Refer to the exhibit. Company XYZ BGP topology is as shown in the diagram. The interface on the LA router connected toward the 10.1.5.0/24 network is faulty and is going up and down, which affects…

BGP route dampening suppresses routes received from external peers after they cross a penalty threshold, but LA is the originator of 10.1.5.0/24, so dampening cannot be applied to its own locally originated prefix and instability would still propagate before any threshold is reached.

Route filtering applied by the Chicago router prevents Chicago from processing the flapping prefix, but all other routers in the BGP domain would still receive and react to the repeated BGP updates originating from LA.

When LA advertises an aggregate summary route covering 10.1.4.0/24, 10.1.5.0/24, and adjacent networks, the flapping of the 10.1.5.0/24 component subnet does not cause BGP update messages to propagate to the rest of the domain as long as at least one subnet in the aggregate remains reachable. Neighboring routers only see the stable aggregate prefix rather than the repeatedly withdrawing and re-advertising specific subnet. This makes route aggregation the most effective local solution to contain instability caused by a flapping interface.

Route filtering by LA to block 10.1.5.0/24 from being advertised would make the network permanently unreachable to the entire domain rather than stabilizing the routing updates caused by the interface flap.