A router has two paths to reach another network in a different autonomous system. Neither
route was generated by the local router and both routes have the same default weight and
local preference values.
Which statement is true about how BGP would select the best path? Select the best
response.
A.
If the command bgp always-compare-med has been given, then the router will prefer the
route with the highest MED.
B.
The router will prefer the route with the lower MED.
C.
The router will prefer the shortest autonomous system path.
D.
To influence one route to be preferred, its defaultlocal preference value will be changed
via the use of the command bgp default local-preference 50.
Explanation:
In the Route selection decision process, if the weight, local preference & route originated
are the same then the shortest AS path will be chosen.
The full Route selection decision process is listedbelow:
1. Prefer highest weight (local to router)
2. Prefer highest local preference (global within AS)
3. Prefer route originated by the local router (next hop = 0.0.0.0)
4. Prefer shortest AS path
5. Prefer lowest origin code (IGP < EGP )
6. Prefer lowest MED (exchanged between autonomous systems)
7. Prefer EBGP path over IBGP path
8. Prefer the path through the closest IGP neighbor(IGP cost)
9. Prefer oldest route for EBGP paths
10. Prefer the path with the lowest neighbor BGP router ID
11. Prefer the path with the lowest neighbor IP address