Users Guide

Table Of Contents
Configuring MST is a four-step process:
1. Enable MST, if the current running spanning-tree protocol (STP) version is not MST.
2. (Optional) Map the VLAN to different instances in such a way that the traffic is load balanced well and the link utilization is
efficient.
3. Ensure the same region name is configured in all the bridges running MST.
4. (Optional) Configure the revision number. The revision number is the same on all the bridges.
Configure MSTP
When you enable MST globally, all switch ports, port-channels, and VLAN interfaces get automatically assigned to MSTI zero
(0). In a MSTI, only one path is enabled for forwarding.
Enable MST in CONFIGURATION mode.
spanning-tree mode mst
Configure and verify MSTP
OS10(config)# spanning-tree mode mst
OS10(config)# do show spanning-tree
show spanning-tree mst configuration
Region Name: abc
Revision: 0
MSTI VID
0 1,7-4093
1 2
2 3
3 4
4 5
5 6
Add or remove interfaces
By default, all interfaces are enabled in L2 switchport mode, and all L2 interfaces are part of spanning-tree.
Disable spanning-tree on an interface in INTERFACE mode.
spanning-tree disable
Enable MST on an interface in INTERFACE mode.
no spanning-tree disable
Create instances
You can create multiple MSTP instances and map VLANs. To take full advantage of the MSTP, create multiple MSTIs and map
VLANs to them.
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Layer 2