IP prefix lists provide mechanisms to match two components of an IP route: ■ The route prefix (the subnet number) ■ The prefix length (the subnet mask) The redistribute command cannot directly reference a prefix list, but a route map can refer to a prefix list by using the match command. A prefix list itself has similar characteristics to a route map. The list consists of one or more statements with the same text name. Each statement has a sequence number to allow delet..
"Understanding Protocol Independent Multicast (PIM)," IGMP joins are a line of communication between the multicast receiver (host) and the router. IGMP joins are used by the multicast receiver to inform the multicast router that hosts on the local segment are interested in certain multicast groups; this allows the router to forward multicast packet to the segment. This section discusses issues with IGMP joins. Refer to Figure 13-1 for the troubleshooting flowchart on IGMP joi..
The Level 2 capable routers in Figure 7-13 contain all the specific routes in their IP routing tables. For example, Router E has 18 specific routes in Example 7-18. Example 7-18. IS-IS Routes in the IP Routing Table of Router E E#show ip route | include L2 i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area i L2 156.26.2.0 [115/31] via 172.16.15.161, Serial0/0 i L2 156.26.3.0 [11..
A campus network’s core layer provides connectivity of all distribution-layer devices. The core, sometimes referred to as the backbone, must be capable of switching traffic as efficiently as possible. Core devices, sometimes called campus backbone switches, should have the following attributes: ■ Very high throughput at Layer 3 ■ No costly or unnecessary packet manipulations (access lists, packet filtering) ■ Redundancy and resilience for high availability ■ Advanc..
In its simplest configuration, BGP exchanges routes between a router in one AS and another router in a different AS. The first router is in AS 65500: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#interface Serial0 Router1(config-if)#ip address 192.168.55.6 255.255.255.252 Router1(config-if)#exit Router1(config)#router bgp 65500 Router1(config-router)#network 192.168.1.0 Router1(config-router)#neighbor 192.168.55..
