Cisco ASR 9000 Series Configuration Guide

DETAILED STEPS
PurposeCommand or Action
configure
Step 1
Enables IS-IS routing for the specified routing process, and places
the router in router configuration mode.
router isis instance-id
Example:
RP/0/RSP0/CPU0:router(config)# router isis
isp
Step 2
•
By default, all IS-IS instances are automatically Level 1 and
Level 2. You can change the level of routing to be performed
by a particular routing instance by using the is-type command.
(Optional) Sets the overload bit.
set-overload-bit [ on-startup { delay |
wait-for-bgp }] [ level { 1 | 2 }]
Step 3
The configured overload bit behavior does not apply to
NSF restarts because the NSF restart does not set the
overload bit during restart.
Note
Example:
RP/0/RSP0/CPU0:router(config-isis)#
set-overload-bit
Specifies the IPv4 or IPv6 address family, and enters router address
family configuration mode.
address-family { ipv4 | ipv6 } [ unicast ]
Example:
RP/0/RSP0/CPU0:router(config-isis)#
address-family ipv4 unicast
Step 4
(Optional) Injects a default IPv4 or IPv6 route into an IS-IS routing
domain.
default-information originate [ route-policy
route-policy-name ]
Step 5
Example:
RP/0/RSP0/CPU0:router(config-isis-af)#
default-information originate
•
The route-policy keyword and route-policy-name argument
specify the conditions under which the IPv4 or IPv6 default
route is advertised.
•
If the route-policy keyword is omitted, then the IPv4 or
IPv6 default route is unconditionally advertised at Level 2.
(Optional) Redistributes routes from one IS-IS instance into another
instance.
redistribute isis instance [ level-1 | level-2 |
level-1-2 ] [ metric metric ] [ metric-type {
internal | external }] [ policy policy-name ]
Step 6
•
In this example, an IS-IS instance redistributes Level 1 routes
from another IS-IS instance.
Example:
RP/0/RSP0/CPU0:router(config-isis-af)#
redistribute isis 2 level-1
(Optional) Allows a Level 1-2 router to summarize Level 1 IPv4
and IPv6 prefixes at Level 2, instead of advertising the Level 1
prefixes directly when the router advertises the summary.
Do one of the following:
Step 7
•
summary-prefix address / prefix-length [
level { 1 | 2 }]
•
This example specifies an IPv4 address and mask.
•
summary-prefix ipv6-prefix / prefix-length
[ level { 1 | 2 }]
or
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
312 OL-30423-03
Implementing IS-IS
Customizing Routes for IS-IS

Cisco ASR 9000 Series Specifications

General

Brand	Cisco
Model	ASR 9000 Series
Category	Network Router
Language	English