![]() ![]() A simple distance vector routing protocol (RIP or ODR) scales much better than OSPF (with obvious convergence drawbacks). OSPF can become a bottleneck in DMVPN designs with high spokes-per-hub ratio. Scaling DMVPN with Distance Vector Routing Protocols This section describes tunnel route-via feature introduced in IOS release 12.4(11)T and an alternate design that works well with encrypted traffic. Simplistic implementations of dual uplinks can easily fail if the ISPs perform strict source IP address checking (usually with Reverse Path Forwarding – RPF – mechanisms). This section presents several solutions to the default routing issues introduced with direct spoke-to-spoke tunnels, from policy routing to split default routing with Virtual Routing and Forwarding (VRF) tables.Ĭonnections to two Internet Service Providers are usually used to increase the availability of DMVPN spoke sites. Redundant network design with each spoke router being connected to two hub routers.Īfter describing the changes introduced by Phase 2 DMVPN (dynamic spoke-to-spoke tunnels) and their impact on routing protocol design (OSPF, EIGRP and BGP), this section details the default routing issues caused by IPSec tunnels established with unknown destination addresses and the shared IPSec protection profile caveats. ![]()
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