Exam 350-501 topic 1 question 85 discussion

In order : 1. Veryfy that the next hop is reachable 2. Perfer the path with highest weight 3. Prefer the path with highest LOCAL_PREF(100 by default) 4. Prefer the path that was originated locally or through redistribution from an IGP 5. Prefer the path with the smaller AIGP 6. Prefer the path with the shortest AS_PATH 7. Prefer the path with the lowest origin type 8. Prefer the path with the lowest MED 9. Prefer eBGP over iBGP paths 10. Prefer the path with the lowest IGP metric to the BGP next hop 11. Determine if multiple paths require installation in routing table 12. Prefer the path that was received first (Oldest) 13. Prefer the route that comes from the BGP router with the lowest router ID 14. Prefer the path with the minimum cluster list length 15. Prefer the path that comes from the lowest neighbor address

50.50.50.2 - recognised as best, (4 available, best #1) 40.40.40.2 - out of 3 left, LocalPref 200 beats 100 (set for 20.20.20.2 and 30.30.30.2) 20.20.20.2 - out of 2 left, AS_PATH is shorter here, [200 i] beats [300 300 i] 30.30.30.2- last choice

This is Correct BGP Table path selection 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. ref https://www.juniper.net/documentation/en_US/junos/topics/reference/general/routing-protocols-address-representation.html#jd0e305