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New Member

summarizing routes in an existing routing table

What is the best method to summarize routes in an existing routing table. This is a production network and work will be done during a maitenance window.

I am trying to get the step by step proces if possible.

Thanks

5 REPLIES
Hall of Fame Super Gold

Re: summarizing routes in an existing routing table

Well it depends on what you're trying to do.

If you want to reduce routes you've in a router, you can't do that once the routes have arrived already. So what you do, you use routes summarization in the routing protocols, the details varies by the protocol used and toplogy.

Generally nowadays route summarization is not much necessary anymore because routers are fast and have ample memory.

New Member

Re: summarizing routes in an existing routing table

So I guess I go and examine all the BGP routes...then go back into router configuration mode then specify the summarization of the networks in the routing network statements?. I that the stetp by step process?

Cisco Employee

Re: summarizing routes in an existing routing table

Which routing protocol is running ?

-amit singh

New Member

Re: summarizing routes in an existing routing table

The routing protocols I will be summarizing are BGP and EIGRP. I will also have to aggregate the announcements of the summarize BGP routes as well.

Re: summarizing routes in an existing routing table

Hi,

I dont think there is a way to summarize routes already there in the routing table.

As For Eigrp, you can by issuing (Auto-summary) under the Eigrp process, but this will bring Eigrp Adjacencies down for a while.

As For BGP, u can configure (Aggregation) to keep faciltate the Global BGP table Smaller as Possible. (This is for BGP Announcment).

HTH

Mohamed

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