[c-nsp] Strange Issue with 3560X and 4500X

[Dan Brisson]

Ah, didn't think I had it or I would have included it in the first 
email, but turns out I do have it:

Csuj73571

Hope that helps!

-dan


Dan Brisson
Network Engineer
University of Vermont
(Ph) 802.656.8111
dbrisson at uvm.edu

On 4/12/14, 8:22 AM, Antonio Soares wrote:
> Great, thanks for the feedback. Are you able to tell me the bug id ?
>
>
> Regards,
>
> Antonio Soares, CCIE #18473 (RS/SP)
> amsoares at netcabo.pt
> http://www.ccie18473.net
>
>
>
> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Dan
> Brisson
> Sent: sábado, 12 de Abril de 2014 13:15
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Strange Issue with 3560X and 4500X
>
> We had a problem about 6 months ago when we installed our first pair of
> 4500Xs where they could reach certain hosts but not reach other hosts on the
> same subnet. TAC said it was a bug that has since been fixed. We are on this
> version now and the problem has been resolved:
> cat4500e-universalk9.SPA.03.05.01.E.152-1.E1.bin
>
> -dan
>
>
> Dan Brisson
> Network Engineer
> University of Vermont
> dbrisson at uvm.edu
>
> On 4/12/14, 7:03 AM, Antonio Soares wrote:
>> Group,
>>
>> We found that all the 3560-Xs connected to the secondary 4500-X
>> stopped responding to SNMP queries at the same exact minute which
>> leads to the common denominator being the 4500-X.
>>
>> Anyone has experienced strange things with 4500-Xs running 3.5.0E /
>> 15.2(1)E ?
>>
>>
>> Thanks.
>>
>> Regards,
>>
>> Antonio Soares, CCIE #18473 (RS/SP)
>> amsoares at netcabo.pt
>> http://www.ccie18473.net
>>
>>
>> -----Original Message-----
>> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf
>> Of Antonio Soares
>> Sent: sexta-feira, 11 de Abril de 2014 14:09
>> To: cisco-nsp at puck.nether.net
>> Subject: [c-nsp] Strange Issue with 3560X and 4500X
>>
>> Group,
>>
>>    
>>
>> This is one of the most weird things I saw these last years. Imagine a
>> network where you have two 4500-X in the Core (no VSS) and a few
>> 3560-X pairs forming squares between the 4500-Xs and the 3560-Xs.
>>
>>    
>>
>> One of the 4500-X is the STP root for all Vlans, the other 4500-X is
>> the backup STP root for all Vlans as well.
>>
>>    
>>
>> Between the 4500-Xs and the 3560-Xs I have LACP, CDP and UDLD  running.
>>
>>    
>>
>> The issue:
>>
>>    
>>
>> The network was up and running well the first 4 days after installation.
>>
>>    
>>
>> More or less on the fifth day, all the 3560-Xs connected to the
>> secondary 4500-X, stopped responding to ping requests from anywhere in
>> the network, even from the directly attached neighbors, the two
>> 4500-Xs and the other 3560-X. A reboot to the 3560-X didn’t  solve the
>> problem. UDLD, CDP and LACP didn’t fail at all.
>>
>>    
>>
>> In order to get normal access to the 3560-X, I had to shutdown the
>> uplink from the 3560-X to the 4500-X.
>>
>>    
>>
>> I have a simple diagram here:
>>
>>    
>>
>> http://ccie18473.net/issue-sw2.jpg
>>
>>    
>>
>> What seems to happen is that broadcasts (ARP, DHCP) and multicast
>> start to fail somewhere in time.
>>
>>    
>>
>> It must be a very severe 4500X or 3560X bug  but I wasn’t able to find
>> anything. The most important information:
>>
>>    
>>
>> WS-C4500X-32, cat4500e-universalk9.SPA.03.05.00.E.152-1.E.bin
>>
>>    
>>
>> WS-C3560X-48P, c3560e-universalk9-mz.150-2.SE.bin, the uplink is fiber
>> optic, the C3KX-NM-10G is used, between the 3560Xs I have copper
>>
>>    
>>
>> Unfortunately I can’t reload/upgrade the 4500X-s or the 3560X-s…
>>
>>    
>>
>> Any pointers are more than welcome.
>>
>>    
>>
>>    
>>
>>    
>>
>> Thanks.
>>
>>    
>>
>> Regards,
>>
>>    
>>
>> Antonio Soares, CCIE #18473 (RS/SP)
>> amsoares at netcabo.pt
>>
>> http://www.ccie18473.net <http://www.ccie18473.net/>
>>
>>    
>>
>>    
>>
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>>
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