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Configuring Serial Interfaces on Cisco IOS XR Software
Prerequisites for Configuring Serial Interfaces
HC-116
Cisco IOS XR Interface and Hardware Component Configuration Guide
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 support T3/E3 controllers and serial interfaces. The following hardware
supports T3/E3 controllers and serial interfaces in Cisco IOS XR Software Release 3.3:
–
2-Port and 4-Port Clear Channel T3/E3 SPAs
–
2-Port and 4-Port Channelized T3 SPAs
Note The 2-Port and 4-Port Channelized T3 SPAs support T1/E1 controllers and DS0 channels.
• You have already configured the clear channel T3/E3 controller or channelized
T3-to-T1/E1controller that is associated with the serial interface you want to configure, as described
in the Configuring Clear Channel T3/E3 Controllers and Channelized T3 Controllers on
Cisco IOS XR Software module earlier in this document.
Information About Serial Interfaces
Serial interfaces are supported on the following Cisco XR 12000 Series Router shared port adapter
(SPA) cards:
• 2-Port and 4-Port Clear Channel T3/E3 SPAs
• 2-Port and 4-Port Channelized T3 SPAs
Note The 2-Port and 4-Port Channelized T3 SPAs can run in clear channel mode, or they can be
channelized into 28 T1 or 21 E1 controllers.
T3/E3 serial interfaces are automatically created on clear channel T3/E3 controllers. On channelized
T3-to-T1/E1 controllers, serial interfaces are automatically created when users configure individual DS0
channel groups the T1/E1 controllers.
To configure serial interfaces, you must understand the following concepts:
• High Level Over-View: Serial Interface Configuration on Clear-Channel SPAs, page HC-117
• High Level Over-View: Serial Interface Configuration on Channelized SPAs, page HC-118
• Default Settings for Serial Interface Configurations, page HC-119
• Serial Interface Naming Notation, page HC-119
• Cisco IOS XR PPP Encapsulation, page HC-120
• Cisco IOS XR HDLC Encapsulation, page HC-120
• Keepalive Timer, page HC-120