is there a maximum number of routes in ip CEF?

[blacktulip]

what is the maximum number of default routes i can use with ip cef? if there is no maximum, is there a recommended number for the cpu to work ok or something?

[Amit Singh]

What is the hardware you are using. It depends on what kind of router/hardware used. For example Sup720-3B on Cat6500 supports 192,000 routes.

-amit singh

[blacktulip]

3845

[royalblues]

Friend,

Do you want to know how many FIB entries are possible or how many default route entries?

I have successfully used 9 default routes and all the entries were there in the CEF FIB table. I couldn't find a document stating the max supported though

MS_OBELIX_NOD_R01#sh ip cef

Prefix Next Hop Interface

0.0.0.0/0 10.255.252.149 Serial1/1/0:0

10.255.252.145 Serial1/0/0:0

10.255.252.29 Serial0/3/0:0

10.255.252.25 Serial0/0/0:0

10.255.252.21 Serial0/2/0:0

10.255.252.17 Serial0/1/0:0

10.254.0.57 Serial0/1/1:0

10.254.0.53 Serial0/2/1:0

10.254.0.49 Serial0/0/1:0

0.0.0.0/32 receive

The numbers will definitely increase if you have some links bundled using multilink

HTH, rate if it does

Narayan

[Richard Burts]

Amit

You give a very good answer about the maximum number of routes, but I believe that the original question was the number of default routes that can be used. Is the answer to that not the value of max-paths? max-paths traditionally has been 6 and I believe in some versions it is now 16.

HTH

Rick

[Amit Singh · Accepted solution]

Rick,

Thanks for pointing that out. Sorry, I overlooked the original post. Yes, it depends on the max-paths values to have the maximum routes for the same destination. As I know, max

paths in global ip routing table is 6 on most of the releases, however, its been made to 16 starting from 12.3 IOS train. So the original poster can have maximum 16 default routes.

-amit singh

[blacktulip]

thank you both. i found the answer of max 6 default routes myself, apparently it wasn't the last version.

good to know i can use 16.