Implementing IS-IS on Cisco IOS XR Software
How to Implement IS-IS on CiscoIOS XR Software
RC-305
Cisco IOS XR Routing Configuration Guide
OL-14356-01
Step7 summary-prefix address/prefix-length [level {1
| 2}]
or
summary-prefix ipv6-prefix/prefix-length [level
{1 | 2}]
Example:
RP/0/RP0/CPU0:router(config-isis-af)#
summary-prefix 10.1.0.0/16 level 1
or
RP/0/RP0/CPU0:router(config-isis-af)#
summary-prefix 3003:xxxx::/24 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.
•This example specifies an IPv4 address and mask.
or
•This example specifies an IPv6 prefix, and the
command must be in the form documented in RFC 2373
in which the address is specified in hexadecimal using
16-bit values between colons.
•Note that IPv6 prefixes must be configured only in the
IPv6 router address family configuration submode, and
IPv4 prefixes in the IPv4 router address family
configuration submode.
Step8 maximum-paths route-number
Example:
RP/0/RP0/CPU0:router(config-isis-af)#
maximum-paths 16
(Optional) Configures the maximum number of parallel
paths allowed in a routing table.
Step9 distance weight [address/prefix-length
[route-list-name]]
Example:
RP/0/RP0/CPU0:router(config-isis-af)# distance
90
(Optional) Defines the administrative distance assigned to
routes discovered by the IS-IS protocol.
•A different administrative distance may be applied for
IPv4 and IPv6.
Command or Action Purpose