Click the Exhibit button. You receive the same 75.100.0.0/16 route from all four ISPs to which you are connected. Referring to the exhibit, which ISP's route will be selected as active?
In order, the selection process in JUNOS is: (think of this is a tie-breaking process)
1) next-hop is reachable
2) highest local-pref
3) shortest AS-path
4) best origin (IGP, then EGP, then unknown)
5) smallest MED
6) ebgp routes before ibgp
7) smallest IGP metric to next-hop
😎 if iBGP route-reflectors are used the shortest cluster-list
9) smallest router-id
10) smallest numerical peer-address
The following parameters are followed for BGP's path selection:
Prefer the highest local-preference value.
Prefer the shortest AS-path length.
Prefer the lowest origin value.
Prefer the lowest MED value.
Prefer routes learned from an EBGP peer over an IBGP peer.
Prefer best exit from AS.
For EBGP-received routes, prefer the current active route.
Prefer routes from the peer with the lowest Router ID.
Prefer paths with the shortest cluster length.
Prefer routes from the peer with the lowest peer IP address. Steps 2, 6 and 12 are the RPD criteria.
https://www.juniper.net/documentation/en_US/junos/topics/reference/general/routing-protocols-address-representation.html
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