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Implementing BGP on Cisco IOS XR Software
How to Implement BGP on Cisco IOS XR Software
RC-91
Cisco IOS XR Routing Configuration Guide
OL-14356-01
Configuring Software to Store Updates from a Neighbor
Perform this task to configure the software to store updates received from a neighbor.
The soft-reconfiguration inbound command causes a route refresh request to be sent to the neighbor if
the neighbor is route refresh capable. If the neighbor is not route refresh capable, the neighbor must be
reset to relearn received routes using the clear bgp soft command. See the “Resetting Neighbors Using
BGP Inbound Soft Reset” section on page RC-120.
Note Storing updates from a neighbor works only if either the neighbor is route refresh capable or the
soft-reconfiguration inbound command is configured. Even if the neighbor is route refresh capable and
the soft-reconfiguration inbound command is configured, the original routes are not stored unless the
always option is used with the command. The original routes can be easily retrieved with a route refresh
request. Route refresh sends a request to the peer to resend its routing information. The
soft-reconfiguration inbound command stores all paths received from the peer in an unmodified form
and refers to these stored paths during the clear. Soft reconfiguration is memory intensive.
SUMMARY STEPS
1. configure
2. router bgp as-number
3. neighbor ip-address
Step 7
end
or
commit
Example:
RP/0/RP0/CPU0:router(config-bgp-af)# end
or
RP/0/RP0/CPU0:router(config-bgp-af)# 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.
Step 8
show bgp [vrf vrf-name] ip-address
Example:
RP/0/RP0/CPU0:router# show bgp 172.168.40.24
Displays the cost community in the following format:
Cost:<POI>:<cost community ID>:<cost number>
Command or Action Purpose