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) [email protected] http://www.ccie18473.net -----Original Message----- From: cisco-nsp [mailto:[email protected]] On Behalf Of Antonio Soares Sent: sexta-feira, 11 de Abril de 2014 14:09 To: [email protected] 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 didnt solve the problem. UDLD, CDP and LACP didnt 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 wasnt 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 cant reload/upgrade the 4500X-s or the 3560X-s Any pointers are more than welcome. Thanks. Regards, Antonio Soares, CCIE #18473 (RS/SP) [email protected] http://www.ccie18473.net <http://www.ccie18473.net/> _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
