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Cisco IOS Interface and Hardware Component Command Reference, Release 12.3
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Introduction
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Interface and Hardware Component Commands: A through C
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Interface and Hardware Component Commands: D through H
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Interface and Hardware Component Commands: I through L
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Interface and Hardware Component Commands: M through R
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Interface and Hardware Component Commands: scramble through show aps
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Interface and Hardware Component Commands: show compress through show hub
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Interface and Hardware Component Commands: show interfaces through syscon source-interface
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Interface and Hardware Component Commands: T through Z
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Table Of Contents
service single-slot-reload-enable
service-module 56k clock source
service-module 56k data-coding
service-module 56k network-type
service-module 56k remote-loopback
service-module 56k switched-carrier
service-module content-engine reload
service-module content-engine reset
service-module content-engine session clear
service-module content-engine session
service-module content-engine shutdown
service-module content-engine status
service-module external ip address
service-module ip default-gateway
service-module t1 clock source
service-module t1 remote-alarm-enable
service-module t1 remote-loopback
scramble
To enable scrambling (encryption) of the payload on a T3 or E3 controller or on the PA-T3 and PA-E3 port adapters, use the scramble command in interface configuration mode. To disable scrambling, use the no form of this command.
scramble
no scramble
Syntax Description
This command has no arguments or keywords.
Defaults
Scrambling is disabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
T3/E3 scrambling is used to assist clock recovery on the receiving end. Scrambling is designed to randomize the pattern of 1s and 0s carried in the physical layer frame. Randomizing the digital bits can prevent continuous, nonvariable bit patterns—in other words, long strings of all 1s or all 0s. Several physical layer protocols rely on transitions between 1s and 0s to maintain clocking.
Scrambling can prevent some bit patterns from being mistakenly interpreted as alarms by switches placed between the Data Service Units (DSUs).
The local interface configuration must match the remote interface configuration. For example, if you enable scrambling on the local port, you must also do the same on the remote port.
To verify that scrambling is configured on the interface, use the show controllers serial or the show interfaces serial commands.
For T3 controllers, all the DSU modes support scrambling except Clear mode.
For E3 controllers, only Kentrox mode supports scrambling.
Examples
The following example enables scrambling on the PA-E3 port adapter in slot 1, port adapter slot 0, interface 0:
Router(config)# interface serial 1/0/0Router(config-if)# scrambleThe following example enables scrambling on the controller in slot 1, port 0:
Router(config)# interface serial 1/0Router(config-if)# scrambleRelated Commands
show controllers serial
Displays information that is specific to the serial controllers.
show interfaces serial
Displays information that is specific to the interface hardware.
serial restart-delay
To set the amount of time that the router waits before trying to bring up a serial interface when it goes down, use the serial restart-delay command in interface configuration mode. To restore the default, use the no form of the command.
serial restart-delay count
no serial restart-delay
Syntax Description
count
Frequency, in milliseconds, at which the hardware is reset. Range is from 0 to 900. Default is 0.
Defaults
0 milliseconds
Command Modes
Interface configuration
Command History
11.2 P
This command was introduced.
12.2(4)T
The count value was changed to set time in milliseconds rather than in seconds.
Usage Guidelines
The router resets the hardware each time the serial restart timer expires. This command is often used with the dial backup feature and with the pulse-time command, which sets the amount of time to wait before redialing when a DTR dialed device fails to connect.
When the count value is set to the default of 0, the hardware is not reset when it goes down. In this way, if the interface is used to answer a call, it does not cause DTR to drop, which can cause a communications device to disconnect.
Examples
The following example shows how to set the restart delay on serial interface 0 to 0:
Router(config)# interface serial 0Router(config-if)# serial restart-delay 0Related Commands
pulse-time
Enables pulsing DTR signal intervals on the serial interfaces.
show interfaces serial
Displays information about a serial interface.
service single-slot-reload-enable
To enable single line card reloading for all line cards in the Cisco 7500 series router, use the service single-slot-reload-enable command in global configuration mode. To disable single line card reloading for the line cards in the Cisco 7500 series router, use the no form of this command.
service single-slot-reload-enable
no service single-slot-reload-enable
Syntax Description
This command has no arguments or keywords.
Defaults
Single line card reloading is disabled.
Command Modes
Global configuration
Command History
12.0(13)S
This command was introduced.
12.1(5)T
This command was integrated into Cisco IOS Release 12.1(5)T.
Examples
In the following example, single line card reloading is enabled for all lines cards on the Cisco 7500 series router:
Router(config)# service single-slot-reload-enableRelated Commands
show diag
Displays hardware information for a networking device.
show running-config
Displays configuration information.
service-module 56k clock rate
To configure the network line speed for a serial interface on a 4-wire, 56/64-kbps CSU/DSU module, use the service-module 56k clock rate command in interface configuration mode. To enable a network line speed of 56 kbps, which is the default, use the no form of this command.
service-module 56k clock rate speed
no service-module 56k clock rate speed
Syntax Description
Defaults
56 kbps
Command Modes
Interface configuration
Command History
Usage Guidelines
The 56-kbps line speed is available in switched mode, which is enabled using the service-module 56k network-type interface configuration command on the 4-wire CSU/DSU. If you have a 2-wire CSU/DSU module, the default is automatically set to switched mode.
The 64-kbps line speed cannot be used with back-to-back digital data service (DDS) lines. The subrate line speeds are determined by the service provider.
The auto keyword enables the CSU/DSU to decipher current line speed from the sealing current running on the network. Use the auto keyword only when transmitting over telco DDS lines and the clocking source is taken from the line.
Examples
The following example displays two routers connected in back-to-back DDS mode. However, notice that at first the configuration fails because the auto option is used. Later in the example the correct matching configuration is issued, which is 38.4 kbps.
Router1(config)# interface serial 0Router1(config-if)# service-module 56k clock source internalRouter1(config-if)# service-module 56k clock rate 38.4Router2(config-if)# service-module 56k clock rate autoRouter1# ping 10.1.1.2Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.1.1.2, timeout is 2 seconds:.....Success rate is 0 percent (0/5)Router2(config-if)# service-module 56k clock rate 38.4Router1# ping 10.1.1.2Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.1.1.2, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 52/54/56 msWhen transferring from DDS mode to switched mode, you must set the correct clock rate, as shown in the following example:
Router2(config-if)# service-module 56k network-type ddsRouter2(config-if)# service-module 56k clock rate 38.4Router2(config-if)# service-module 56k network-type switched% Have to use 56k or auto clock rate for switched mode% Service module configuration command failed: WRONG FORMAT.Router2(config-if)# service-module 56k clock rate auto% WARNING - auto rate will not work in back-to-back DDS.Router2(config-if)# service-module 56k network-type switchedRelated Commands
service-module 56k clock source
To set up the clock source on a serial interface for a 4-wire, 56/64-kbps CSU/DSU module, use the service-module 56k clock source command in interface configuration mode. To specify that the clocking come from line, use the no form of this command.
service-module 56k clock source {line | internal}
no service-module 56k clock source {line | internal}
Syntax Description
line
Uses the clocking provided by the active line coming in to the router. This is the default.
internal
Uses the internal clocking provided by the hardware module.
Defaults
Line clock
Command Modes
Interface configuration
Command History
Usage Guidelines
In most applications, the CSU/DSU should be configured with the clock source line command. For back-to-back configurations, configure one CSU/DSU with the clock source internal command and the other with clock source line command.
Examples
The following example configures internal clocking and transmission speed at 38.4 kbps.
Router(config)# interface serial 0Router(config-if)# service-module 56k clock source internalRouter(config-if)# service-module 56k clock rate 38.4Related Commands
service-module 56k data-coding
To prevent application data from replicating loopback codes when operating at 64 kbps on a 4-wire CSU/DSU, use the service-module 56k data-coding command in interface configuration mode. To enable normal transmission, use the no form of this command.
service-module 56k data-coding {normal | scrambled}
no service-module 56k data-coding {normal | scrambled}
Syntax Description
Defaults
Normal data transmission
Command Modes
Interface configuration
Command History
Usage Guidelines
Enable the scrambled configuration only in 64-kbps digital data service (DDS) mode. If the network type is set to switched, the configuration is refused.
If you transmit scrambled bit codes, both CSU/DSUs must have this command configured for successful communication.
Examples
The following example scrambles bit codes or user data before transmission:
Router(config)# interface serial 0Router(config-if)# service-module 56k clock rate 64Router(config-if)# service-module 56k data-coding scrambledRelated Commands
Configures the network line speed for a serial interface on a 4-wire, 56/64-kbps CSU/DSU module.
service-module 56k network-type
To transmit packets in switched dial-up mode or digital data service (DDS) mode using a serial interface on a 4-wire, 56/64-kbps CSU/DSU module, use the service-module 56k network-type command in interface configuration mode. To transmit from a dedicated leased line in DDS mode, use the no form of this command.
service-module 56k network-type {dds | switched}
no service-module 56k network-type {dds | switched}
Syntax Description
Defaults
DDS is enabled for the 4-wire CSU/DSU.
Switched is enabled for the 2-wire CSU/DSU.Command Modes
Interface configuration
Command History
Usage Guidelines
In switched mode, you need additional dialer configuration commands to configure dial-out numbers. Before you enable the service-module 56k network-type switched command, both CSU/DSUs must use a clock source coming from the line and have the clock rate configured to auto or 56 kbps. If the clock rate is not set correctly, this command will not be accepted.
The 2-wire and 4-wire, 56/64-kbps CSU/DSU modules use V.25 bis dial commands to interface with the router. Therefore, the interface must be configured using the dialer in-band command. Data terminal ready (DTR) dial is not supported.
Note
Any loopbacks in progress are terminated when switching between modes.
Examples
The following example configures transmission in switched dial-up mode:
Router(config)# interface serial 0Router(config-if)# service-module 56k clock rate autoRouter(config-if)# service-module 56k network-type switchedRouter(config-if)# dialer in-bandRouter(config-if)# dialer string 5550111Router(config-if)# dialer-group 1Related Commands
service-module 56k remote-loopback
To enable the acceptance of a remote loopback request on a serial interface on a 2- or 4-wire, 56/64-kbps CSU/DSU module, use the service-module 56k remote-loopback command in interface configuration mode. To disable the module from entering loopback, use the no form of this command.
service-module 56k remote-loopback
no service-module 56k remote-loopback
Syntax Description
This command has no arguments or keywords.
Defaults
Enabled
Command Modes
Interface configuration
Command History
Usage Guidelines
The no service-module 56k remote-loopback command prevents the local CSU/DSU from being placed into loopback by remote devices on the line. The line provider is still able to put the module into loopback by reversing sealing current. Unlike the T1 module, the 2- or 4-wire, 56/64-kbps CSU/DSU module can still initiate remote loopbacks with the no form of this command configured.
Examples
The following example enables transmitting and receiving remote loopbacks:
Router(config)# interface serial 0Router(config-if)# service-module 56k remote-loopbackRelated Commands
loopback remote (interface)
Loops packets through a CSU/DSU, over a DS3 link or a channelized T1 link, to the remote CSU/DSU and back.
service-module 56k switched-carrier
To select a service provider to use with a 2- or 4-wire, 56/64-kbps dial-up serial line, use the service-module 56k switched-carrier command in interface configuration mode. To enable the default service provider, use the no form of this command.
service-module 56k switched-carrier {att | sprint | other}
no service-module 56k switched-carrier {att | sprint | other}
Syntax Description
Defaults
ATT is enabled on the 4-wire, 56/64-kbps CSU/DSU module.
Sprint is enabled on the 2-wire, switched 56-kbps CSU/DSU module.Command Modes
Interface configuration
Command History
Usage Guidelines
On a Sprint network, echo-canceler tones are sent during call setup to prevent the echo cancelers from damaging digital data. The transmission of echo-canceler tones may increase call setup times by 8 seconds on the 4-wire module. Having echo cancellation enabled does not affect data traffic.
This configuration command is ignored if the network type is DDS.
Examples
The following example configures AT&T as a service provider:
Router(config)# interface serial 0Router(config-if)# service-module 56k network-type switchedRouter(config-if)# service-module 56k switched-carrier attRelated Commands
Sends packets in switched dial-up mode or DDS mode using a serial interface on a 4-wire, 56/64-kbps CSU/DSU module.
service-module content-engine reload
To perform a graceful halt and reboot of a content engine (CE) network module operating system, use the service-module content-engine reload command in privileged EXEC mode.
service-module content-engine slot/unit reload
Syntax Description
slot
Number of the router chassis slot for the network module.
/unit
Number of the daughter card on the network module. For CE network modules, always use 0.
Command Modes
Privileged EXEC
Command History
12.2(11)YT
This command was introduced.
12.2(13)T
This command was integrated into Cisco IOS Release 12.2(13)T.
Usage Guidelines
At the confirmation prompt, press Enter to confirm the action or n to cancel.
Examples
The following example gracefully halts and reboots the CE network module operating system in slot 1:
Router# service-module content-engine 1/0 reloadDo you want to proceed with reload?[confirm]Related Commands
service-module content-engine reset
To reset the hardware on a content engine (CE) network module, use the service-module content-engine reset command in privileged EXEC mode.
service-module content-engine slot/unit reset
Syntax Description
slot
Number of the router chassis slot for the network module.
/unit
Number of the daughter card on the network module. For CE network modules, always use 0.
Command Modes
Privileged EXEC
Command History
12.2(11)YT
This command was introduced.
12.2(13)T
This command was integrated into Cisco IOS Release 12.2(13)T.
Usage Guidelines
At the confirmation prompt, press Enter to confirm the action or n to cancel.
Note
state because you may lose data.Examples
The following example resets the hardware on the CE network module in slot 1:
Router# service-module content-engine 1/0 resetUse reset only to recover from shutdown or failed state
Warning: May lose data on the hard disc!
Do you want to reset?[confirm]
Related Commands
service-module content-engine session clear
To clear an existing content engine (CE) configuration session on a CE network module, use the service-module content-engine session clear command in privileged EXEC mode.
service-module content-engine slot/unit session clear
Syntax Description
slot
Number of the router chassis slot for the network module.
/unit
Number of the daughter card on the network module. For CE network modules, always use 0.
Command Modes
Privileged EXEC
Command History
12.2(11)YT
This command was introduced.
12.2(13)T
This command was integrated into Cisco IOS Release 12.2(13)T.
Usage Guidelines
Press Enter when asked to confirm this command or n to cancel.
Examples
The following example clears the session that had been used to configure the CE in the network module in slot 1:
Router# service-module content-engine 1/0 session clear[confirm][OK]Related Commands
service-module content-engine session
To access a content engine (CE) network module console and begin a configuration session, use the service-module content-engine session command in privileged EXEC mode.
service-module content-engine slot/unit session
Syntax Description
slot
Number of the router chassis slot for the network module.
/unit
Number of the daughter card on the network module. For CE network modules, always use 0.
Command Modes
Privileged EXEC
Command History
12.2(11)YT
This command was introduced.
12.2(13)T
This command was integrated into Cisco IOS Release 12.2(13)T.
Usage Guidelines
Only one session at a time is allowed into the content engine from the internal CE network-module-side interface. This interface provides console access to the CE network module from the router command-line interface (CLI) by initiating a reverse Telnet connection that uses the IP address of the CE interface and the terminal (TTY) line associated with the CE network module. The TTY line number is calculated using the formula (n*32)+1, where n is the number of the chassis slot that contains the CE network module. The CE interface must be up before you can use this command.
Once a session is started, you can perform any CE configuration task. You first access the CE console in a user-level shell. To access the privileged EXEC command shell, where most commands are available, use the enable command. Note that this is a Cisco Application and Content Networking System (ACNS) software command, not a Cisco IOS software command.
CE configuration tasks are described in the documentation for Cisco Application and Content Networking Software, Release 4.2. Initial CE configuration tasks are covered in the Cisco Content Delivery Networking Products Getting Started Guide, section 6, "Perform an Initial Startup Configuration."
After you finish CE configuration and exit the CE console session, use the service-module content-engine session clear command to clear the session.
Examples
The following example shows a CE session being opened for a CE network module in slot 2:
Router# service-module content-engine 2/0 session
Trying 10.10.10.1, 2129 ... OpenCE-netmodule con now availablePress RETURN to get started!CE-netmodule> enableCE-netmodule#Related Commands
service-module content-engine shutdown
To gracefully halt a content engine (CE) network module, use the service-module content-engine shutdown command in privileged EXEC mode.
service-module content-engine slot/unit shutdown
Syntax Description
slot
Number of the router chassis slot for the network module.
/unit
Number of the daughter card on the network module. For CE network modules, always use 0.
Command Modes
Privileged EXEC
Command History
12.2(11)YT
This command was introduced.
12.2(13)T
This command was integrated into Cisco IOS Release 12.2(13)T.
Usage Guidelines
At the confirmation prompt, press Enter to confirm the action or n to cancel.
The service-module content-engine shutdown command brings down the operating system of the specified content engine network module in an orderly fashion to protect the network module's hard drive. When the system has been shut down, the network module can be removed from the router.
Examples
The following example gracefully halts the CE network module in slot 1:
Router# service-module content-engine 1/0 shutdownShutdown is used for Online removal of Service Module.Do you want to proceed with shutdown?[confirm]Use service module reset command to recover from shutdown.Related Commands
service-module content-engine status
To display configuration information related to the hardware and software on the content engine (CE) side of a CE network module, use the service-module content-engine status command in privileged EXEC mode.
service-module content-engine slot/unit status
Syntax Description
slot
Number of the router chassis slot for the network module.
/unit
Number of the daughter card on the network module. For CE network modules, always use 0.
Command Modes
Privileged EXEC
Command History
12.2(11)YT
This command was introduced.
12.2(13)T
This command was integrated into Cisco IOS Release 12.2(13)T.
Examples
The following example displays information for a CE network module in router slot 1:
Router# service-module content-engine 1/0 statusService Module is Cisco Content-Engine1/0Service Module supports session via TTY line 33Service Module is in Steady stateGetting status from the Service Module, please wait..Application and Content Networking Software (ACNS)Copyright (c) 1999-2002 by Cisco Systems, Inc.Application and Content Networking Software Release 4.2.2 (build b3 May 6 2002)Version: ce2636-sw-<unknown-version>Compiled 18:03:40 May 6 2002 by smithCompile Time Options: PPSystem was restarted on Mon Jan 7 20:30:37 1980.The system has been up for 8 minutes, 30 seconds.Core CPU is GenuineIntel Pentium III (Coppermine) (rev 8) running at 498MHz.246 Mbytes of Physical memory.2 FastEthernet interfaces1 Console interfaceList of disk drives:disk00: Normal (h00 c00 i00 l00) 19075MB( 18.6GB)Related Commands
service-module external ip address
To define the IP address for the external LAN interface on a content engine (CE) network module, use the service-module external ip address command in content-engine interface configuration mode. To delete the IP address associated with this interface, use the no form of this command.
service-module external ip address external-ip-addr subnet-mask
no service-module external ip address
Syntax Description
external-ip-addr
IP address of the external LAN interface on a CE network module.
subnet-mask
Subnet mask to append to the IP address.
Defaults
No default behavior or values
Command Modes
Content-engine interface configuration
Command History
12.2(11)YT
This command was introduced.
12.2(13)T
This command was integrated into Cisco IOS Release 12.2(13)T.
Examples
The following example defines an IP address for the external LAN interface on the CE network module in slot 1:
Router(config)# interface content-engine 1/0Router(config-if)# service-module external ip address 172.18.12.28 255.255.255.0Router(config-if)# exitRelated Commands
service-module ip address
To define the IP address for the internal network-module-side interface on a content engine (CE) network module, use the service-module ip address command in content-engine interface configuration mode. To delete the IP address associated with this interface, use the no form of this command.
service-module ip address ce-side-ip-addr subnet-mask
no service-module ip address
Syntax Description
ce-side-ip-addr
IP address of the internal network-module-side interface on a CE network module.
subnet-mask
Subnet mask to append to the IP address.
Defaults
No default behavior or values
Command Modes
Content-engine interface configuration
Command History
12.2(11)YT
This command was introduced.
12.2(13)T
This command was integrated into Cisco IOS Release 12.2(13)T.
Examples
The following example defines an IP address for the internal network-module-side interface on the CE network module in slot 1:
Router(config)# interface content-engine 1/0Router(config-if)# service-module ip address 172.18.12.26 255.255.255.0Router(config-if)# exitRelated Commands
service-module ip default-gateway
To define a default gateway (router) for a content engine (CE) network module, use the service-module ip default-gateway command in content-engine interface configuration mode. To remove the default gateway from the CE configuration, use the no form of this command.
service-module ip default-gateway gw-ip-addr
no service-module ip default-gateway
Syntax Description
Defaults
No default behavior or values
Command Modes
Content-engine interface configuration
Command History
12.2(11)YT
This command was introduced.
12.2(13)T
This command was integrated into Cisco IOS Release 12.2(13)T.
Examples
The following example configures a default gateway for the CE network module in slot 1:
Router(config)# interface content-engine 1/0Router(config-if)# service-module ip default-gateway 172.18.12.1Router(config-if)# exitRelated Commands
service-module t1 clock source
To specify the clock source for the fractional T1/T1 CSU/DSU module, use the service-module t1 clock source command in interface configuration mode. To return to the default line clock, use the no form of this command.
service-module t1 clock source {internal | line}
no service-module t1 clock source
Syntax Description
Defaults
Line clock
Command Modes
Interface configuration
Command History
Examples
The following example sets an internal clock source on serial line 0:
Router(config)# interface serial 0Router(config-if)# service-module t1 clock source internalRelated Commands
Sets up the clock source on a serial interface for a 4-wire, 56/64-kbps CSU/DSU module.
service-module t1 data-coding
To guarantee the ones density requirement on an alternate mark inversion (AMI) line using the fractional T1/T1 module, use the service-module t1 data-coding command in interface configuration mode. To enable normal data transmission, use the no form of this command.
service-module t1 data-coding {inverted | normal}
no service-module t1 data-coding
Syntax Description
inverted
Inverts bit codes by changing all 1 bits to 0 bits and all 0 bits to 1 bits.
normal
Requests that no bit codes be inverted before transmission. This is the default.
Defaults
Normal transmission
Command Modes
Interface configuration
Command History
Usage Guidelines
Data inversion is used to guarantee the ones density requirement on an AMI line when using bit-oriented protocols such as High-Level Data Link Control (HDLC), PPP, X.25, and Frame Relay. If the time slot speed is set to 56 kbps, this command is rejected because line density is guaranteed when transmitting at 56 kbps. Use this command with the 64-kbps line speed.
If you transmit inverted bit codes, both CSU/DSUs must have this command configured for successful communication.
Examples
The following example inverts bit codes using a time slot speed of 64 kbps:
Router(config)# interface serial 0Router(config-if)# service-module t1 timeslots all speed 64Router(config-if)# service-module t1 data-coding invertedRelated Commands
Selects the linecode for the fractional T1/T1 module.
Defines time slots that constitute a fractional T1/T1 (FT1/T1) channel.
service-module t1 fdl
To set the facilities data link (FDL) parameter to either ATT or ANSI, use the service-module t1 fdl command in interface configuration mode. To ignore the FDL parameter, use the no form of this command.
service-module t1 fdl {ansi | att}
no service-module t1 fdl
Syntax Description
Defaults
Determined by the telephone company
Command Modes
Interface configuration
Command History
Usage Guidelines
The default is no service-module t1 fdl. The ansi or att options are determined by your service provider or telephone company.
Examples
The following example sets the FDL parameter to ANSI:
Router(config)# interface serial 0Router(config-if)# service-module t1 fdl ansiservice-module t1 framing
To select the frame type for a line using the fractional T1/T1 (FT1/T1) module, use the service-module t1 framing command in interface configuration mode. To revert to the default, Extended Super Frame, use the no form of this command.
service-module t1 framing {esf | sf}
no service-module t1 framing {esf | sf}
Syntax Description
esf
Specifies extended super frame (ESF) as the T1 frame type. This is the default.
sf
Specifies D4 super frame (SF) as the T1 frame type.
Defaults
esf
Command Modes
Interface configuration
Command History
Usage Guidelines
Use this command in configurations in which the router communicates with FT1/T1 data lines. The service provider determines which framing type, either esf or sf, is required for your circuit.
Examples
The following example enables Super Frame as the FT1/T1 frame type:
Router(config-if)# service-module t1 framing sfservice-module t1 lbo
To configure the CSU line-build-out (LBO) on a fractional T1/T1 CSU/DSU module, use the service-module t1 lbo command in interface configuration mode. To disable line-build-out, use the no form of this command.
service-module t1 lbo {-15 db | -7.5 db | none}
no service-module t1 lbo {-15 db | -7.5 db | none}
Syntax Description
-15 db
Decreases outgoing signal strength by 15 dB.
-7.5 db
Decreases outgoing signal strength by 7.5 dB.
none
Transmits packets without decreasing outgoing signal strength.
Defaults
Disabled
Command Modes
Interface configuration
Command History
Usage Guidelines
Use this command to decrease the outgoing signal strength to an optimum value for a fractional T1 line receiver. The ideal signal strength should be -15 dB to -22 dB, which is calculated by adding the phone company loss, cable length loss, and line build out.
You may use this command in back-to-back configurations, but it is not needed on most actual T1 lines.
Examples
The following example sets the LBO to -7.5 dB:
Router(config)# interface serial 0Router(config-if)# service-module t1 lbo -7.5 dbservice-module t1 linecode
To select the line code for the fractional T1/T1 module, use the service-module t1 linecode command in interface configuration mode. To select the default, the B8ZS line code, use the no form of this command.
service-module t1 linecode {ami | b8zs}
no service-module t1 linecode {ami | b8zs}
Syntax Description
ami
Specifies alternate mark inversion (AMI) as the line code.
b8zs
Specifies binary 8 zero substitution (B8ZS) as the line code. This is the default.
Defaults
The default line code is B8ZS.
Command Modes
Interface configuration
Command History
Usage Guidelines
Configuring B8ZS is a method of ensuring the ones density requirement on a T1 line by substituting intentional bipolar violations in bit positions four and seven for a sequence of eight zero bits. When the CSU/DSU is configured for AMI, you must guarantee the ones density requirement in your router configuration using the service-module t1 data-coding inverted command or the service-module t1 time slots speed 56 command.
Your T1 service provider determines which line code, either ami or b8zs, is required for your T1 circuit.
Examples
The following example specifies AMI as the line code:
Router(config)# interface serial 0Router(config-if)# service-module t1 linecode amiRelated Commands
Guarantees the ones density requirement on an AMI line using the fractional T1/T1 module.
Defines time slots that constitute a fractional T1/T1 (FT1/T1) channel.
service-module t1 remote-alarm-enable
To generate remote alarms (yellow alarms) at the local CSU/DSU or detect remote alarms sent from the remote CSU/DSU, use the service-module t1 remote-alarm-enable command in interface configuration mode. To disable remote alarms, use the no form of this command.
service-module t1 remote-alarm-enable
no service-module t1 remote-alarm-enable
Syntax Description
This command has no arguments or keywords.
Defaults
Remote alarms are disabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
Remote alarms are transmitted by the CSU/DSU when it detects an alarm condition, such as a red alarm (loss of frame) or blue alarm (unframed ones). The receiving CSU/DSU then knows that there is an error condition on the line.
With D4 Super Frame configured, a remote alarm condition is transmitted by setting the bit 2 of each time slot to zero. For received user data that has the bit 2 of each time slot set to zero, the CSU/DSU interprets the data as a remote alarm and interrupts data transmission, which explains why remote alarms are disabled by default. With Extended Super Frame configured, the remote alarm condition is signalled out of band in the facilities data link.
You can see if the FT1/T1 CSU/DSU is receiving a remote alarm (yellow alarm) by issuing the show service-modue serial command.
Examples
The following example enables remote alarm generation and detection:
Router(config)# interface serial 0Router(config-if)# service-module t1 remote-alarm-enableRelated Commands
Selects the frame type for a line using the fractional T1/T1 (FT1/T1) module.
show service-module serial
Displays performance statistics for an integrated CSU/DSU.
service-module t1 remote-loopback
To specify if the fractional T1/T1 CSU/DSU module enters loopback mode when it receives a loopback code on the line, use the service-module t1 remote-loopback command in interface configuration mode. To disable remote loopbacks, use the no form of this command.
service-module t1 remote-loopback {full | payload} [alternate | v54]
no service-module t1 remote-loopback {full | payload}
Syntax Description
Note
Defaults
Full and payload loopbacks with standard-loopup codes
Command Modes
Interface configuration
Command History
Usage Guidelines
You can simultaneously configure the full and payload loopback points. However, only one loopback code can be configured at a time. For example, if you configure the service-module t1 remote-loopback payload alternate command, a payload v54 request cannot be transmitted or accepted.
The no form of this command disables loopback requests. For example, the no service-module t1 remote-loopback full command ignores all full-bandwidth loopback transmissions and requests. Configuring the no form of this command may not prevent telco line providers from looping your router in esf mode, because fractional T1/T1 lines use facilities data link messages to initiate loopbacks.
If you enable the service-module t1 remote-loopback command, the loopback remote commands on the FT1/T1 CSU/DSU module will not be successful.
Examples
The following example displays two routers connected back-to-back through a fractional T1/T1 line:
Router(config-if)# no service-module t1 remote-loopback fullRouter(config-if)# service-module t1 remote-loopback payload alternateRouter(config-if)# loopback remote full%SERVICE_MODULE-5-LOOPUPFAILED: Unit 0 - Loopup of remote unit failedRouter(config-if)# service-module t1 remote-loopback payload v54Router(config-if)# loopback remote payload%SERVICE_MODULE-5-LOOPUPFAILED: Unit 0 - Loopup of remote unit failedRouter(config-if)# service-module t1 remote-loopback payload alternateRouter(config-if)# loopback remote payload%SERVICE_MODULE-5-LOOPUPREMOTE: Unit 0 - Remote unit placed in loopbackRelated Commands
loopback remote (interface)
Loops packets through a CSU/DSU, over a DS3 link or a channelized T1 link, to the remote CSU/DSU and back.
service-module t1 timeslots
To define time slots that constitute a fractional T1/T1 (FT1/T1) channel, use the service-module t1 timeslots command in interface configuration mode. To resume the default setting (all FT1/T1 time slots transmit at 64 kbps), use the no form of this command.
service-module t1 timeslots {range | all} [speed {56 | 64}]
no service-module t1 timeslots {range | all}
Syntax Description
Defaults
64 kbps is the default for all time slots.
Command Modes
Interface configuration
Command History
Usage Guidelines
This command specifies which time slots are used in fractional T1 operation and determines the amount of bandwidth available to the router in each FT1/T1 channel.
The time-slot range must match the time slots assigned to the channel group. Your service provider defines the time slots that comprise a channel group.
To use the entire T1 line, enable the service-module t1 timeslots all command.
Examples
The following example displays a series of time-slot ranges and a speed of 64 kbps:
Router(config-if)# service-module t1 timeslots 1-10,15-20,22 speed 64Related Commands
Guarantees the ones density requirement on an AMI line using the fractional T1/T1 module.
Selects the linecode for the fractional T1/T1 module.
set ip df
To change the Don't Fragment (DF) bit value in the IP header, use the set ip df command in route-map configuration mode. To disable changing the DF bit value, use the no form of this command.
set ip df {0 | 1}
no set ip df {0 | 1}
Syntax Description
0
Sets the DF bit to 0 (clears the DF bit ) and allows packet fragmentation.
1
Sets the DF bit to 1 which prohibits packet fragmentation.
Defaults
The DF bit value is not changed in the IP header.
Command Modes
Route-map configuration
Command History
Usage Guidelines
Using Path MTU Discovery (PMTUD) you can determine an MTU value for IP packets that avoids fragmentation. If ICMP messages are blocked by a router, the path MTU is broken and packets with the DF bit set are discarded. Use the set ip df command to clear the DF bit and allow the packet to be fragmented and sent. Fragmentation can slow the speed of packet forwarding on the network but access lists can be used to limit the number of packets on which the DF bit will be cleared.
Note
Examples
The following example shows how to clear the DF bit to allow fragmentation. In this example a router is blocking ICMP messages and breaking the path MTU. Using policy routing both the inbound and outbound packets on interface serial 0 will have their DF bit set to 0 which allows fragmentation.
interface serial 0ip policy route-map clear-df-bitroute-map clear-df-bit permit 10match ip address 111set ip df 0access-list 111 permit tcp any anyRelated Commands
ip tcp path-mtu-discovery
Enables Path MTU Discovery.
route-map
Defines a route map to control where packets are output.
shelf-id
To change the shelf number assigned to the router shelf or dial shelf on the Cisco AS5800, use the shelf-id command in global configuration mode. To return the shelf numbers to the default value, use the no form of this command.
shelf-id number {router-shelf | dial-shelf}
no shelf-id number
Syntax Description
number
Number to assign to the shelf. Rang is from 0 to 9999.
router-shelf
Assigns the specified number to the router shelf.
dial-shelf
Assigns the specified number to the dial shelf.
Defaults
The default shelf number for the router shelf is 0.
The default shelf number for the dial shelf is 1 or one number higher than the specified router shelf number.Command Modes
Global configuration
Command History
Usage Guidelines
The shelf number is used to distinguish between cards on the router shelf and cards on the dial shelf.
Caution
You can specify the shelf number through the setup facility during initial configuration of the
Cisco AS5800. This is the recommended method to specify shelf numbers.To display the shelf numbers, use the show running-config command. If a shelf number has been changed, the pending change is shown in the output of the show version command (for example, the dial-shelf ID is 87; will change to 2 on reload).
Examples
In the following example, the dial shelf is assigned the number 456:
Router(config)# shelf-id 456 dial-shelfRouter(config)# exitRelated Commands
show version
Displays the configuration of the system hardware, the software version, the names and sources of configuration files, and the boot images.
show alarm-interface
To display the alarm interface controller (AIC) configuration setting and the information sent to the Cisco IOS software by the AIC, use the show alarm-interface command in privileged EXEC mode.
show alarm-interface [slot-number] [summary]
Syntax Description
slot-number
(Optional) Slot number in which the AIC was placed.
summary
(Optional) Selects the summary format for the output message.
Defaults
Displays verbose message output and displays all AICs in all slot numbers on the router.
Command Modes
Privileged EXEC
Command History
12.2(2)XG
This command was introduced on the Cisco 2600 series and Cisco 3600 series.
12.2(8)T
This command was integrated into Cisco IOS Release 12.2(8)T.
Examples
The following is sample output from the show alarm-interface summary command:
Router# show alarm-interface 5 summaryAlarm Interface Card in Slot 5:Configured IP address:10.2.130.102Status: KEEPALIVE TIMER EXPIREDAlarm Interface Card in Slot 5:Configured IP address:10.2.130.102Status:KEEPALIVE TIMER EXPIREDThe following is an example of a verbose show alarm-interface display:
Router# show alarm-interface 4Alarm Interface Card in Slot 4:Configured IP address: 10.10.10.2Status: RUNNINGTimer expires in < 11 min.Reported version: 00 00 00 01Expected version: 00 00 00 01Last Self Test result: READYLast Start-Up message:----------<AIC>: Hardware Version 1, Revision A Software Version 2, Revision A 1.0.1 Installed and running, POST passed.----------Last Status severity: 0Last Status message:----------Status----------Table 11 describes significant fields shown in this output.
Related Commands
show aps
To display information about the current automatic protection switching (APS) feature, use the show aps command in privileged EXEC mode.
show aps
Syntax Description
This command has no arguments or keywords.
Command Modes
Privileged EXEC
Command History
Examples
The following is sample output from the show aps command on a router configured with a working interface. In this example, POS interface 0/0/0 is configured as a working interface in group 1, and the interface is selected (that is, active).
Router1# show apsPOS0/0/0 working group 1 channel 1 Enabled SelectedThe following is sample output from the show aps command on a router configured with a protect interface. In this example, POS interface 2/0/0 is configured as a protect interface in group 1, and the interface is not selected (the ~ indicates that the interface is not active). The output also shows that the working channel is located on the router with the IP address 10.1.6.1 and that the interface is currently selected (that is, active).
Router2# show apsPOS2/0/0 protect group 1 channel 0 bidirectional ~SelectedRx_K1= 0, Rx_K2= 0 Tx_K1= 0 Tx_K2= 5Working channel 1 at 10.1.6.1 EnabledFor the K1 field (8 bits), the first 4 bits indicate the channel number that has made the request, and the last 4 bits map to the requests (local or external) listed in Table 12. For the K2 field (8 bits), the first 4 bits indicate the channel number bridged onto the protect line, the next bit is the architecture used, and the last 3 bits indicate the mode of operation or non-APS use listed in Table 12.
