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RIP Configuration - No auto-summary

Understand that Auto-summarization has number of advantages and it is default turn on in RIP configuration .

But , I cannot understand in the REAL WORLD , when we configure RIPv2 , why we need to turn off auto-sumarization ??? example :- Router(config-router)#no auto-summary ...

I did go through below article , I think below link tried to explain why need to turn off summarization on RIPv2 but I still cannot catch it ??

http://www.freeccnaworkbook.com/labs/section-7-configuring-routing-information-protocol/lab-7-8-configuring-rip-route-summarization/

Can someone use simple way to explain why we need to turn off ( disable ) summarization on RIPv2 configuration ??

ASKER CERTIFIED SOLUTION

Don Johnston

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bfason

Try this scenaria,

2 routers connected by a t1. The F0/0 port on router A is 10.1.1.1 and on Router B it's 10.2.2.2.

Rip would summarize the route to 10.0.0.0. Router A will see 10.0.0.0 as a connected network therefore never learning about router b's routes.

Don Johnston

That would only be true if the link between the two routers was NOT a 10.0.0.0 network.

SOLUTION

Otto_N

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Otto_N

kcn, have we answered your question, or do you want us to put this in another way?

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