Why do we use LOOPBACK in BGP?

5 pts.
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BGP
Loopback
In BGP, when there is more than one path between tow routers, why do we use LOOPBACK?

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A loopback interface always remains up and thus keeps the peering established as long as there is one link available to reach the peer. With multiple links between two routers, if physical interface is used for peering and that interface goes down then the peering will break even with another link up.

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