3750X showing unexpected log

[loveandrew821]

hello everyone,

one of the 3750x which is operating on our customers site is showing the log below

log : %ADJ-3-RESOLVE_REQ: Adj resolve request: Failed to resolve 11.71.101.241 Vlan300

here is the info of the unit

PID : WS-C3750X-24

VER : 15.0(2)SE8

can anyone help with this issue?

ps. I wonder waht is ' no ip cef optimize neighbor resolution' command

thank you

best regards

[InayathUlla Sharieff · Accepted solution]

Hi,

I think that you are  hitting bug CSCuo89272, and you can view
its details in the following link:

CSCuo89272 (https://tools.cisco.com/bugsearch/bug/CSCuo89272/?reffering_site=dumpcr )

The workaround suggested for it is to execute the "no ip cef optimize neighbor resolution"
command.

This command disables address resolution optimization from Cisco Express Forwarding for
directly connected neighbours and won't have any business impact. The fix for the bug is
not yet available so the only way to address the issue is to configure the workaround.

HTH

Regards

Inayath

**Please do not foget to rate this post if helpfull**

[loveandrew821]

hi thank you for your kindness

could you please give me futher more infomation about the

"address resolution optimization from cef"

(how does that work?)

I'd like to see some documents if I can...

[InayathUlla Sharieff · Accepted solution]

Hi,

Here you go:-

http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/arpoptim.html

HTH

Regards

Inayath

**Please do not foget to rate this post if helpfull and mark the thread as answered if it has resolved your query**