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Implementing BGP on Cisco IOS XR Software
How to Implement BGP on Cisco IOS XR Software
RC-54
Cisco IOS XR Routing Configuration Guide
DETAILED STEPS
Command or Action Purpose
Step 1
configure
Example:
RP/0/RP0/CPU0:router# configure
Enters global configuration mode.
Step 2
router bgp
autonomous-system-number
Example:
RP/0/RP0/CPU0:router(config)# router bgp 120
Enters BGP configuration mode allowing you to configure
the BGP routing process.
Step 3
address-family {ipv4 unicast | ipv4 multicast |
ipv6 unicast | ipv6 multicast}
Example:
RP/0/RP0/CPU0:router(config-bgp)#
address-family ipv4 unicast
Enters global address family configuration mode for the
IPv4 address family.
Step 4
distance bgp
external-distance
internal-distance local-distance
Example:
RP/0/RP0/CPU0:router(config-bgp-af)# distance
bgp 20 20 200
Sets the external, internal, and local administrative
distances to prefer one class of routes over another. The
higher the value, the lower the trust rating. The
external-distance argument is set to 20, the
internal-distance argument is set to 20, and the
local-distance argument is set to 200.
Step 5
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.