Indicating Bgp Back-Door Routes - Cisco NCS 6000 Series Configuration Manual

Implementing BGP
Command or Action
Step 2 router bgp as-number
Example:
RP/0/RP0/CPU0:router(config)# router bgp 126
Step 3
bgp bestpath med missing-as-worst
Example:
RP/0/RP0/CPU0:router(config-bgp)# bgp bestpath med
missing-as-worst
Step 4
bgp bestpath med always
Example:
RP/0/RP0/CPU0:router(config-bgp)# bgp bestpath med
always
Step 5
bgp bestpath med confed
Example:
RP/0/RP0/CPU0:router(config-bgp)# bgp bestpath med
confed
Step 6
bgp bestpath as-path ignore
Example:
RP/0/RP0/CPU0:router(config-bgp)# bgp bestpath
as-path ignore
Step 7
bgp bestpath compare-routerid
Example:
RP/0/RP0/CPU0:router(config-bgp)# bgp bestpath
compare-routerid
Step 8
commit

Indicating BGP Back-door Routes

Perform this task to set the administrative distance on an external Border Gateway Protocol (eBGP) route to
that of a locally sourced BGP route, causing it to be less preferred than an Interior Gateway Protocol (IGP)
route.
SUMMARY STEPS
1. configure
2. router bgp as-number
3. address-family { ipv4 | ipv6 } unicast
Purpose
Specifies the autonomous system number and enters the
BGP configuration mode, allowing you to configure the
BGP routing process.
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.
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.
Enables BGP software to compare MED values for paths
learned from confederation peers.
Configures the BGP software to ignore the autonomous
system length when performing best-path selection.
Configure the BGP speaker in the autonomous system to
compare the router IDs of similar paths.
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
Indicating BGP Back-door Routes
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