Connectivity 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 VLANs to different instances to achieve load balancing.
3. Ensure the same region name is configured in all the bridges running MST.
4. (Optional) Configure the revision number.
Configure MSTP
When you enable MST globally, all L2 physical, port-channel, and VLAN interfaces automatically assign to MSTI zero (0). Within
an MSTI, only one path from one bridge to another 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: ravi
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. A single MSTI provides no more benefit than RSTP. To take full
advantage of the MSTP, create multiple MSTIs and map VLANs to them.
Layer 2
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