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Multiple Spanning-Tree

November 3rd, 2010

An aide-memoir.  This example uses dual distribution layer switches for load-balancing VLAN traffic using MST:

On 3750 Access Switch:
spanning-tree mode mst
!
spanning-tree mst configuration
name VTP_name
revision 2
instance 1 vlan 100-199, 300-399, 500-599, 700-799, 900-999
instance 2 vlan 2-99, 200-299, 400-499, 600-699, 800-899
!
—————————-
On Distribution Layer Switch 1:
spanning-tree mst configuration
name VTP_name
revision 2
instance 1 vlan 100-199, 300-399, 500-599, 700-799, 900-999
instance 2 vlan 2-99, 200-299, 400-499, 600-699, 800-899
!
spanning-tree mst 0 priority 4096
spanning-tree mst 1 priority 28672
spanning-tree mst 2 priority 24576
—————————-
On Distribution Layer Switch 2:
spanning-tree mst configuration
name VTP_name
revision 2
instance 1 vlan 100-199, 300-399, 500-599, 700-799, 900-999
instance 2 vlan 2-99, 200-299, 400-499, 600-699, 800-899
!
spanning-tree mst 0 priority 4096
spanning-tree mst 1 priority 24576
spanning-tree mst 2 priority 28672

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