items single-spaced rather than double-spaced.

menu status-line

Displays a line of status information about the current user at the top of a menu.

menu text

Specifies the text of a menu item in a user menu.

menu options

To set options for items in user menus, use the menu options command in global configuration mode.

Cisco IOS Release 10.0, 12.2(33)SRA, 12.2(33)SXI , and Later Releases

menu menu-name options menu-item [login] [pause]

Cisco IOS XE Release 3.1S and Later Releases

menu menu-name options menu-item { login | pause }

Syntax Description

menu-name

The name of the menu. You can specify a maximum of 20 characters.

menu-item

Number, character, or string key of the item affected by the option.

login

(Optional) Configures the router to request a login before issuing the command.

pause

(Optional) Configures the router to pause after issuing the command and before redrawing the menu.

Command Default

The menu options are disabled.

Command Modes

Global configuration (config)

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(33)SXI

This command was integrated into a release earlier than Cisco IOS Release 12.2(33)SXI.

Cisco IOS XE Release 3.1S

This command was integrated into a release earlier than Cisco IOS Release 3.1S.

Usage Guidelines

Use the menu command and menu text commands to define a menu entry.

Examples

The following example shows how to configure the router to request a login before issuing the command specified by menu entry 3 of the menu named Access1:

Router(config)# 
menu Access1 options 3 login

Related Commands

Command

Description

menu (EXEC)

Invokes a user menu.

menu clear-screen

Clears the terminal screen before displaying a menu.

menu command

Specifies underlying commands for user menus.

menu default

Specifies the menu item to use as the default.

menu line-mode

Requires the user to press Enter after specifying an item.

menu prompt

Specifies the prompt for a user menu.

menu single-space

Displays menu items single-spaced rather than double-spaced.

menu status-line

Displays a line of status information about the current user at the top of a menu.

menu text

Specifies the text of a menu item in a user menu.

menu title

Creates a title, or banner, for a user menu.

menu prompt

To specify the prompt for a user menu, use the menu prompt command in global configuration mode.

menu menu-name prompt d prompt d

Syntax Description

menu-name

Name of the menu. You can specify a maximum of 20 characters.

d

A delimiting character that marks the beginning and end of a title. Text delimiters are characters that do not ordinarily appear within the text of a title, such as slash ( / ), double quote ("), and tilde (~). ^C is reserved for special use and should not be used in the text of the title.

prompt

Prompt string for the menu.

Command Default

Disabled

Command Modes

Global configuration

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

Press Enter after entering the first delimiter. The router will prompt you for the text of the prompt. Enter the text followed by the delimiter, and press Enter.

Use the menu command and menu text commands to define the menu selections.

Examples

In the following example, the prompt for the menu named Access1 is configured as “Select an item.”:

Router(config)# menu Access1 prompt /
Enter TEXT message.  End with the character '/'.
Select an item. /
Router(config)#

Related Commands

Command

Description

menu (EXEC)

Invokes a user menu.

menu command

Specifies underlying commands for user menus.

menu default

Specifies the menu item to use as the default.

menu text

Specifies the text of a menu item in a user menu.

menu title

Creates a title, or banner, for a user menu.

menu status-line

To display a line of status information about the current user at the top of a menu, use the menu status-line command in global configuration mode.

menu menu-name status-line

Syntax Description

menu-name

Name of the menu this command should be applied to.

Command Default

Disabled

Command Modes

Global configuration

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

This command displays the status information at the top of the screen before the menu title is displayed. This status line includes the router’s host name, the user’s line number, and the current terminal type and keymap type (if any).

Examples

In the following example, status information is enabled for the menu named Access1:

menu Access1 status-line

Related Commands

Command

Description

menu (EXEC)

Invokes a user menu.

menu clear-screen

Clears the terminal screen before displaying a menu.

menu command

Specifies underlying commands for user menus.

menu default

Specifies the menu item to use as the default.

menu line-mode

Requires the user to press Enter after specifying an item in a menu.

menu options

Sets options for items in user menus.

menu prompt

Specifies the prompt for a user menu.

menu single-space

Displays menu items single-spaced rather than double-spaced.

menu text

Specifies the text of a menu item in a user menu.

menu title

Creates a title, or banner, for a user menu.

menu text

To specify th e text of a menu item in a user menu, use the menu text command in global configuration mode.

menu menu-name text menu-item menu-text

Syntax Description

menu-name

Name of the menu. You can specify a maximum of 20 characters.

menu-item

Number, character, or string used as the key for the item. The key is displayed to the left of the menu item text. You can specify a maximum of 18 menu items. When the tenth item is added to the menu, the menu line-mode and menu single-space commands are activated automatically.

menu-text

Text of the menu item.

Command Default

No text appears for the menu item.

Command Modes

Global configuration

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

Use this command to assign text to items in a menu. Use the menu command command to assign actions to items. These commands must use the same menu name and menu selection key.

You can specify a maximum of 18 items in a menu.

Examples

In the following example, the descriptive text for the three entries is specified for options 1, 2, and 3 in the menu named Access1:

menu Access1 text 1 IBM Information Systems
menu Access1 text 2 UNIX Internet Access
menu Access1 text 3 Exit menu system

Related Commands

Command

Description

menu (EXEC)

Invokes a user menu.

menu clear-screen

Clears the terminal screen before displaying a menu.

menu command

Specifies underlying commands for user menus.

menu default

Specifies the menu item to use as the default.

menu line-mode

Requires the user to press Enter after specifying an item.

menu options

Sets options for items in user menus.

menu prompt

Specifies the prompt for a user menu.

menu single-space

Displays menu items single-spaced rather than double-spaced.

menu status-line

Displays a line of status information about the current user at the top of a menu.

menu title

Creates a title, or banner, for a user menu.

menu title

To create a t itle (banner) for a user menu, use the menu title command in global configuration mode.

menu menu-name title d menu-title d

Syntax Description

menu-name

Name of the menu. You can specify a maximum of 20 characters.

d

A delimiting character that marks the beginning and end of a title. Text delimiters are characters that do not ordinarily appear within the text of a title, such as slash ( / ), double quote ("), and tilde (~). ^C is reserved for special use and should not be used in the text of the title.

menu-title

Lines of text to appear at the top of the menu.

Command Default

The menu does not have a title.

Command Modes

Global configuration

Command History

Release

Modification

10.0

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

The menu title command must use the same menu name used with the menu text and menu command commands used to create a menu.

You can position the title of the menu horizontally by preceding the title text with blank characters. You can also add lines of space above and below the title by pressing Enter.

Follow the title keyword with one or more blank characters and a delimiting character of your choice. Then enter one or more lines of text, ending the title with the same delimiting character. You cannot use the delimiting character within the text of the message.

When you are configuring from a terminal and are attempting to include special control characters, such as a screen-clearing string, you must use Ctrl-V before the special control characters so that they are accepted as part of the title string. The string ^[[H^[[J is an escape string used by many VT100-compatible terminals to clear the screen. To use a special string, you must enter Ctrl-V before each escape character.

You also can use the menu clear-screen global configuration command to clear the screen before displaying menus and submenus, instead of embedding a terminal-specific string in the menu title. The menu clear-screen command allows the same menu to be used on different types of terminals.

Examples

In the following example, the title that will be displayed is specified when the menu named Access1 is invoked. Press Enter after the second slash (/) to display the prompt.

Router(config)# menu Access1 title /^[[H^[[J
Enter TEXT message.  End with the character '/'.
               Welcome to Access1 Internet Services
               
                  Type a number to select an option;
                           Type 9 to exit the menu.
/
Router(config)# 

Related Commands

Command

Description

menu (EXEC)

Invokes a user menu.

menu clear-screen

Clears the terminal screen before displaying a menu.

menu command

Specifies underlying commands for user menus.

menu default

Specifies the menu item to use as the default.

menu line-mode

Requires the user to press Enter after specifying an item.

menu options

Sets options for items in user menus.

menu prompt

Specifies the prompt for a user menu.

menu single-space

Displays menu items single-spaced rather than double-spaced.

menu status-line

Displays a line of status information about the current user at the top of a menu.

menu text

Specifies the text of a menu item in a user menu.

microcode (12000)

To load a Cisco IOS software image on a line card from Flash memory or the GRP card on a Cisco 12000 series Gigabit Switch Router (GSR), use the microcode command in global configuration mode. To load the microcode bundled with the GRP system image, use the no form of this command.

microcode { oc12-atm | oc12-pos | oc3-pos4 } { flash file-id [slot] | system [slot] }

no microcode { oc12-atm | oc12-pos | oc3-pos4 } [ flash file-id [slot] | system [slot] ]

Syntax Description

oc12-atm | oc12-pos | oc3-pos4

Interface name.

flash

Loads the image from the Flash file system.

file-id

Specifies the device and filename of the image file to download from Flash memory. A colon (:) must separate the device and filename (for example, slot0:gsr-p-mz). Valid devices include:

  • bootflash: --Internal Flash memory.
  • slot0: --First PCMCIA slot.
  • slot1: --Second PCMCIA slot.

slot

(Optional) Slot number of the line card that you want to copy the software image to. Slot numbers range from 0 to 11 for the Cisco 12012 router and 0 to 7 for the Cisco 12008 router. If you do not specify a slot number, the Cisco IOS software image is downloaded on all line cards.

system

Loads the image from the software image on the GRP card.

Command Default

The default is to load the image from the GRP card (system).

Command Modes

Global configuration

Command History

Release

Modification

11.2 GS

This command was introduced for Cisco 12000 series GSRs.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

In addition to the Cisco IOS image that resides on the GRP card, each line card on a Cisco 12000 series has a Cisco IOS image. When the router is reloaded, the specified image is loaded onto the GRP card and then automatically downloaded to all the line cards.

Normally, you want the same Cisco IOS image on the GRP card and all line cards. However, if you want to upgrade a line card with a new version of microcode for testing or to fix a defect, you might need to load a Cisco IOS image that is different from the one on the line card. Additionally, you might need to load a new image on the line card to work around a problem that is affecting only one of the line cards.

To load a Cisco IOS image on a line card, first use the copy tftp command to download the Cisco IOS image to a slot on one of the PCMCIA Flash memory cards. Then use the microcode command to download the image to the line card, followed by the microcode reload command to start the image. Immediately after you enter the microcode reload command and press Return, the system reloads all microcode. Global configuration mode remains enabled. After the reloading is complete, enter the exit command to return to the EXEC system prompt.

To verify that the correct image is running on the line card, use the execute-on slot slot show version command.

For additional information on GSR configuration, refer to the documentation specific to your Cisco IOS software release.

Examples

In the following example, the Cisco IOS software image in slot 0 is downloaded to the line card in slot 10. This software image is used when the system is booted, a line card is inserted or removed, or the microcode reloadglobal configuration command is issued.

Router(config)# microcode oc3-POS-4 flash slot0:fip.v141-7 10
 
Router(config)# microcode reload 10

In this example, the user would issue the execute-on slot 10 show version command to verify that the correct version is loaded.

Related Commands

Command

Description

microcode reload (12000)

Reloads microcode on Cisco 12000 series GSRs.

microcode (7000/7500)

To specify the location of the microcode that you want to download from Flash memory into the writable control store (WCS) on Cisco 7000 series (including RSP based routers) or Cisco 7500 series routers, use the microcode command in global configuration mode. To load the microcode bundled with the system image, use the no form of this command.

microcode interface-type { flash-filesystem:filename [slot] | rom | system [slot] }

no microcode interface-type { flash-filesystem:filename [slot] | rom | system [slot] }

Syntax Description

interface-type

One of the following interface processor names: aip, cip, eip, feip, fip, fsip, hip, mip, sip, sp, ssp, trip, vip, or vip2

flash-filesystem :

Flash file system, followed by a colon . Valid file systems are bootflash, slot0, and slot1

Slave devices such as slaveslot0 are invalid. The slave’s file system is not available during microcode reloads.

filename

Name of the microcode file.

slot

(Optional) Number of the slot. Range is from 0 to 15.

rom

If ROM is specified, the router loads from the onboard ROM microcode.

system

If the system keyword is specified, the router loads the microcode from the microcode bundled into the system image you are running for that interface type.

Command Default

The default is to load from the microcode bundled in the system image.

Command Modes

Global configuration

Command History

Release

Modification

10.3

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

If you do not use the microcode reload command after using the microcode command, the microcode reload command will be written to the configuration file automatically.

When using Dual RSPs for simple hardware backup, ensure that the master and slave RSP card contain the same microcode image in the same location when the router is to load the interface processor microcode from a Flash file system. Thus, if the slave RSP becomes the master, it will be able to find the microcode image and download it to the interface processor.

Examples

In the following example, all FIP cards will be loaded with the microcode found in Flash memoryfile fip.v141-7 when the system is booted, when a card is inserted or removed, or when the microcode reloadglobal configuration command is issued. The configuration is then written to the startup configuration file.

Router(config)# 
microcode fip slot0:fip.v141-7
Router(config)# end
Router# copy system:running-config nvram:startup-config

Related Commands

Command

Description

more flh:logfile

Displays the system console output generated during the Flash load helper operation.

microcode (7200)

To configure a default override for the microcode that is downloaded to the hardware on a Cisco 7200 series router, use the microcode command in global configuration mode. To revert to the default microcode for the current running version of the Cisco IOS software, use the no form of this command.

microcode { ecpa | pcpa } location

no microcode { ecpa | pcpa }

Syntax Description

ecpa

ESCON Channel Port Adapter (CPA) interface.

pcpa

Parallel CPA interface.

location

Location of microcode, including the device and filename.

Command Default

If the default or noform of the command is specified, the driver uses the default microcode for the current running version of the Cisco IOS software.

Command Modes

Global configuration

Command History

Release

Modification

11.3(3)T

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

If there are any default overrides when the configuration is written, then the microcode reload command will be written to the configuration automatically. This action enables the configured microcode to be downloaded at system startup.

The CPA microcode image is preloaded on Flash memory cards for Cisco 7200-series routers for Cisco IOS Release 11.3(3)T and later releases. You may be required to copy a new image to Flash memory when a new microcode image becomes available.

For more information on the CPA configuration and maintenance, refer to the “Configuring Cisco Mainframe Channel Connection Adapters” chapter in the Release 12.2 Cisco IOS Bridging and IBM Networking Configuration Guide.

Examples

The following example instructs the Cisco IOS software to load the microcode from an individual microcode image that is stored as a file on the Flash card inserted in Flash card slot 0:

microcode ecpa slot0:xcpa26-1 

Related Commands

Command

Description

microcode reload (7200)

Resets and reloads the specified hardware in a Cisco 7200 series router.

show microcode

Displays microcode information.

microcode reload (12000)

To reload the Cisco IOS image from a line card on Cisco 12000 series routers, use the microcode reload command in global configuration mode.

microcode reload [slot-number]

Syntax Description

slot-number

(Optional) Slot number of the line card that you want to reload the Cisco IOS software image on. Slot numbers range from 0 to 11 for the Cisco 12012 and from 0 to 7 for the Cisco 12008 router. If you do not specify a slot number, the Cisco IOS software image is reloaded on all line cards.

Command Modes

Global configuration

Command History

Release

Modification

11.2 GS

This command was introduced for Cisco 12000 series GSRs.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

In addition to the Cisco IOS image that resides on the GRP card, each line card on Cisco 12000 series routers has a Cisco IOS image. When the router is reloaded, the specified Cisco IOS image is loaded onto the GRP card and automatically downloaded to all the line cards.

Normally, you want the same Cisco IOS image on the GRP card and all line cards. However, if you want to upgrade a line card with a new version of microcode for testing or to fix a defect, you might need to load a different Cisco IOS image. Additionally, you might need to load a new image on the line card to work around a problem affecting only one of the line cards.

To load a Cisco IOS image on a line card, first use the copy tftp command to download the Cisco IOS image to a slot on one of the PCMCIA Flash memory cards. Then use the microcode command to download the image to the line card, followed by the microcode reload command to start the image. To verify that the correct image is running on the line card, use the execute-on slot slot show version command.

For additional information on GSR configuration, refer to the “Observing System Startup and Performing a Basic Configuration” chapter in the Cisco 12000 series installation and configuration guides.

The microcode reload (12000) command allows you to issue another command immediately.


Note


Issuing a microcode reload command on any of the line cards in a Cisco 12000 GSR immediately returns the console command prompt. This allows you to issue a subsequent command immediately to the reloading line card. However, any commands entered at this time will not execute, and often no indication will be given that such a command failed to run. Verify that the microcode has reloaded before issuing new commands.


Examples

In the following example, the mirocode firmware is reloaded on the line card in slot 10:

Router(config)# microcode reload 10
 

Related Commands

Command

Description

microcode (12000)

Loads a Cisco IOS software image on a line card from Flash memory or the GRP card on a Cisco 12000 series GSR.

microcode reload (7000 7500)

To reload the processor card on the Cisco 7000 series with RSP7000 or Cisco 7500 series routers, use the microcode reload command in global configuration mode.

microcode reload [slot-number]

Syntax Description

slot-number

(Optional) Reloads the specified processor card slot on a Cisco 7500 series router.

Command Default

No default behaviors or values.

Command Modes

Global configuration

Command History

Release

Modification

10.3

This command was introduced for Cisco 7500 series routers.

12.3(8)T

The slot-number argument was added for Cisco 7500 series routers.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

This command reloads the microcode without rebooting the router. Immediately after you enter the microcode reload command, the system reloads all microcode. Global configuration mode remains enabled.


Note


If you modify the system configuration to load a microcode image, the microcode reload command will be written to the configuration file automatically following the use of a microcode command. This action enables the configured microcode to be downloaded at system startup.


Examples

In the following example, all controllers are reset, and the microcode specified in the current configuration is loaded:

Router(config)# microcode reload

Related Commands

Command

Description

microcode (7000/7500)

Specifies the location from where microcode should be loaded when the microcode reload command is processed on RSP-based routers.

microcode reload (7200)

To reload the Cisco IOS microcode image on an ESCON CPA card in the Cisco 7200 series router, use the microcode reload command in privileged EXEC mode.

microcode reload { all | ecpa [ slot slot-number ] | pcpa [ slot slot-number ] }

Syntax Description

all

Resets and reloads all hardware types that support downloadable microcode.

ecpa

Resets and reloads only those slots that contain hardware type ecpa.

pcpa

Resets and reloads only those slots that contain hardware type pcpa.

slot slot-number

(Optional) Resets and reloads only the slot specified, and only if it contains the hardware specified.

Command Modes

Privileged EXEC

Command History

Release

Modification

11.3(3)T

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

Hardware types that do not support downloadable microcode are unaffected by the microcode reload all command.

You will be prompted for confirmation before the microcode reloadcommand is executed.

Examples

The following example reloads the ESCON CPA microcode in slot 5 with the currently configured microcode:

Router# microcode reload ecpa slot 5
 

Related Commands

Command

Description

microcode (7200)

Configures a default override for the microcode that is downloaded to the hardware on a Cisco 7200 series router.

show microcode

Displays the microcode bundled into a Cisco 7000 series with RSP7000, Cisco 7200 series, or Cisco 7500 series router.

mkdir

To create a new directory in a Class C flash file system, use the mkdir command in user EXEC, privileged EXEC, or diagnostic mode.

mkdir directory

Syntax Description

directory

The name of the directory to create.

Command Modes

User EXEC (>) Privileged EXEC (#) Diagnostic (diag)

Command History

Release

Modification

11.3AA

This command was introduced.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Cisco IOS XE Release 2.1

This command was modified and implemented on the Cisco ASR 1000 Aggregation Services Routers. The following enhancements were made:

  • This command was introduced in diagnostic mode. The command can be entered in both privileged EXEC and diagnostic mode on the Cisco ASR 1000 Series Routers.
  • The harddisk:, obfl:, stby-harddisk:, stby-nvram:, stby-obfl:, stby-usb[0-1]:,and usb[0-1]: directory options were added.

Usage Guidelines

This command is valid only on Class C flash file systems.

When executing the mkdir directory command on a USB token device, you can create only two levels of subdirectories under a directory. A new directory (third level directory) cannot be created on the USB token, but you can copy files to the existing subdirectories.

Examples

The following example creates a directory named newdir:

Router# mkdir newdir
Mkdir file name [newdir]?
Created dir flash:newdir
Router# dir
Directory of flash:
  2  drwx           0   Mar 13 1993 13:16:21  newdir
8128000 bytes total (8126976 bytes free)

Related Commands

Command

Description

dir

Displays a list of files on a file system.

rmdir

Removes an existing directory in a Class C flash file system.

mkdir disk0:

To create a new directory in a Flash file system, use the mkdir disk0:command.

mkdir disk0:

Syntax Description

This command has no arguments or keywords.

Command Default

This command has no default settings.

Command Modes

EXEC

Command History

Release

Modification

12.2(14)SX

Support for this command was introduced on the Supervisor Engine 720.

12.2(17d)SXB

Support for this command on the Supervisor Engine 2 was extended to the 12.2 SX release.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

Usage Guidelines

This command is valid only on Flash file systems.

After you enter the mkdir disk0: command, you are prompted to enter the new directory filename.

To check your entry, enter the dir command.

To remove a directory, enter the rmdir command.

Examples

This example shows how to create a directory named newdir:

Router# mkdir disk0:
Create directory filename [ ]? newdir
Created dir disk0: newdir
Router# 

Related Commands

Command

Description

cd

Changes the default directory or file system.

dir

Displays a list of files on a file system.

rmdir

Removes an existing directory in a Class C Flash file system.

mode

To set the redundancy mode, use the mode command in redundancy configuration mode.

Syntax for 12.2S Release

mode { rpr | rpr-plus | sso }

Syntax for Cisco IOS XE Release 2.5 and Later Releases

mode { rpr | sso }

Syntax for 12.2XNE Release

mode sso

Syntax Description

rpr

Specifies Route Processor Redundancy (RPR) mode.

rpr-plus

Specifies Route Processor Redundancy Plus (RPR+) mode.

sso

Specifies stateful switchover (SSO) mode.

Cisco 7600 Series Routers That Are Configured with a Supervisor Engine 720

  • The default is SSO mode if the system is not configured for redundancy and the active and standby supervisor engines have the same image.
  • The default is RPR mode if different versions are installed.
  • If redundancy is enabled, the default is the mode that you have configured.
  • The default is RPR+ mode if the system is not configured for redundancy and the active and standby supervisor engines have the same image.
  • The default is RPR mode if different versions are installed.
  • If redundancy is enabled, the default is the mode that you have configured.
  • The default is SSO mode if the system is not configured for redundancy and the active and standby supervisor engines have the same image.
  • The default is RPR mode if different versions are installed.
  • The default is SSO mode if the system is not configured for redundancy and the active and standby supervisor engines have the same image.
  • The default is RPR mode if different versions are installed.

Command Modes

Redundancy configuration (config-red)

Command History

Release

Modification

12.2(14)SX

This command was introduced on the Supervisor Engine 720.

12.2(17b)SXA

This command was modified. Support was added for SSO mode and the default mode change.

12.2(17d)SXB

This command was modified. Support was added for multicast and unicast traffic.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(33)XNE

This command was modified. This command was implemented on the Cisco 10000 router.

Cisco IOS XE Release 2.5

This command was modified. This command was implemented on the Cisco ASR 1000 Series Routers.

Usage Guidelines

Cisco IOS Release 12.2S and 7600 Series Routers

SSO is not supported on Cisco 7600 series routers that are configured with a Supervisor Engine 2.

On releases prior to Release 12.2(17d)SXB, single router mode (SRM) with SSO redundancy does not support stateful switchover for multicast traffic. When a switchover occurs, all multicast hardware switching entries are removed and are then re-created and reinstalled in the hardware by the newly active multilayer switch feature card (MSFC).

SRM/SSO is supported in the following releases only:

  • Release 12.2(17b)SXA and subsequent rebuilds.
  • Release 12.2(17d)SXB and subsequent rebuilds.

Nonstop forwarding (NSF) with SSO redundancy mode supports IPv4. NSF with SSO redundancy mode does not support IPv6, Internetwork Packet Exchange (IPX), and Multiprotocol Label Switching (MPLS).

If you have configured MPLS on the Cisco 7600 series routers with redundant supervisor engines, you must configure the Cisco 7600 series router in RPR mode. The switch should not be running in the default mode of SSO.

Enter the redundancy command in global configuration mode to enter redundancy configuration mode. You can enter the mode command within redundancy configuration mode.

Follow these guidelines when configuring your system for RPR+ mode:

  • You must install compatible images on the active and standby supervisor engines to support RPR+ mode and SSO mode.
  • Both supervisor engines must run the same Cisco IOS software version.
  • Any modules that are not online at the time of a switchover are reset and reloaded on a switchover.
  • The Forwarding Information Base (FIB) tables are cleared on a switchover. As a result, routed traffic is interrupted until route tables reconverge.

The standby supervisor engine reloads on any change of mode and begins to work in the current mode. When you use this command to force the standby supervisor engine to run as a Distributed Forwarding Card (DFC) card, the uplink ports in the standby engine continue to be in use and are not disabled.

Cisco IOS Release XE Release 2.5 and ASR 1000 Series Routers

For Cisco ASR 1002 and 1004 routers, RRP and stateful switchover can be used to switch between Cisco IOS processes. RPR and SSO need to be configured by the user, however, because a second Cisco IOS process is not available by default on Cisco ASR 1002 and 1004 routers. Enter the redundancy command in global configuration mode to enter redundancy configuration mode. You can enter the mode command within redundancy configuration mode.

The Cisco ASR 1006 Router supports a second Route Processor. The second Cisco IOS process can run only on the standby Route Processor. This means that hardware redundancy is available and RPR and SSO do not need to be configured by the user because a second Cisco IOS process is available by default on the Cisco ASR 1006 router.

RPR+ mode is not supported on the Cisco ASR 1000 Series Routers.

Cisco IOS Release 12.2XNE and 1000 Series Routers

Enter the redundancy command in global configuration mode to enter redundancy configuration mode. You can enter the mode command within redundancy configuration mode.

RPR mode is not supported on the Cisco 10000 router.

Examples

This example shows how to set the redundancy mode to RPR+:

Router(config)# redundancy
Router(config-red)# mode rpr-plus

This example shows how to set the redundancy mode to SSO:

Router(config)# redundancy
Router(config-red)# mode sso

Related Commands

Command

Description

redundancy

Enters redundancy configuration mode.

redundancy force-switchover

Forces a switchover from the active to the standby supervisor engine.

route-converge-interval

Configures the time interval after which the old FIB entries are purged.

show redundancy

Displays RF information.

show running-config

Displays the status and configuration of the module or Layer 2 VLAN.