Question about the spanning-tree priority statement

Answered Question
Oct 20th, 2009

I have the following statements in my config:

spanning-tree vlan 1,20,27-28,30,32-64 priority 28672

spanning-tree vlan 72-88,90,92,96-101,104,106,160-163,200,202 priority 24576

spanning-tree vlan 204,206,250-251,254-255,264,800,980,999,1030 priority 24576

These were put in from when the switch was originally installed a few months ago. Now I want to add a vlan with a priority of 24576.

Will it just append itself to one of the existing lines or will it create a new statement? Spanning tree is a bit of an issue here and I don't want to make any changes that might cause a massive reconvergence of the network.

I have this problem too.
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Correct Answer by Jon Marshall about 7 years 1 month ago

Roland

Doesn't really matter whether it adds it to existing line or creates new one. What does matter is if you change the priority of a switch for that vlan STP will need to recalculate for that vlan and only that vlan. So this sort of thing is best done out of core production hours.

Jon

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Correct Answer
Jon Marshall Tue, 10/20/2009 - 16:52

Roland

Doesn't really matter whether it adds it to existing line or creates new one. What does matter is if you change the priority of a switch for that vlan STP will need to recalculate for that vlan and only that vlan. So this sort of thing is best done out of core production hours.

Jon

rshum Tue, 10/20/2009 - 16:55

Thanks for the help gave me the answer I was looking for.

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