IP CEF Impact

[jeffbriones]

Hi guys,

I've encountered some problems when i enable ip cef on my gateway router. After enabling it, two of my linux servers went down. After disabling ip cef, everything went normal again.Any experiences on these ?

tnx

jeff

[spremkumar]

Hi

Once you enable ip cef is ur servers going unreachable ?? are you trying to check with normal ping ?

if thts the case can you chcek the route for the servers once you enable cef on ur router ..

also bit more info reqd on your network topology..

regds

[vladrac-ccna]

This could be an encapsulation issue.

Check ARP table , if you see SNAP...this is not supported by CEF.

Vlad

"Cisco bug CSCdt64100

Snap encapsulation isn?t currently supported by CEF.

"

[wochanda]

Could be that the adjacencies to the linux servers aren't coming up completely.

Heres a good doc for checking if this is the problem, and troubleshooting incomplete adjacencies:

http://www.cisco.com/en/US/tech/tk827/tk831/technologies_tech_note09186a0080094303.shtml

[jeffbriones]

Hi guys,

Heres my setup.

Linux servers --- Switch --- FW ---- 6500 --- Router

I enable IP CEF on Router then suddenly my linux servers cant be reached. I have a static route pointing to my FW if destined for my linux servers. Is this because of the static routing ? Though i have 4 more linux servers, only 2 of them fails whenever i enable ip cef.

Thanks.

jeff