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Implementing IS-IS on Cisco IOS XR Software
How to Implement IS-IS on Cisco IOS XR Software
RC-305
Cisco IOS XR Routing Configuration Guide
OL-14356-01
Step 7
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.
Step 8
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.
Step 9
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