User Manual

Chapter 20: Spanning Tree, Rapid Spanning Tree, and Multiple Spanning Tree Protocols
286 Section IV: Spanning Tree Protocols
Bridge Max Hops
MSTP regions use this parameter to discard BPDUs. The Max Hop
counter in a BPDU is decremented every time the BPDU crosses an
MSTP region boundary. Once the counter reaches zero, the BPDU is
deleted.
Revision Level
The revision level of an MSTP region. This is an arbitrary number that
you assign to a region. The revision level must be the same on all
bridges in a region. Different regions can have the same revision level
without conflict. The range is 0 (zero) to 255.
CIST Priority
The priority number for the bridge. This number is used in determining
the root bridge of the bridged network. This number is analogous to
the RSTP bridge priority value. The bridge in the network with the
lowest priority number is selected as the root bridge. If two or more
bridges have the same bridge or CIST priority values, the bridge with
the numerically lowest MAC address becomes the root bridge.
6. Once you have adjusted the parameters, click the Apply button.
7. To permanently save the changes, select the Save Config menu
selection.
Associating
VLANs to MSTIs
This section explains how to create and delete MSTI IDs and how to
associate VLANs to MSTI IDs.
To manage the MSTI ID and VLAN associations, perform the following
procedure:
1. Display the Spanning Tree Expanded Web Page for MSTP by
performing Steps 1 through 4 in the procedure “Configuring MSTP and
CIST Parameters” on page 283.
2. To create or delete an MSTI ID and to associate VLANs to MSTIs, do
the following:
a. In the CIST/MSTI Table section of the menu, click Add.