BGP route target filtering reduces the number of routers that receive VPN routes and route updates, helping to limit the amount of overhead associated with running a VPN. BGP route target filtering is most effective at reducing VPN-related administrative traffic in networks where there are many route reflectors or AS border routers that do not participate in the VPNs directly (do not act as PE routers for the CE devices).
Figure 3 illustrates the topology for a network configured with BGP route target filtering for a group of VPNs.
Figure 3: BGP Route Target Filtering Enabled for a Group of VPNs
The following sections describe how to configure BGP route target filtering for a group of VPNs:
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