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Implementing BGP on Cisco IOS XR Software
How to Implement BGP on Cisco IOS XR Software
RC-57
Cisco IOS XR Routing Configuration Guide
OL-14356-01
DETAILED STEPS
Command or Action Purpose
Step 1
configure
Example:
RP/0/RP0/CPU0:router# configure
Enters global configuration mode.
Step 2
router bgp as-number
Example:
RP/0/RP0/CPU0:router(config)# router bgp 126
Enters BGP configuration mode, allowing you to configure
the BGP routing process.
Step 3
bgp bestpath med missing-as-worst
Example:
RP/0/RP0/CPU0:router(config-bgp)# bgp bestpath
med missing-as-worst
Directs the BGP software to consider a missing MED
attribute in a path as having a value of infinity, making this
path the least desirable path.
Step 4
bgp bestpath med always
Example:
RP/0/RP0/CPU0:router(config-bgp)# bgp bestpath
med always
Configures the BGP speaker in the specified autonomous
system to compare MEDs among all the paths for the prefix,
regardless of the autonomous system from which the paths
are received.
Step 5
bgp bestpath med confed
Example:
RP/0/RP0/CPU0:router(config-bgp)# bgp bestpath
med confed
Enables BGP software to compare MED values for paths
learned from confederation peers.
Step 6
bgp bestpath as-path ignore
Example:
RP/0/RP0/CPU0:router(config-bgp)# bgp bestpath
as-path ignore
Configures the BGP software to ignore the autonomous
system length when performing best-path selection.