Specifications

Implementing BGP on Cisco IOS XR Software
How to Implement BGP on Cisco IOS XR Software
RC-55
Cisco IOS XR Routing Configuration Guide
Tuning the BGP Best-Path Calculation
Perform this task to change the default BGP best-path calculation behavior.
SUMMARY STEPS
1. configure
2. router bgp as-number
3. bgp bestpath med missing-as-worst
4. bgp bestpath med always
5. bgp bestpath med confed
6. bgp bestpath as-path ignore
Step 5
address-family {ipv4 unicast | ipv4 multicast |
ipv4 labeled-unicast | ipv4 tunnel | ipv4 mdt |
ipv6 unicast | ipv6 multicast | ipv6
labeled-unicast | vpnv4 unicast | vpnv6
unicast}
Example:
RP/0/RP0/CPU0:router(config-bgp-nbr)#
address-family ipv4 unicast
Enters neighbor address family configuration mode for the
specified address family.
Step 6
weight weight-value
Example:
RP/0/RP0/CPU0:router(config-bgp-nbr-af)# weight
41150
Assigns a weight to all routes learned through the neighbor.
Step 7
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