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Question about STP Priority & Cost

Hi All,

I would like to know what kind of effect could occurs when changing the following on PVST layer 2 Switches:-

1- Vlan port Priority.

2- Vlan root cost.

Appreciate any feedback,

thank you,

2 REPLIES
Silver

Re: Question about STP Priority & Cost

STP decisions are based on the following in descending order:

1. Bridge ID - this is priority + MAC

2. Root Cost - added inwards

3. Sender bridge ID -

4. Port ID - the first 6 bits of which are priority.

For all of the above, lower values are better. Root Cost is second in the decision.

Thanks.

Silver

Re: Question about STP Priority & Cost

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