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Inter-AS Option C with Route Reflectors Overview
When the BGP/MPLS VPN peer is a route reflector (Figure 1), issue the neighbor next-hop-unchanged command to prevent the RR from rewriting the BGP next-hop attribute when the RR advertises routes to external neighbors. Issuing this command causes the VPN RR that is multihop peering with another RR in the AS to send the next hop unchanged for the VPN routes that it advertises.
Issuing this command automatically removes the neighbor next-hop-self configuration (enabled or disabled) on the peer or peer group.
Figure 1: Topology for Inter-AS Option C with Route Reflectors
