Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Enabling IP CEF

Hi guys,

I would like know if enabling ip cef on my 7206 router with ios version 12.18E has great impact in terms of performance. Is there any advantage and disadvantage enabling this feature ?

thanks.

jeff

6 REPLIES
New Member

Re: Enabling IP CEF

it will allow the router to " fast switching " and it will not degrade the performance

Re: Enabling IP CEF

Hello,

commonly "fast-switching" is refered to as cache based, whereas CEF is topology based. In brief: CEF is superior with respect to performance. Some features like NBAR and MPLS even require CEF to be turned on. Turning on CEF will turn off fast-switching. The "price" is higher memory utilization for the additional topology information, the cef table.

Hope this helps! Please rate all posts.

Regards, Martin

Re: Enabling IP CEF

Hello,

commonly "fast-switching" is refered to as cache based, whereas CEF is topology based. In brief: CEF is superior with respect to performance. Some features like NBAR and MPLS even require CEF to be turned on. Turning on CEF will turn off fast-switching. The "price" is higher memory utilization for the additional topology information, the cef table.

Hope this helps! Please rate all posts.

Regards, Martin

Re: Enabling IP CEF

Hello,

commonly "fast-switching" is refered to as cache based, whereas CEF is topology based. In brief: CEF is superior with respect to performance. Some features like NBAR and MPLS even require CEF to be turned on. Turning on CEF will turn off fast-switching. The "price" is higher memory utilization for the additional topology information, the cef table.

Hope this helps! Please rate all posts.

Regards, Martin

Re: Enabling IP CEF

Hello,

commonly "fast-switching" is refered to as cache based, whereas CEF is topology based. In brief: CEF is superior with respect to performance. Some features like NBAR and MPLS even require CEF to be turned on. Turning on CEF will turn off fast-switching. The "price" is higher memory utilization for the additional topology information, the cef table.

Hope this helps! Please rate all posts.

Regards, Martin

Re: Enabling IP CEF

Hello,

commonly "fast-switching" is refered to as cache based, whereas CEF is topology based. In brief: CEF is superior with respect to performance. Some features like NBAR and MPLS even require CEF to be turned on. Turning on CEF will turn off fast-switching. The "price" is higher memory utilization for the additional topology information, the cef table.

Hope this helps! Please rate all posts.

Regards, Martin

261
Views
0
Helpful
6
Replies