%c4k_SWITCHINGENGINEMAN-4-VFEOPINTERRUPT Error and Flapping Tunnel

[K-Grev]

Hi guys,

I'm setting up a tunnel. For the most part it is successful. I can pull system webpages and a few other tasks from across the tunnel.

However I keep getting intermittent interruptions. It happens pretty much on a revolving timer about every 10 seconds and last for just a few seconds.

When it happens i get this error from the inside source of the tunnel.

%c4k_SWITCHINGENGINEMAN-4-VFEOPINTERRUPT: VFE OP rrqEngCntExceed interrupt. valid: 1 txVlanId: 0x0 fwdIndextype: 2, fwdIndex: 0xBB6D floodtocpu: 0 icCopyIndexType: 0 ocCopyindexType: 0 cpuCopy: 0 rrqRecirc: 0 rxSpan: 0x0 txspan: 0x0 doRxVlanBridging:0

Attached photo with error and debug ip routing.

Has anyone seen this error or have any advise to resolve this?

Thanks for any and all help!

[balaji.bandi]

we are not sure what is the device mode and IOS running it.

we do see some bug related to that error not sure is that effectig : ( so provide mode and ios version)

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo97687/?rfs=iqvred

[K-Grev]

Balaji,

Thanks for your response.

Far device is Cisco IR809G-LTE-NA-K9 - UniversalK9-mz.spa.158-3.M0a

Near Device is Cisco WS-C4500X-32 - UniversalK9.spa.03.08.09.E.152-4.E9

Im not sure what you mean by "mode" but will gladly get that for you if you tell me how.

[K-Grev]

Just checking back in. Problem still persists. Thanks for your time.

[K-Grev · Accepted solution]

Fixed. My issue was somehow revolved around "keepalive 10 3" on my tunnel interfaces. I don't fully understand why it would flap with this but I took it off and its working fine now.

[Giuseppe Larosa · Accepted solution]

Hello @K-Grev ,

>> revolved around "keepalive 10 3" on my tunnel interfaces. I don't fully understand why it would flap with this but I took it off and its working fine now.

if the command is seen as set keepalive interval to 10 seconds and hold time to 3 seconds it creates instability because the hold timer is lower then the keepalive interval.

Hope to help

Giuseppe

[K-Grev]

Thank you sir. I did not know that. I had a misunderstanding about that
keepalive function.