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3-2

Multiple Instance Spanning-Tree Operation

Overview

Note MSTP cannot protect against loops when there is an unmanaged device on the

network that drops spanning tree packets, or may fail to detect loops where

this is an edge port configured with client authentication (802.1X, Web and

MAC authentication). To protect against the formation of loops in these cases,

you can use the loop protection feature (see “Loop Protection” on page 3-72).

Multiple-Instance spanning tree operation (802.1s) ensures that only one

active path exists between any two nodes in a spanning-tree instance. A

spanning-tree instance comprises a unique set of VLANs, and belongs to a

specific spanning-tree region. A region can comprise multiple spanning-tree

instances (each with a different set of VLANs), and allows one active path

among regions in a network. Applying VLAN tagging to the ports in a multiple-

instance spanning-tree network enables blocking of redundant links in one

instance while allowing forwarding over the same links for non-redundant use

by another instance.

For example, suppose you have three switches in a region configured with

VLANs grouped into two instances, as follows:

VLANs Instance 1 Instance 2

10, 11, 12 Yes No

20, 21, 22 No Yes

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