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Author Topic: Strange SLPP/Loop behaviour on 550 stack  (Read 2850 times)

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Offline faigy90

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Strange SLPP/Loop behaviour on 550 stack
« on: November 13, 2013, 06:44:53 AM »
Hi,  i have experience a very odd issue with 5500 stacks a few times now and I am wondering if anyone else has seen it before:

5500 stack randomly loses a leg of its SMLT back to the core or drops off the network completely.  When I check the logs of the 8600's which it connects to I can SLPP messages saying it has seen a loop on a particular VLAN from the 5500 stack.  What is wierd is that the VLANs it see's the loop on, on one occasion didnt even exist on the 5500 stack and on the other two occasions the VLAN did exist but didnt have any access ports assigned - only the MLT ports.  Sounds buggy to me, we are running code 6.1.5 on the 5500's.


Offline TankII

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Re: Strange SLPP/Loop behaviour on 550 stack
« Reply #1 on: November 13, 2013, 11:22:40 AM »
I've been having this issue as someone connects a switch to the 5XXX's that has different VLAN ID's.  The 8600's are reporting SLPP errors.
The issue came down to the switch being connected up was supposed to be access VLAN 861 on the connecting port, but was configured for trunking and had 508 and 861 on it.
If we had the port on the 5XXX connecting to that switch configured to drop tagged frames, this would not have happened.

CPU5 [10/31/13 15:16:17] SW WARNING slppRx: SLPP packet was received on Port 1/4 with SRC-MAC 00:78:4c:bf:da:01 and qualified as ingressing on VLAN 861 which differs from the actual originating VLAN 508. Terminating further processing.

Offline Michael McNamara

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Re: Strange SLPP/Loop behaviour on 550 stack
« Reply #2 on: November 13, 2013, 09:35:49 PM »
What code are you running on the ERS 8600s? That's the side that would be buggy because that's the side running SLPP no?

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Offline Dominik

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Re: Strange SLPP/Loop behaviour on 550 stack
« Reply #3 on: November 14, 2013, 03:38:52 PM »
Wich thresholds do you have configured for SLPP ?
It was already dsicussed here in the forum, that sometimes SLPP is shutting a port down, in fact over the time it has received some SLPP packets. The problem was that the counters increments for every SLPP packet that they receive
and do not recet that counter. Avaya has fixed it in the ERS8k 7.1 release.
My workaround was to use bigger numbers at the SLPP receive thresholds like 100 and 300.
Itīs always the networks fault!

Offline faigy90

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Re: Strange SLPP/Loop behaviour on 550 stack
« Reply #4 on: December 06, 2013, 08:45:21 AM »
The code on the 8600's is

Yes the 8600's run the SLPP how ever we have found this 55xx bug which looks like what we have seen:

wi00488200: SLPP packets loop over 55xx MLT ports