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Enabling IP CEF

jeffbriones
Level 1
Level 1

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 6

sivakondalarao
Level 1
Level 1

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

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

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

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

mheusinger
Level 10
Level 10

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

mheusinger
Level 10
Level 10

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

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