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Implementing OSPF on Cisco IOS XR Software
How to Implement OSPF on Cisco IOS XR Software
RC-169
Cisco IOS XR Routing Configuration Guide
Step 5
summary-prefix
address mask
[not-advertise]
[tag
tag
]
or
summary-prefix
ipv6-prefix
/
prefix-length
[not-advertise] [tag
tag
]
Example:
RP/0/RP0/CPU0:router(config-ospf)#
summary-prefix 10.1.0.0 255.255.0.0
or
RP/0/RP0/CPU0:router(config-router)#
summary-prefix 2010:11:22::/32
(Optional) Creates aggregate addresses for OSPF.
or
(Optional) Creates aggregate addresses for OSPFv3.
• This command provides external route summarization
of the non-OSPF routes.
• External ranges that are being summarized should be
contiguous. Summarization of overlapping ranges from
two different routers could cause packets to be sent to
the wrong destination.
• This command is optional. If you do not specify it, each
route is included in the link-state database and
advertised in LSAs.
• In the OSPFv2 example, the summary address 10.1.0.0
includes address 10.1.1.0, 10.1.2.0, 10.1.3.0, and so on.
Only the address 10.1.0.0 is advertised in an external
LSA.
• In the OSPFv3 example, the summary address
2010:11:22::/32 has addresses such as
2010:11:22:0:1000::1, 2010:11:22:0:2000:679:1, and
so on. Only the address 2010:11:22::/32 is advertised in
the external LSA.
Step 6
end
or
commit
Example:
RP/0/RP0/CPU0:router(config-ospf)# end
or
RP/0/RP0/CPU0:router(config-ospf)# commit
Saves configuration changes.
• When you issue the end command, the system prompts
you to commit changes:
Uncommitted changes found, commit them before
exiting(yes/no/cancel)?
[cancel]:
–
Entering yes saves configuration changes to the
running configuration file, exits the configuration
session, and returns the router to EXEC mode.
–
Entering no exits the configuration session and
returns the router to EXEC mode without
committing the configuration changes.
–
Entering cancel leaves the router in the current
configuration session without exiting or
committing the configuration changes.
• Use the commit command to save the configuration
changes to the running configuration file and remain
within the configuration session.
Command or Action Purpose