Hi, We ran into this problem when we upgraded our 3750Xs to 15.0(2)SE6. This was resolved by disabling ip cef optimize neighbor resolution No ip cef optimize neighbor resolution As reference in this forum: https://supportforums.cisco.com/discussion/12215721/3750x-stack-repeatedly-showing-error-adj-3-resolvereq-adj-resolve-request-failed The other option is to remove all arp incomplete entries by checking all the issues. According to the notes in this forum, optimized neighbor resolution is disabled by default on IOS 12 and it is enable on IOS 15. I haven't been able to confirm this but disabling it removed the problem without affecting routing.
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This snmp procedure saved me from a last minute reload and IOS change. Thank you ! I was also lucky to have a RW SNMP community on the switch so that saved me a lot of trouble. I had to do this on a production 3750X-48T-S using Kaly with atftp. Very easy once I knew what each parameter meant. I used the URL below for reference on the parameters. https://supportforums.cisco.com/document/10046/how-copy-configuration-files-and-cisco-ios-routers-use-snmp Now I am just waiting to proceed with upgrading to 15.0(2)SE6 in the hopes that this version doesn't have the TACACS problem. Has anyone heard of this version being stable ? This is the version recommended on the download site.
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