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How-to:Configure RIP route summarization

In the following example I am going to show you how to configure route summarization under RIP using two methods. Our topology is shown below: R1 routing table before implementing summarization: R1(config-router)#do sh ip route rip is subnetted, 4 subnets R [120/1] via, 00:00:02, Serial1/0 R [120/1] via, 00:00:02, Serial1/0 R [120/1] via, 00:00:02, Serial1/0 R [120/1] via, 00:00:02, Serial1/0 Task: Summarize Lo0,Lo1 and Lo2 interfaces of R2 when sent to R1 using two methods. Method1: IP summary-address command This command is applied under the interface you want to generate the …

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Passive-interface command behavior in RIP, EIGRP & OSPF

Passive-interface command is used in all routing protocols to disable sending updates out from a specific interface. However the command behavior varies from o­ne protocol to another. In RIP this command will disable sending multicast updates via a specific interface but will allow listening to incoming updates from other RIP speaking neighbors. This simply means that the router will still be able to receive updates o­n that passive interface and use them in the routing table. In EIGRP the passive-interface command stops sending outgoing hello packets, hence the router can not form any neighbor relationship via the passive interface. This …

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Automatic summarization in RIP and EIGRP

Summarization in RIP and EIGRP can be configured manually using the ip summary-address command or automatically using auto-summary command. when auto summarization is in effect routers behave as shown in the steps below: Subnets are summarized to their classful boundary before being sent to neighbors if they are not part of the major subnet of the exit interface. EIGRP automatically installs a discard route in the local routing table. RIP does not install a discard route by default. In the following example we will explore EIGRP with automatic summarization enabled: Router1 is connected to Router2 by a serial link and …

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