Cisco Nexus 1000V Command Reference, Release 4.0(4)SV1(3)
E Commands
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E Commands

Table Of Contents

E Commands

echo

end

errdisable detect cause

errdisable recovery cause

errdisable recovery interval

erspan-id

exec-timeout

exit

exporter


E Commands


This chapter describes the Cisco Nexus 1000V commands that begin with the letter E.

echo

To echo an argument back to the terminal screen, use the echo command.

echo [backslash-interpret] [text]

Syntax Description

-e

(Optional) Interprets any character following a backslash character (\) as a formatting option.

backslash-interpret

(Optional) Interprets any character following a backslash character (\) as a formatting option.

text

(Optional) Text string to display. The text string is alphanumeric, case sensitive, can contain spaces, and has a maximum length of 200 characters. The text string can also contain references to CLI variables.


Defaults

Displays a blank line.

Command Modes

Any

Supported User Roles

network-admin

Command History

Release
Modification

4.0(4)SV1(1)

This command was introduced.


Usage Guidelines

You can use this command in a command script to display information while the script is running.

Table 1 lists the formatting keywords that you can insert in the text when you include the -e or backslash-interpret keyword.

Table 1 Formatting Options for the echo Command 

Formatting Option
Description

\b

Back spaces.

\c

Removes the new line character at the end of the text string.

\f

Inserts a form feed character.

\n

Inserts a new line character.

\r

Returns to the beginning of the text line.

\t

Inserts a horizontal tab character.

\v

Inserts a vertical tab character.

\\

Displays a backslash character.

\nnn

Displays the corresponding ASCII octal character.


Examples

This example shows how to display a blank line at the command prompt:

n1000v# echo
 
   

This example shows how to display a line of text at the command prompt:

n1000v# echo Script run at $(TIMESTAMP).
Script run at 2008-08-12-23.29.24.
 
   

This example shows how to use a formatting option in the text string:

n1000v# echo backslash-interpret This is line #1. \nThis is line #2.
This is line #1.
This is line #2.
 
   

Related Commands

Command
Description

run-script

Runs command scripts.


end

To exit a configuration mode and return to Privileged EXEC mode, use the end command.

end

Syntax Description

This command has no arguments or keywords.

Defaults

None

Command Modes

Any

Supported User Roles

network-admin
network-operator

Command History

Release
Modification

4.0(4)SV1(1)

This command was introduced.


Usage Guidelines

This command differs from the exit command in that the exit command returns you to the configuration mode you were previously in. The end command always takes you completely out of configuration mode and places you in privileged EXEC mode.

Examples

This example shows how to end the session in Global Configuration mode and return to privileged EXEC mode:

n1000v(config)# end
n1000v#
 
   

This example shows how to end the session in Interface Configuration mode and return to privileged EXEC modee:

n1000v(config-if)# end
n1000v#
 
   

Related Commands

Command
Description

exit

Exits the current command mode and returns you to the previous command mode.


errdisable detect cause

To detect the reason an interface is error-disabled, use the errdisable detect cause command. To stop error detection, use the no form of this command. In the case of a policy installation failure, the no form of this command will not bring the port down.

errdisable detect cause {all | arp-inspection | dhcp-rate-limit | link-flap | loopback}

no errdisable detect cause {all | arp-inspection | dhcp-rate-limit | link-flap | loopback}

Syntax Description

all

Enables error-disabled detection on all causes.

arp-inspection

Enables error-disabled detection on arp-inspection.

dhcp-rate-limit

Enables error-disabled detection on dhcp-rate-limit.

link-flap

Enables error-disabled disable detection on link-state flapping.

loopback

Enables error-disabled detection on a loopback.


Command Default

Disabled

Command Modes

Global configuration (config)

Supported User Roles

network-admin

Command History

Release
Modification

4.0(4)SV1(2)

This command was introduced.


Usage Guidelines

The error-disabled state is an operational state that is similar to the link-down state. You must enter the shutdown command and then the no shutdown command to recover an interface manually from the error-disabled state.

Examples

This example shows how to detect the cause of the error-disabled state for all applications:

n1000v(config)# errdisable detect cause all
n1000v(config)#

Related Commands

Command
Description

shutdown

Brings the port down administratively.

no shutdown

Brings the port up administratively.

show interface status err-disabled

Displays the interfaces currently in the error-disabled state.


errdisable recovery cause

To enable an application to automatically recover an interface from the error-disabled (errdisable), use the errdisable recovery cause command. To return to the default setting, use the no form of this command.

errdisable recovery cause {all | arp-inspection | bpduguard | dhcp-rate-limit | link-flap | psecure-violation | security-violation | udld}

no errdisable recovery cause {all | arp-inspection | bpduguard | dhcp-rate-limit | link-flap | psecure-violation | security-violation | udld}

Syntax Description

all

Enables automatic recovery from all causes for the error-disabled state.

arp-inspection

Enables automatic recovery from the ARP inspection error state.

bpduguard

Enables automatic recovery from BPDU Guard error-disabled state.

dhcp-rate-limit

Enables automatic recovery from the DHCP rate-limit error state.

link-flap

Enables automatic recovery from link-state flapping.

psecure-
violation

Enables timer automatic recovery from the psecure violation disable state.

security-
violation

Enables automatic recovery from the 802.1X violation disable state.

udld

Enables automatic recovery from the UDLD error-disabled state.


Command Default

Disabled

Command Modes

Global configuration (config)

Supported User Roles

network-admin

Command History

Release
Modification

4.0(4)SV1(2)

This command was introduced.


Usage Guidelines

Examples

This example shows how to automatically recover from the error-disabled state for link flapping after you have enabled the recovery timer:

n1000v(config)# errdisable recovery cause link-flap
n1000v(config)#

Related Commands

Command
Description

errdisable recovery interval

Enables the recovery timer.

show interface status err-disabled

Displays the interface error-disabled state.


errdisable recovery interval

To enable the recovery timer, use the errdisable recovery interval command.

errdisable recovery interval interval

Syntax Description

interval

Error detection for access-list installation failures. The range is from 30 to 65535.


Command Default

300 seconds

Command Modes

Global configuration (config)

Supported User Roles

network-admin

Command History

Release
Modification

4.0(4)SV1(2)

This command was introduced.


Usage Guidelines

Use the errdisable recovery interval command to configure the recovery timer.

Examples

This example shows how to configure the recovery timer:

n1000v(config)# errdisable recovery interval 32
n1000v(config)#

Related Commands

Command
Description

errdisable recovery cause

Enables the error-disabled recovery for an application.

show interface status err-disabled

Displays the interface error-disabled state.


erspan-id

To add an Encapsulated Remote Switch Port Analyzer (ERSPAN) ID to the session configuration and save it in the running configuration, use the erspan-id command.

erspan-id flow_id

Syntax Description

flow_id

Flow ID to be assigned to the ERSPAN session. The range is 1-1023.


Defaults

None

Command Modes

CLI ERSPAN source configuration (config-erspan-src)

Supported User Roles

network-admin

Command History

Release
Modification

4.0(4)SV1(1)

This command was introduced.


Usage Guidelines

The session ERSPAN ID is added to the ERSPAN header of the encapsulated frame and can be used at the termination box to differentiate between various ERSPAN streams of traffic.

Examples

This example shows how to add ERSPAN ID 51 to the session configuration and save it in the running configuration:

n1000v# config t
n1000v(config)# monitor session type erspan-source
n1000v(config-erspan-src)# erspan_id 51
n1000v(config-erspan-src)# 

Related Commands

Command
Description

monitor session type erspan-source

Creates a session with the given session number and puts you in the CLI ERSPAN source configuration mode.

source

For the specified session, configures the source and the direction of traffic to monitor, and saves this information in the running configuration.

filter vlan

For the specified ERSPAN session, configures the VLANs, VLAN lists, or VLAN ranges to be monitored.

ip ttl

Specifies the IP time-to-live value for the packets in the ERSPAN traffic.

ip prec

Specifies the IP precedence value for the packets in the ERSPAN traffic.

mtu

Specifies a maximum transmission unit (MTU) size for the ERSPAN traffic.

show monitor session

Displays the ERSPAN session configuration as it exists in the running configuration.


exec-timeout

To configure the length of time, in minutes, that an inactive Telnet or SSH session remains open before it is automatically shut down, use the exec-timeout command. To remove an exec timeout setting, use the no form of this command.

exec-timeout time

no exec-timeout [time]

Syntax Description

time

Timeout time, in minutes. The range of valid values is 0 to 525600.

If a session remains inactive longer than this specified time period, then it is automatically closed.


Defaults

No timeout is configured.

Command Modes

Console configuration (config-console)

Supported User Roles

network-admin

Command History

Release
Modification

4.0(4)SV1(1)

This command was introduced.


Usage Guidelines

When you set time to 0, exec timeout is disabled.

Examples

This example shows how to configure an inactive session timeout for the console port:

n1000v# configure terminal
n1000v(config)# line console
n1000v(config-com1)# exec-timeout 20
 
   

This example shows how to configure an inactive session timeout for the virtual terminal:

n1000v# configure terminal
n1000v(config)# line vty
n1000v(config-line)# exec-timeout 20
 
   

This example shows how to remove an exec timeout on the console port:

n1000v(config)# configure terminal
DocTeamVSM(config)# line console
n1000v(config-console)# no exec-timeout
n1000v(config-console)# 
 
   

Related Commands

Command
Description

show terminal

Displays the terminal configuration, including the timeout value.

show users

Displays the currently active user sessions.


exit

To exit a configuration mode or exit the CLI, use the exit command.

exit

Syntax Description

This command has no arguments or keywords.

Defaults

None

Command Modes

Any

Supported User Roles

network-admin
network-operator

Command History

Release
Modification

4.0(4)SV1(1)

This command was introduced.


Examples

This example shows how to exit global configuration mode. The CLI returns you to the EXEC mode.

n1000v(config)# exit
n1000v#
 
   

This example shows how to exit interface configuration mode. The CLI returns you to the global configuration mode.

n1000v(config-if)# exit
n1000v(config)#
 
   

This example shows how to exit the CLI.

n1000v# exit
 
   

Related Commands

Command
Description

end

Returns to the EXEC command mode.


exporter

To add an existing flow exporter to a specific flow monitor and save it in the running configuration, use the exporter command. To remove the flow exporter for a specific flow monitor, use the no form of this command.

exporter name

no exporter name

Syntax Description

name

Name of the flow exporter to be added for the flow monitor.


Defaults

None

Command Modes

CLI flow monitor configuration (config-flow-monitor)

Supported User Roles

network-admin

Command History

Release
Modification

4.0(4)SV1(1)

This command was introduced.


Examples

This example shows how to add the flow exporter called Exportv9 and save it in the running configuration:

n1000v# config t
n1000v(config)# flow monitor MonitorTest
n1000v(config-flow-monitor)# exporter Exportv9
n1000v(config-flow-monitor)#
 
   

This example shows how to remove the flow exporter called Exportv9:

n1000v# config t
n1000v(config)# flow monitor MonitorTest
n1000v(config-flow-monitor)# no exporter Exportv9
n1000v(config-flow-monitor)#
 
   

Related Commands

Command
Description

flow monitor

Creates a flow monitor, by name, saves it in the running configuration, and then puts you in the CLI flow monitor configuration mode.

description

Adds a descriptive string for the specified flow monitor and saves it in the running configuration.

exporter

Adds an existing flow exporter for the specified monitor and saves it in the running configuration.

record

Adds an existing flow record for the specified monitor and saves it in the running configuration.

timeout

Specifies, for the specified monitor, an aging timer and its value for aging entries from the cache, and saves them in the running configuration.

cache

Specifies the cache size for the specifed monitor and saves it in the running configuration.