>From Cisco's WEB Site and to confirm/clarify previous responses:
(http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/rel_5_2/config/
e_trunk.htm#xtocid57315)
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.
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