Refer to the exhibit. In Cisco DNA Center, a network engineer identifies that BGP-learned networks are repeatedly withdrawn from peers. Which configuration must the engineer apply to resolve the issue?
A.
router bgp 100 bgp dampening
B.
router bgp 100 bgp graceful-restart
C.
route-map Dampening permit 10 set dampening 15 750 2000 60 router bgp 100 neighbor 10.140.212.5 route-map Dampening out
D.
route-map Dampening permit 10 set dampening 15 750 2000 60 router bgp 100 neighbor 10.140.212.5 route-map Dampening in
100% A .
Check the following links :
1) https://networklessons.com/bgp/bgp-route-dampening
2) https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/15-mt/irg-15-mt-book/irg-int-features.html#GUID-9CC2C114-3632-4D1D-9C92-8A1E4DF59061
3) https://networkengineering.stackexchange.com/questions/72994/change-bgp-dampening-parameters-for-a-specific-neighbor
4) https://networkengineering.stackexchange.com/questions/72994/change-bgp-dampening-parameters-for-a-specific-neighbor
Furthermore , tested in GNS3 . A works fine . Tried to configure D , error shown
"% "Dampening" used as BGP inbound route-map, set dampening not supported"
The correct answer is D because the issue in the question describes BGP routes being "repeatedly withdrawn." This typically indicates route flapping, where routes are constantly being advertised and withdrawn due to instability. BGP route dampening is used to reduce the impact of such instability by suppressing routes that are frequently flapping. Neighbor route-map Dampening in: The key here is applying the dampening "in", which applies it to the incoming routes from the neighbor. This helps prevent the local router from flapping routes and constantly withdrawing them from the peers.
I will use only Option A in scenarios in where I want to keep it simple. Anyways will go with D
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