Hi
For the beging I am trying to work with just one VLAN.
The CISCO documentation says that other equipments are working with
just one instance of STP for all VLANS defined inside of them.
See the link
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/rel_5_2/config/e
_trunk.htm#30643
Here you have an excerpt
IEEE 802.1Q Trunk Restrictions
IEEE 802.1Q trunks impose some limitations on the trunking strategy for a
network. The following restrictions apply when using 802.1Q trunks:
In a network of Cisco switches connected through 802.1Q trunks, the
switches maintain one instance of spanning tree for each VLAN allowed on the
trunks.
Non-Cisco 802.1Q switches maintain only one instance of spanning tree
for all VLANs allowed on the trunks.
When you connect a Cisco switch to a non-Cisco device through an 802.1Q
trunk, the Cisco switch combines the spanning tree instance of the native
VLAN
of the trunk with the spanning tree instance of the non-Cisco 802.1Q
switch. However, all per-VLAN spanning tree information is maintained by
Cisco
switches separated by a cloud of non-Cisco 802.1Q switches. The
non-Cisco 802.1Q cloud separating the Cisco switches is treated as a single
trunk link
between the switches.
Make sure the native VLAN for an 802.1Q trunk is the same on both ends
of the trunk link. If the native VLAN on one end of the trunk is different
from the
native VLAN on the other end, spanning-tree loops might result.
Disabling spanning tree on the native VLAN of an IEEE 802.1Q trunk
without disabling spanning tree on every VLAN in the network can potentially
cause
spanning-tree loops. We recommend that you leave spanning tree enabled
on the native VLAN of an 802.1Q trunk, or disable spanning tree on every
VLAN
in the network. Make sure your network is loop-free before disabling
spanning tree.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: 13 noiembrie 2000 19:32
To: 'Piatnitchi Cristian'
Subject: RE: Cat5000, BayStack350 and 802.1q trunking
Are you sure you can configurate one STP instance per VLAN working with the
BayStack?
Once I had a problem with a Cisco equipment and a Nortel equipment, both
with dot1q, several VLAN?s defined and working with STP. The problem was
that the ports working in blocking state had no "logic". At last I saw that
the Nortel could work only with one root bridge, not one per VLAN.
I am not saying this is your problem, but I think you should check it.
I hope this helps.
Juanjo Romero.
Transport & Access Networks Eng.
CCNA, CCDA
_________________________________
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
