Reference Guide

606 | Multiple Spanning Tree Protocol (MSTP)
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Figure 30-5. Changing the Bridge Priority
Interoperating with Non-FTOS Bridges
FTOS supports only one MSTP region. A region is a combination of three unique qualities:
• Name is a mnemonic string you assign to the region. The default region name on FTOS is null.
• Revision is a two-byte number. The default revision number on FTOS is 0.
• VLAN-to-instance mapping is the placement of a VLAN in an MSTI.
For a bridge to be in the same MSTP region as another, all three of these qualities must match exactly. The
default values for name and revision will match on all Dell Networking FTOS equipment. If you have
non-FTOS equipment that will participate in MSTP, ensure these values to match on all the equipment.
To change the region name or revision:
View the current region name and revision using the command
show spanning-tree mst configuration from
EXEC Privilege mode, as shown in Figure 30-6.
Note: Some non-FTOS equipment may implement a non-null default region name. SFTOS, for example,
uses the Bridge ID, while others may use a MAC address.
Task Command Syntax Command Mode
Change the region name.
name name
PROTOCOL MSTP
Change the region revision number.
• Range: 0 to 65535
• Default: 0
revision number
PROTOCOL MSTP
R3(conf-mstp)#msti 2 bridge-priority 0
1d2h51m: %STKUNIT0-M:CP %SPANMGR-5-STP_ROOT_CHANGE: MSTP root changed for instance 2. My
Bridge ID: 0:0001.e809.c24a Old Root: 32768:0001.e806.953e New Root: 0:0001.e809.c24a
R3(conf-mstp)#show config
!
protocol spanning-tree mstp
no disable
MSTI 1 VLAN 100
MSTI 2 VLAN 200,300
MSTI 2 bridge-priority 0