route-cache

[The_guroo_2]

why we use ip route-cache ....command what is its purpose and why we normally disable it with no ip route-cache.....thanks in advance

[Edison Ortiz]

ip route-cache enables fast switching on an interface while no ip route-cache enables process switching.

There are times when process switching is needed for full packet inspection.

[The_guroo_2]

thanks for your help guys but can u plz explain whast the difference between fast switching and nrmal swiches....like some senario based if possible........cheers and when it is needed

[Edison Ortiz]

I guess our words were not enough ? :)

Here is Cisco's response

http://www.cisco.com/warp/public/105/20.html

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Please rate helpful posts.

Thanks

[rajinikanth]

Hi,

In addition to the previous posts..

Process switching forces the router to look in the routing table for the destination network of each routed packet. In contrast, fast switching performs a table lookup for the first packet only.

The router then stores the result in a high speed cache and uses the cached information to forward

all additional packets to the same destination.

Fast switching is the default setting. So we use the no ip route-cache command to make it perform as process switching.

Hope this helps you,

Thanks

Raj

[dpopli]

Hi,

You can also use this command on Interface for Network Monitoring or Network Managament.

You can configure Cisco IOS netflow using command Ip route-cache flow on an interface

You can see output of it using Sh ip cache flow which will display Source IP address, Destination IP address, Src port, Destination Port, packets/flow etc. This is a useful tool for monitoring your bandwidth utliation by diiferent protocols

As mantioned above this is enabled for fast switching

Pls rate if helpful

Cheers