You can use route origin to prevent routes learned from one customer edge (CE) router marked with origin community from being advertised back to it from another CE router in the same AS.
In the example, the route origin is used to prevent routes learned from CE Router A that are marked with origin community from being advertised back to CE Router E by AS 200. The example topology is shown in Figure 4.
Figure 4: Network Topology of Site of Origin Example
In this topology, CE Router A and CE Router E are in the same AS (AS200). They use external BGP (EBGP) to exchange routes with their respective provider edge (PE) routers, PE Router B and PE Router D. The two CE routers have a back connection.
The following sections describe how to configure the route origin for a group of VPNs:
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