CCIE

Sooner or later somebody decides the network is moving from EIGRP to OSPF. Maybe a merger brought in a multi-

Redistribution between two routing protocols at a single point is easy. Redistribution between two routing protocols at two points is

EIGRP over DMVPN works beautifully, right up until the moment you realise none of your spokes can reach any of

You have two hubs. You want every spoke to prefer HUB1 and fall back to HUB2 only when HUB1 is

Summarisation is a trade. You send one prefix instead of fifty, which shrinks the routing table and hides internal churn

A branch office with two WAN routers is a good design. Two routers, two circuits, no single point of failure.