I have a network LAN core of two WS-C5500 switches running CATOS cat5000-sup3.5-5-3.bin. Cascaded off these are multiple 2950s (each with several hubs connected) dual uplinked, one to each 5500.
When attaching a new 2950 to either 5500 I am seeing the following in the logs and the network grind to a halt for around 60 secs (9pings lost each time):
2007 Apr 13 12:22:54 %MLS-4-RESUMESC:Resume MLS after detecting too many moves
2007 Apr 13 12:23:17 %MLS-4-MOVEOVERFLOW:Too many moves, stop MLS for 5 sec(4000
This happens even if I only attach a single uplink from a new 2950 (ie: do not create a loop in the network) to one of the 5500s.
Also the MAC address that seems to be causing this (when performing mls notification and sh looktable cmds) changes frequently, indicating that its more than one MAC causing the problem.
Spanning-tree is switched off for all VLANs:
set spantree disable all
Has anyone one else seen similar problems or can advise on why this may be ocurring?