Step 1. Check the current STP mode.
|
N7k (config-if-range)# show spanning-tree vlan 30
VLAN0030
Spanning tree enabled
protocol rstp
---------<<<<<<<<<<<<<
Root ID Priority 32798
Address 0005.73bc.067c
This bridge is the
root
Hello Time 2
sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority
32798 (priority 32768
sys-id-ext 30)
Address 0005.73bc.067c
Hello Time 2
sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts
Cost Prio.Nbr Type
---------------- ---- --- --------- --------
-------------------------------
-
Eth1/1 Desg FWD
2 128.129
P2p
Eth1/2 Desg FWD
2 128.130 P2p
|
Step 2 . Enable MST
mode. By default RSTP-PVST+ is enabled.
|
N7k (config)#
spanning-tree mode mst
|
Step 3. Enter in MST
configuration mode
|
N7k (config)# spanning-tree mst configuration
|
Step 4. Give the name
to MST process. It should be same on all the switches otherwise switch will not
recognize each other.
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N7k(config-mst)# name MST1
|
Step 4. Give the revision number. Similar to the name, it
must be same on all switches in L2 domain.
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N7k (config-mst)# revision 1
|
Step 5. Create instance as per your requirement and map the
vlan to it. Make sure you don’t create unnecessary large number of instance.
|
N7k (config-mst)# instance 1 vlan 30,40
|
Step 6. This is an optional step to configure the MST root.
We can elect different switch as root for different MST instance.
|
N7k (config)# spanning-tree mst 1 root primary
N7k # show spanning-tree mst 1
##### MST2 vlans
mapped: 50,60
Bridge address
001b.54c2.67c2 priority 24578 (24576 sysid 2)
Root this switch for MST1
----------------<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Interface Role Sts
Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Eth1/1 Desg FWD
2000 128.129 P2p
Eth1/2 Desg FWD
2000 128.130 P2p
|
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