Multiple-Router Branch Sites
For sites with multiple routers, the configuration accommodates sites that have only downstream routers (Site 4) or multiple IWAN routers (Site 5). The multirouter site routing configuration uses mutual redistribution between the IGP and BGP so that it can accommodate both scenarios. Multisite routing design includes this logic:
Establish an IGP routing protocol for the LAN networks such as OSPF for the book’s sample scenario. The IGP should not be enabled on or advertise the DMVPN tunnel networks at the branch sites.
The BGP learned default route is advertised into the IGP routing protocol. This provides a default ...