Tag :: EPE

Normally, an ingress router has no control over an autonomous system border router’s (ASBR) selection of inter-AS links. In the example below, Peer 2 and Peer 3 both advertise reachability to some remote network to ASBR 1 (e.g. service route 172.16.1.0/24). ASBR 1 would then use normal bestpath selection rules to select a preferred egress path (for traffic flowing to that service route). However, this means that the ingress router has no control over which egress path is chosen.

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Normally the ingress router in the following diagram has no control over an autonomous system border router’s

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Egress Peer Engineering (EPE) using BGP LU enables traffic engineering of the links between Autonomous Systems

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