Routing Table-- Performance Issue

[gomesrichard]

Hi All,

Is there any performance degradation for long routing table of a gate-way router? or

What is the performance issue for long routing table on gate-way router?

Thanks

richard

[Erick Bergquist]

How many routes are we talking about? What model router, processor, sup? How much DRAM?

More routes take up more memory. For example if your taking a full BGP feed you will need 64meg (more likely 96 or 128) of DRAM.

Also, fast-switching / CEF , etc will help since the packet is routed the first time (process switched) and switched after that.

A couple thousand routes shoudn't be a issue or effect performance in current platforms. What routing protocol are you using? You may want to look at summarizing your routes if there are a lot.

[gomesrichard]

Hi,

Thanks for your reply.

Actually I am using very simple routing table. NO BGP, or any other routing protocol. Only static routes. My router is 2600 series, with 64meg dram.

Thanks

Richard

[donewald]

Richard,

The more routes you have and the more masks for those routes the more lookup time is required to find the appropriate next-hop. Routers have gotten very fast in doing this so unless you have 1000's of static entries your look up time would be almost unmeasureable.

Hope this helps you,

Don

[gomesrichard]

Thanks Don.

Richard