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Configuring Serial Interfaces on Cisco IOS XR
Software
This module describes the serial interfaces on routers supporting Cisco IOS XR software. Before you
configure a serial interface, you must configure the clear channel T3/E3 controller or channelized
T1/E1controller (DS0 channel) that is associated with that interface.
Feature History for Configuring Serial Controller Interfaces
Release Modification
Release 3.3.0 This feature was introduced on the Cisco XR 12000 Series Router.
Support was
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Configuring Serial Interfaces on Cisco IOS XR Software Prerequisites for Configuring Serial Interfaces Prerequisites for Configuring Serial Interfaces Before configuring serial interfaces, be sure that the following tasks and conditions are met: � You must be in a user group associated with a task group that includes the proper task IDs for serial Interface commands. Task IDs for commands are listed in Cisco IOS XR Interface and Hardware Component Command Reference. � Your hardware must suppor
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Configuring Serial Interfaces on Cisco IOS XR Software Information About Serial Interfaces High Level Over-View: Serial Interface Configuration on Clear-Channel SPAs Table 10 provides a high-level overview of the tasks required to configure a T3 serial interface on a 2-Port and 4-Port Clear Channel T3/E3 SPA. Table 10 Overview: Configuring a T3 Serial Interface on a Clear Channel SPA Step Task Module Section 1. Use the hw-module subslot “Configuring Clear Channel T3/E3 “Setting the Card Type fo
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Configuring Serial Interfaces on Cisco IOS XR Software Information About Serial Interfaces High Level Over-View: Serial Interface Configuration on Channelized SPAs Table 12 provides a high-level overview of the tasks required to configure a T1 serial interface on the 2-Port and 4-Port Channelized T3 SPA. Table 12 Overview: Configuring a Serial Interface on a T1 DS0 Channel Step Task Module Section 1. Configure the T3 controller “Configuring Clear Channel “Configuring a Channelized T3-to-T1 par
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Configuring Serial Interfaces on Cisco IOS XR Software Information About Serial Interfaces Default Settings for Serial Interface Configurations When an interface is enabled on a T3/E3 SPA, and no additional configuration commands are applied, the default interface settings shown in Table 14 are present. These default settings can be changed by configuration. Default settings do not appear in the output of the show running-config command. Table 14 Serial Interface Default Settings Parameter Con
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Configuring Serial Interfaces on Cisco IOS XR Software Information About Serial Interfaces � t1-num: T1 or E1 channel number. T1 channels range from 0 to 23; E1 channels range from 0 to 30. � channel-group-number: Time slot number. T1 time slots range from 1 to 24; E1 time slots range from 1 to 31. The channel-group-number is preceded by a colon and not a slash. Use the question mark (?) online help function following the serial keyword to view a list of all valid interface choices. Cisco IOS
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Configuring Serial Interfaces on Cisco IOS XR Software How to Configure Serial Interfaces Keepalives are independent between the two peers. One peer end can have keepalives enabled; the other end can have them disabled. Even if keepalives are disabled locally, LCP still responds with ECHOREP packets to the ECHOREQ packets it receives. Similarly, LCP also works if the period of keepalives at each end is different. When the interface has PPP encapsulation, if LCP sends three ECHOREQ packets wit
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Configuring Serial Interfaces on Cisco IOS XR Software How to Configure Serial Interfaces 13. end or commit 14. show interfaces serial instance DETAILED STEPS Command or Action Purpose configure Step 1 Enters global configuration mode. Example: RP/0/0/CPU0:router# configure Step 2 interface serial instance Specifies the serial interface name and enters interface configuration mode. Naming notation for T3/E3 interfaces is rack/slot/module/port and for T1/E1/DS0 interfaces is Example: rack/slo
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Configuring Serial Interfaces on Cisco IOS XR Software How to Configure Serial Interfaces Command or Action Purpose scramble Step 9 (Optional) Enables payload scrambling on the interface. Note Payload scrambling is disabled on the interface. Example: RP/0/0/CPU0:ios(config-if-serial)# scramble transmit-delay hdlc-flags Step 10 (Optional) Specifies a transmit delay on the interface. Values can be from 0 to 128. Example: Note Transmit delay is disabled by default (the transmit RP/0/0/CPU0:ios(c
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Configuring Serial Interfaces on Cisco IOS XR Software Configuration Examples for Serial Interfaces Configuration Examples for Serial Interfaces The following example shows how to configure a basic serial interface: RP/0/0/CPU0:Router#config RP/0/0/CPU0:Router(config)# interface Serial0/3/0/0/0:0 RP/0/0/CPU0:Router(config-if)# ipv4 address 192.0.2.2 255.255.255.252 RP/0/0/CPU0:Router(config-if)# serial RP/0/0/CPU0:Router(config-if-serial)# crc 16 RP/0/0/CPU0:Router(config-if-serial)# invert RP/0
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Configuring Serial Interfaces on Cisco IOS XR Software Additional References Related Topic Document Title Cisco IOS XR AAA services configuration information Cisco IOS XR System Security Configuration Guide and Cisco IOS XR System Security Command Reference Information about configuring interfaces and other Cisco CRS-1 Series Carrier Routing System Craft Works Interface components on the Cisco CRS-1 from a remote Craft Configuration Guide Works Interface (CWI) client management application Stan
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Configuring Serial Interfaces on Cisco IOS XR Software Additional References Cisco IOS XR Interface and Hardware Component Configuration Guide HC-126
