871 interface config question

Unanswered Question
May 25th, 2009

Hello


I currently have a Cisco 871 router. When I configure the WAN interface with no ip route-cache the router adds no ip route-cache cef in automatically??


Does anyone know why? Below is the output:


With ip route-cache & ip route-cache cef

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

router1#sh run int f4

Building configuration...


Current configuration : 113 bytes

!

interface FastEthernet4

ip address 95.95.95.3 255.255.255.0

no ip mroute-cache

duplex auto

speed auto

end


router1#


Then disable ip route-cache

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

router1#conf t

Enter configuration commands, one per line. End with CNTL/Z.

router1(config)#int f4

router1(config-if)#no ip rou

router1(config-if)#no ip route-cache

router1(config-if)#^Z

router1#sh run int f4

Building configuration...


Current configuration : 155 bytes

!

interface FastEthernet4

ip address 95.95.95.3 255.255.255.0

no ip route-cache cef

no ip route-cache

no ip mroute-cache

duplex auto

speed auto

end


As can be seen above the cef is included. Yet when checking my router config it shows I have cef enabled on the router.


router1#sh run | i cef

ip cef


Can someone please explain what I am missing?


Thanks

willemvw

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tomocisco Tue, 05/26/2009 - 06:41

Hi Willemvw,


From the output of your sho run above I can see you used 'no ip route-cache cef'.


If your interest is to disable ip cef, use 'no ip cef'.


How ever when you disable ip cef, 'ip verify unicast reverse-path' is also removed (if configured).


I think this feature or behavior has to do with the ios version.


Cheers.


Tom

willemvwyk Tue, 05/26/2009 - 13:06

Hi Tom


Can you please point out where I used 'no ip route-cache cef'?


To my knowledge I need to type in 'no ip route-cache cef' in order to disable it, yet I have not typed that in.


Thanks for your help :)


regards

willemvw

Paolo Bevilacqua Tue, 05/26/2009 - 11:24

Why do do want to disable ip route-cache (that is not the default anymore since years) anyway ?

willemvwyk Tue, 05/26/2009 - 12:59

Hi Paolo


Thanks for the reply. When did this stop becoming the default?


I am disabling ip route-cache purely from a configuration point of view. I am setting up 2 routers to use ezvpn and the config I am using requires no ip route-cache.


I will be posting some ezvpn questions later on the forum


Regards

willemvw

Paolo Bevilacqua Tue, 05/26/2009 - 13:18

I think CEF became default about 8 years ago.


Please post a reference about what makes you believe you need to disable route-cache for EzVPN.

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