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Implementing BGP on Cisco IOS XR Software
How to Implement BGP on Cisco IOS XR Software
RC-105
Cisco IOS XR Routing Configuration Guide
OL-14356-01
Configuring BGP as a PE-CE Protocol
Perform this task to configure BGP on the PE and establish PE-CE communication using BGP.
SUMMARY STEPS
1. configure
2. router bgp as-number
3. vrf vrf-name
4. bgp router-id ip-address
5. label-allocation-mode per-ce
6. address-family {ipv4 | ipv6} unicast
7. network {ip-address/prefix-length | ip-address mask}
8. aggregate-address address/mask-length
9. exit
10. neighbor ip-address
11. remote-as as-number
12. password {clear | encrypted} password
Step 4
retain route-target {all | route-policy
route-policy-name}
Example:
RP/0/RP0/CPU0:router(config-bgp-af)# retain
route-target route-policy rr_ext-comm
Configures a reflector to retain routes tagged with particular
RTs. Use the route-policy-name argument for the policy
name that lists the extended communities that a path should
have in order for the RR to retain that path.
Note The all keyword is not required, because this is the
default behavior of a route reflector.
Step 5
end
or
commit
Example:
RP/0/RP0/CPU0:router(config-bgp-nbr-af)# end
or
RP/0/RP0/CPU0:router(config-bgp-nbr-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.
Command or Action Purpose