1. link-down-failover (A)
This setting ensures that BGP reacts quickly to a link failure.
If a physical link goes down, the BGP session is immediately terminated instead of waiting for hold timers to expire.
This speeds up routing convergence by allowing faster failover to alternate paths.
2. holdtime-timer (C)
The hold-time timer determines how long a router waits before declaring a BGP peer dead if no keepalives or updates are received.
Lowering the hold-time value speeds up failure detection and convergence.
A typical BGP hold-time is 180 seconds, but reducing it to 30 or 60 seconds improves responsiveness.
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