You can add a text description to a switch port’s configuration to help identify it. This description is meant as a comment field only, as a record of port use or other unique information. The port description is included when displaying the switch configuration and interface information. To assign a comment or description to a port, enter the following command in interface configuration mode: Switch(config-if)# description description-string The descri..
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 traffic to the default originating router. Level 1 routers never maintain information about any destination that is outside their area, so all level 1 routers merely s..
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 PIPQ feature provides four queues of ascending levels of priority: low, normal, medium, and high. NOTE The Frame Relay PIPQ feature is supported in Cisco IOS Release 12.1(1)T and l..
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 Router1(config-router)#area 0 range 172.25.0.0 255.255.0.0 Router1(config-router)#area 2 range 10.0.0.0 255.0.0.0 Router1(config-router)#exit Router1(config)#end Router1# The easiest way..
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 nonbackbone area for redundancy, so this design occurs in many OSPF networks. The issue relates to the fact that with two or more ABRs, the ABRsthemselves, when calculating their own ..
