TCNs can also be sent by regular ports; servers/workstations/printers. One thing to be aware of is native VLAN tagging for 802.1q on your trunks. Is the Catalyst tagging it, or not?
What are your "core" switches? As stated, set the priority of the core to something lower than the others. Are you using MISTP, or PVST on the Catalysts? -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Wright, Jeremy Sent: Friday, April 19, 2002 10:22 AM To: [EMAIL PROTECTED] Subject: RE: Spanning Tree in a Cisco / Cabltron (Enterasys [7:41946] i have seen this before with a similar environment but the device that was causing this was an old bay box that was generating TCN BPDU's causing respans. you might want to fire up a sniffer and filter on BPDU. as far as the root switch, i would nail down the priority on all of the switches. be aware of what the default priorities are on both the cisco and enterasys devices. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Friday, April 19, 2002 8:23 AM To: [EMAIL PROTECTED] Subject: Spanning Tree in a Cisco / Cabltron (Enterasys) environment [7:41944] We have a mixed environment of Enterasys E7, Cabletron 6000, Cabletron MMACs and a Cisco 2948. They are all running IEEE spanning tree. The Switches report that the Spanning tree topology keeps changing. Example, according to the Cisco 2948 its changed 9 times in under 24 hours (since I've put it in). I'm not sure what could be causing this or if this even something to be concerned about. Another thing that's got me is that I can't find the MAC address of the spanning tree root switch. I've looked at all the switched, but cannot seem to find it. Any Help appreciated. Thanks, Rob Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=41969&t=41946 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
