Identifying Ports

You can add a text description to a switch port

IS-IS and Default Routes

The purpose of the default route in any routing protocol is to forward traffic to destinations that are not in the router's routing table. It is not possible for all the routers in a network to have full Internet routes. For this purpose, routers without full routes to all the destinations forward t...

Frame Relay PIPQ

The remaining sections of this chapter focus on the Frame Relay PIPQ feature. The Frame Relay PIPQ feature works by providing a PQ scheme at the interface level. Similar to the generic PQ feature enabled at the interface level for nonserial interfaces or other encapsulation types, the Frame Relay PI...

Summarizing Routes in OSPF

Using the area x range configuration command on your ABRs allows you summarize routes between OSPF areas: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#router ospf 55 Router1(config-router)#area 100 range 172.20.0.0 255.255.0.0 R...

Special Rules Concerning Intra-area and Interarea Routes on ABRs

OSPF has a couple of rules concerning intra-area and interarea routes that take precedence over the simple comparison of the cost calculated for the various routes. The issue exists when more than one ABR connects to the same two areas. Many designs use two routers between the backbone and each no...

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