BGP Policies Conflicting with the Internal Default

Anytime internal routers are following defaults to reach routes unknown to the AS, you should be careful not to create routing loops. A routing loop occurs when router X follows a default toward router Y, which in turn uses router X to reach the destination. The traffic will end up bouncing between ...

Common Problems with Adjacencies

Many OSPF problems stem from adjacency problems that propagate throughout the network. Problems are often traced back to neighbor discrepancies. The following guidelines are helpful in these situations.  If a router configured for OSPF routing is not seeing an OSPF neighbor on an attached netwo...

Introduction to Link-State Protocols

In the field of networking, we compare link-state protocols to jigsaw puzzles

Configuring Supervisor Synchronization

By default, the active supervisor synchronizes its startup configuration and configuration register values with the standby supervisor. You also can specify other information that should be synchronized. First, use the following commands to enter the main-cpu configuration mode: Router(config)#...

EIGRP Neighborships

Like OSPF, EIGRP uses three major steps to achieve its goal of learning the best available loop-free routes: Step 1. Establish EIGRP neighbor relationships

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