Posted by: manilageek | March 9, 2010

Change STP VLAN priorities and implement STP root Guard

I created the change below to correct our STP load balancing between the primary core switch and the secondary core switch. Previous implementation incorrectly set the VLAN STP priorities and we have to implement this change before we can add root STP root guard on all uplink ports going to the edge switches. This is done to project our core switches from taking over as the root of our STP domain from any one who will configure a switch connected to the edge with lower priority.

 With this implementation we can make sure that only the two core switches (primary and secondary) can only be elected as the root bridge.

—————————————————-
                    | CoreSW1001 | CoreSW1002
—————+—————-+—————–
Odd VLAN   | 8192                 | 16384
—————+—————-+—————–
Even VLAN | 16384              | 8192
—————————————————-

CoreSW1001:

conf t
spanning-tree vlan 215 priority 8192

spanning-tree vlan 202 priority 16384

CoreSW1002:

conf t
spanning-tree vlan 215 priority 16384

spanning-tree vlan 202 priority 8192

————————-
enabling STP Root Guard
————————-

CoreSW1001:

cont t
int r “all uplink interface”
spanning-tree guard root
end
wr mem

CoreSW1002:

conf t
int r “all uplink interface”
spanning-tree guard root
end
wr mem

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