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

[Antonio Soares]

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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