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)
amsoa...@netcabo.pt
http://www.ccie18473.net
-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-boun...@puck.nether.net] On Behalf
Of Antonio Soares
Sent: sexta-feira, 11 de Abril de 2014 14:09
To: cisco-nsp@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)
amsoa...@netcabo.pt
http://www.ccie18473.net <http://www.ccie18473.net/>
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