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Implementing IS-IS on Cisco IOS XR Software
Information About Implementing IS-IS on Cisco IOS XR Software
RC-268
Cisco IOS XR Routing Configuration Guide
OL-14356-01
• Single topology IPv6
• Multitopology
• Nonstop forwarding (NSF), both Cisco proprietary and IETF
• Three-way handshake
• Mesh groups
• Multiple IS-IS instances
• Configuration of a broadcast medium connecting two networking devices as a point-to-point link
• Fast-flooding with different threads handling flooding and shortest path first (SPF).
Note For information on IS-IS support for Bidirectional Forwarding Detection (BFD), see Cisco IOS XR
Interface and Hardware Configuration Guide and Cisco IOS XR Interface and Hardware Command
Reference.
IS-IS Configuration Grouping
Cisco IOS XR groups all of the IS-IS configuration in router IS-IS configuration mode, including the
portion of the interface configurations associated with IS-IS. To display the IS-IS configuration in its
entirety, use the show running router isis command. The command output displays the running
configuration for all configured IS-IS instances, including the interface assignments and interface
attributes.
IS-IS Configuration Modes
The following sections show how to enter each of the configuration modes. From a mode, you can enter
the ? command to display the commands available in that mode.
Router Configuration Mode
The following example shows how to enter router configuration mode:
RP/0/RP0/CPU0:router# configuration
RP/0/RP0/CPU0:router(config)# router isis isp
RP/0/RP0/CPU0:router(config-isis)#
Router Address Family Configuration Mode
The following example shows how to enter router address family configuration mode:
RP/0/RP0/CPU0:router(config)# router isis isp
RP/0/RP0/CPU0:router(config-isis)# address-family ipv6 unicast
RP/0/RP0/CPU0:router(config-isis-af)#
Interface Configuration Mode
The following example shows how to enter interface configuration mode:
RP/0/RP0/CPU0:router(config)# router isis isp
RP/0/RP0/CPU0:router(config-isis)# interface POS0/3/0/0
RP/0/RP0/CPU0:router(config-isis-if)#