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Occasional Contributor II
Posts: 27
Registered: ‎12-18-2011

Issues with AP-103 and HA Issues

Hi All,

 

Has anybody deployed AP-103 ?

 

We are facing performance issues on it and also do we have any HA issues on 6.4.2.1 code version as the ap's randomly move over to the local controller.

 

 

 

Super Contributor I
Posts: 274
Registered: ‎04-04-2014

Re: Issues with AP-103 and HA Issues

 

Do all the APs move at the same time, or do they move one-by-one?

 

 

Occasional Contributor II
Posts: 27
Registered: ‎12-18-2011

Re: Issues with AP-103 and HA Issues

They all move at the same time and we have checked the latency part on the network seems to be no issue.
Super Contributor I
Posts: 274
Registered: ‎04-04-2014

Re: Issues with AP-103 and HA Issues

 

You may be hitting an issue I currently have in with TAC/engineering, which they tried to fix in 6.4.2.1 but the fix didn't quite do the trick in production.

 

I'll let TAC know someone else may be seeing this issue.  In the meantime, we are running with inter-controller heartbeats disabled.  This means HA is not as fast, but the AP-based HA is still working (they still build preemptive tunnels) -- we have found that the APs themselves only fail over when there is a real problem, but the inter-controller heartbeat is tripping for some reason.

 

To turn of heartbeats go to the redundancy menu, and in the groups containing the affected controllers uncheck the "heartbeat" checkbox and apply and save configuration.  Or from the CLI go into the "ha group-profile" and execute "no heartbeat" then do a "wr mem".

 

I'd be interested to know what gear you have between your controllers.

 

Occasional Contributor II
Posts: 27
Registered: ‎12-18-2011

Re: Issues with AP-103 and HA Issues

Good to know..we have temporarily disabled  HA and we have enabled LMS and BLMS redundancy which is traditional way of failing over the AP's.

 

We have two controllers connected over the MPLS link and they are connected to the Core network on a Port channel.

 

We have checked the latency and there is no latency whatsoever and also the ports have no error frames.

 

 

Super Contributor I
Posts: 274
Registered: ‎04-04-2014

Re: Issues with AP-103 and HA Issues

 

OK let's do a bit of verification that you have the same issue.

 

Please go to each controller and check "show ha hearbeat counters" and see if any were missed

while you had the feature turned on.  The stats should still be there as long as you have not reloaded.

 

On one of the APs, do a "show ap debug system-status ap-name XXX | begin "HA Failover Information"

 

See if you have a line like this there matching the same time as the APs moved:

2014-09-24 15:10:03 Failover request from standby: fail-over to 10.5.5.81

Do you have entries in the syslog from about that that time like this and also at other

times?

 

sbHeartbeat: PAPI RxPacketFromSibyte: ACK to invalid packet SN = 0x0000a36e opcode=0x6

 

We also have to rule out that you had actual packet loss.  I know you check the latency, but

did you also check for queueing drops?

 

Occasional Contributor II
Posts: 27
Registered: ‎12-18-2011

Re: Issues with AP-103 and HA Issues

Unfortunately i am not able to see the hear-beat counters between the controllers

 

 

 

HA Failover Information
-----------------------
Date       Time     Reason (Latest 10)
--------------------------------------
2014-09-25 16:45:13 Failover request from standby: fail-over to 10.224.32.30
2014-09-25 16:50:16 Pre-emptive failover back to LMS 10.223.32.30
2014-09-25 17:26:16 Failover request from standby: fail-over to 10.224.32.30
2014-09-25 17:31:20 Pre-emptive failover back to LMS 10.223.32.30

 

Please find the logs taken from one of the AP's

Super Contributor I
Posts: 274
Registered: ‎04-04-2014

Re: Issues with AP-103 and HA Issues

 

OK, if at some point in the future you turn HA back on to test, it might be best

if you disabled the "preemption" checkbox so you don't get two failovers for

every actual failover.  This will result in the APs remaining on the standby

unless/until there is another event.

 

 

Occasional Contributor II
Posts: 27
Registered: ‎12-18-2011

Re: Issues with AP-103 and HA Issues

Is it the Same bug which you are facing ?

 

Also are you using AP-103 on your network ?

Super Contributor I
Posts: 274
Registered: ‎04-04-2014

Re: Issues with AP-103 and HA Issues

 

It is hard to tell for sure because it could also be caused by real packet loss, but I don't see anything that would rule it out so far based on what I've seen.

 

We have a lot of 103H's.  The HA bug is not model-specific, it affects all models.

 

 

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