Explains available configuration modes for IS-IS routing, detailing different methods for managing and applying IS-IS settings within Cisco IOS XR.
IS-IS routing in Cisco IOS XR utilizes several hierarchical configuration modes that organize routing setup and protocol parameters. Understanding the function and attributes of each mode enables efficient IS-IS configuration and troubleshooting.
IS-IS configuration modes overview
| Configuration mode | Purpose | Entry command example | Key Attributes |
|---|---|---|---|
| Router Configuration Mode | Start IS-IS process and set global options | configuration → router isis <name> | Global IS-IS settings, process name, global enablement |
| Router Address Family Configuration Mode | Set protocol parameters for address families | router isis <name> → address-family ipv4 unicast | IPv4/IPv6 selection, multicast/unicast options, address-family features |
| Interface Configuration Mode | Apply IS-IS to router interfaces | router isis <name> → interface GigabitEthernet 0/3/0/0 | Interface selection, IS-IS activation, interface-specific options |
| Interface Address Family Configuration Mode | Fine-tune address-family options per interface | interface ... → address-family ipv4 unicast | Address-family, per-interface features, parameter customization |
Example configuration commands
These examples illustrate how to enter each IS-IS configuration mode.
-
Router configuration mode
Router# configure Router(config)# router isis isp Router(config-isis)# -
Router address family configuration mode
Router(config)# router isis isp Router(config-isis)# address-family ipv4 unicast Router(config-isis-af)# -
Interface configuration mode
Router(config)# router isis isp Router(config-isis)# interface GigabitEthernet 0/3/0/0 Router(config-isis-if)# -
Interface address family configuration mode
Router(config)# router isis isp Router(config-isis)# interface GigabitEthernet 0/3/0/0 Router(config-isis-if)# address-family ipv4 unicast Router(config-isis-if-af)#
Configuration hierarchy overview
These configuration modes are nested and hierarchical, enabling modular configuration from global IS-IS settings down to per-interface and per-address-family details. This approach ensures protocol flexibility and tailored routing optimization in Cisco IOS XR environments.