Troubleshoot and ensure that branch B only ever uses the MPLS B network to reach HQ. Which action achieves this requirement?
A.
Introduce an AS path filter on branch A routers so that only local prefixes are advertised into BGP
B.
increase the local preference for all HQ prefixes received at branch B from the MPLS B network to be higher than the local preferences used on the MPLS A network
C.
Introduce AS path prepending on the branch A MPLS B network connection so that any HQ advertisements from branch A toward the MPLS B network are prepended three times
D.
Modify the weight of all HQ prefixes received at branch B from the MPLS B network to be higher than the weights used on the MPLS A network
If we modify the weight, increase local preference or use AS path prepending then we can only
make MPLS B prefer over MPLS A. But when MPLS B is down then MPLS A will be used which
does not meet the requirement of this question. Only with AS path filtering we can deny prefixes
from certain AS and make sure branch B never uses MPLS A to reach HQ.
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