CCIE

OSPF has an unhelpful habit: when you break it, it usually says nothing. An adjacency that should form simply does

Two routes to the same prefix. One has a metric of 20. The other has a metric of 31. Which

OSPF gives you four different ways to stop a prefix from getting somewhere, and they are not interchangeable. Two of

Here is a routing puzzle. An OSPF router has a route to an external network. The route is in the

You need to reload a core router. It is carrying live traffic. The naive approach - just reload it - drops every

Look at your routing table and count how many of those prefixes anyone actually sends traffic to. In a typical