Posted by: manilageek | March 2, 2010

STP VLAN root primary|secondary

I just was testing this on live network. We are trying to find out how this Cisco Macro command will be able to set the STP priority. We expect that we get a priority of 8192 for the primary root bridge and 16384 for the secondary root bridge, but after we created a new VLAN and implemented the commands on our primary core switch as the primary root and secondary core as the secondary root and we get the following setting below:

Core1:

Core1#sh run | i span

Spanning-tree vlan 999 priority 24576

Core2:

Core2#sh run | i span

Spanning-tree vlan 999 priority 28372

We really don’t know why this priority setting is deferent from the previous VLAN STP implementations done on the same core switches.

I’ll be posting the answers if I can find out the explanation behind this.

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