Using IS-IS as the IGP

IS-IS is similar to OSPF; it uses the default-information originate router subcommand. In the configuration for RTA in Example 12-59, RTA originates a default into IS-IS only on the condition that RTA learns the default from its exterior link. Example 12-59. Using IS-IS as the IGP: RTA Configurat...

Triggered (Flash) Updates and Poisoned Routes

When RIP knows for sure that a route to a subnet has failed, RIPv2 can converge to an alternate route typically in less than a minute. Example 8-2 details the steps behind one such example, using Figure 8-1, with the steps outlined in the following list (the comments in Example 8-2 refer to these st...

Link-State Packets

Link-state packets are divided into two types: level 1 and level 2. Level 2 packets contain information about all the reachable prefixes within the IS-IS domain. The topology for level 1 packets is known for the local area only, so these packets are included in the level 1 LSP. Individual LSPs are i...

Configuring Basic NAT Functionality

In the simplest NAT configuration, all of your internal devices use the same external global address as the router's external interface: Router#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#access-list 15 permit 192.168.0.0 0.0.255.255 ...

Default Passive Interface

You can disable the sending of RIP updates on all interfaces with the passive-interface default command: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#router rip Router1(config-router)#passive-interface default Router1(config-route...

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