Which role does the router ID (RID) have in the BGP route selection process?
A.
The router ID is evaluated immediately after MED to determine route preference
B.
The router ID is evaluated last in the route selection process
C.
The router ID is evaluated after the cluster length and a lower router ID is chosen
D.
The router ID is evaluated after analyzing the IGP metric cost
Explanation:
http://www.juniper.net/techpubs/en_US/junos10.0/information-products/topic-collections/nogbaseline/bgp-routes-and-selection-introduction.html
It can be B too. lowest peer ID is the last tie breaker.
Why not answer D?
http://www.juniper.net/techpubs/en_US/junos12.3/topics/reference/general/routing-ptotocols-address-representation.html
“Prefer the path from the peer with the lowest router ID. For any path with an originator ID attribute, substitute the originator ID for the router ID during router ID comparison.
Prefer the path with the shortest cluster list length. The length is 0 for no list.”
I thought cluster list length comparison is after RID comparison?
http://www.juniper.net/techpubs/en_US/junos10.0/information-products/topic-collections/nog-baseline/bgp-routes-and-selection-introduction.html
the correct answer is C, no worry about this!