ADJ-5-RESOLVE_REQ_FAIL: Suddenly when one laptop was turned off.

[K-Grev]

Hi,

I have a switch with many of the same laptop plugged into it. These laptops are turned on and off daily but yesterday when a certain laptop went down the switch started flooding these log messages:

ADJ-5-RESOLVE_REQ_FAIL: Adj resolve request failed for X.X.X.X on VlanXXXX

I started by shutting the port and clearing arp cache but no change.

The switch is a WS-C3750X-48P    IOS: c3750e-universalk9-mz.152.4.E8.bin

[K-Grev · Accepted solution]

Sorry, a well known fix has been documented that I somehow missed.

https://community.cisco.com/t5/switching/adj-resolve-request-failed-to-resolve/td-p/2822307

"no ip cef optimize neighbor resolution"

[Reza Sharifi]

Hi,

Maybe a bug in the IOS you are running. There is a bug id associated with the error message but this is for a different platform. An upgrade may be needed.

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCuo89272/?rfs=iqvred

HTH

[BrianSekleckiGE]

All:

There must be 100+ posts in the Cisco community about this error message, and the known-work-around.  

However, what Is missing from those messages:  Does the work-around impact performance?

Does anyone have any official communication from Cisco (or AB-Rockwell?)

In the mean time, I propose a second/alternative solution to simply filter out those messages from the log with a "discriminator" config, while leaving CEF optimization fully enabled:

!
!
no logging buffered
no logging console
!
no logging discriminator Filter_CEF_ErroneousWarning
logging discriminator Filter_CEF_ErroneousWarning facility drops ADJ severity drops 5 mnemonics drops RESOLVE_REQ_FAIL msg-body drops Adj
!
logging buffered discriminator Filter_CEF_ErroneousWarning 32786 informational
logging console discriminator Filter_CEF_ErroneousWarning debug
!
!