Cisco ASR 9000 Series Configuration Guide

Interface Address Family Configuration Mode
The following example shows how to enter interface address family configuration mode:
RP/0/RSP0/CPU0:router(config)# router isis isp
RP/0/RSP0/CPU0:router(config-isis)# interface
GigabitEthernet 0 /3/0/0
RP/0/RSP0/CPU0:router(config-isis-if)# address-family ipv4 unicast
RP/0/RSP0/CPU0:router(config-isis-if-af)#
IS-IS Interfaces
IS-IS interfaces can be configured as one of the following types:
• Active—advertises connected prefixes and forms adjacencies. This is the default for interfaces.
• Passive—advertises connected prefixes but does not form adjacencies. The passive command is used
to configure interfaces as passive. Passive interfaces should be used sparingly for important prefixes
such as loopback addresses that need to be injected into the IS-IS domain. If many connected prefixes
need to be advertised then the redistribution of connected routes with the appropriate policy should be
used instead.
• Suppressed—does not advertise connected prefixes but forms adjacencies. The suppress command is
used to configure interfaces as suppressed.
• Shutdown—does not advertise connected prefixes and does not form adjacencies. The shutdown
command is used to disable interfaces without removing the IS-IS configuration.
Multitopology Configuration
The software supports multitopology for IPv6 IS-IS unless single topology is explicitly configured in IPv6
address-family configuration mode.
IS-IS supports IP routing and not Open Systems Interconnection (OSI) Connectionless Network Service
(CLNS) routing.
Note
IPv6 Routing and Configuring IPv6 Addressing
By default, IPv6 routing is disabled in the software. To enable IPv6 routing, you must assign IPv6 addresses
to individual interfaces in the router using the ipv6 enable or ipv6 address command. See the Network Stack
IPv4 and IPv6 Commands on Cisco ASR 9000 Series Router module of Cisco ASR 9000 Series Aggregation
Services Router IP Addresses and Services Command Reference.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
276 OL-30423-03
Implementing IS-IS
IS-IS Interfaces

Cisco ASR 9000 Series Specifications

General

Brand	Cisco
Model	ASR 9000 Series
Category	Network Router
Language	English