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High cpu when change "mls cef maximum-route ip" to more than 512K

Dear All

From cisco document 6500-sup720 and 7600-rsp720 are support IPv4 unicast and MPLS—512,000 routes by default. On my network we have route more than 400K which nearly reach to the limit then I tried to change from 512K to 1007K as below.

Router#sh mls cef maximum-routes

FIB TCAM maximum routes :

=======================

Current :-

-------

IPv4                - 1007k

MPLS                - 1k

IPv6 + IP Multicast - 8k (default)


After rebooted I got high cpu issue on both 6500-sup720 and 7600-rsp720 then I tried to tuning to other value such as 600K , 700K and so on but doesn't help.

Summary

   - I have no cpu issue with default value for mls cef maximum-route

   - I have cpu issue when tuning to other value such as 600K , 700K

Please advise.

Pichet

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