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тАО01-06-2009 02:48 PM
тАО01-06-2009 02:48 PM
mstp about the spanning-tree priority parameter
Hi
Does the parameter spanning-tree priority has it's place in mstp configuration?
My config is like this:
Core1:
spanning-tree protocol-version MSTP
spanning-tree config-name "balance"
spanning-tree config-revision 1
spanning-tree instance 1 vlan 1 2 3
spanning-tree instance 1 priority 0
spanning-tree instance 2 vlan 4 5 6
spanning-tree instance 2 priority 1
spanning-tree
Core2:
spanning-tree protocol-version MSTP
spanning-tree config-name "balance"
spanning-tree config-revision 1
spanning-tree instance 1 vlan 1 2 3
spanning-tree instance 1 priority 1
spanning-tree instance 2 vlan 4 5 6
spanning-tree instance 2 priority 0
spanning-tree
But in the forum I have seen:
Core1:
spanning-tree priority 0
spanning-tree protocol-version MSTP
spanning-tree config-name "balance"
spanning-tree config-revision 1
spanning-tree instance 1 vlan 1 2 3
spanning-tree instance 1 priority 0
spanning-tree instance 2 vlan 4 5 6
spanning-tree instance 2 priority 1
spanning-tree
Core2:
spanning-tree priority 1
spanning-tree protocol-version MSTP
spanning-tree config-name "balance"
spanning-tree config-revision 1
spanning-tree instance 1 vlan 1 2 3
spanning-tree instance 1 priority 1
spanning-tree instance 2 vlan 4 5 6
spanning-tree instance 2 priority 0
spanning-tree
this secod config has an additional line for each switch "spanning-tree priority"
How will this line work on MSTP?
thanks
Does the parameter spanning-tree priority has it's place in mstp configuration?
My config is like this:
Core1:
spanning-tree protocol-version MSTP
spanning-tree config-name "balance"
spanning-tree config-revision 1
spanning-tree instance 1 vlan 1 2 3
spanning-tree instance 1 priority 0
spanning-tree instance 2 vlan 4 5 6
spanning-tree instance 2 priority 1
spanning-tree
Core2:
spanning-tree protocol-version MSTP
spanning-tree config-name "balance"
spanning-tree config-revision 1
spanning-tree instance 1 vlan 1 2 3
spanning-tree instance 1 priority 1
spanning-tree instance 2 vlan 4 5 6
spanning-tree instance 2 priority 0
spanning-tree
But in the forum I have seen:
Core1:
spanning-tree priority 0
spanning-tree protocol-version MSTP
spanning-tree config-name "balance"
spanning-tree config-revision 1
spanning-tree instance 1 vlan 1 2 3
spanning-tree instance 1 priority 0
spanning-tree instance 2 vlan 4 5 6
spanning-tree instance 2 priority 1
spanning-tree
Core2:
spanning-tree priority 1
spanning-tree protocol-version MSTP
spanning-tree config-name "balance"
spanning-tree config-revision 1
spanning-tree instance 1 vlan 1 2 3
spanning-tree instance 1 priority 1
spanning-tree instance 2 vlan 4 5 6
spanning-tree instance 2 priority 0
spanning-tree
this secod config has an additional line for each switch "spanning-tree priority"
How will this line work on MSTP?
thanks
3 REPLIES 3
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тАО01-07-2009 08:23 AM
тАО01-07-2009 08:23 AM
Re: mstp about the spanning-tree priority parameter
hi
Any help please?
I'am sure someone knows.
Thanks
Any help please?
I'am sure someone knows.
Thanks
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тАО01-07-2009 07:48 PM
тАО01-07-2009 07:48 PM
Re: mstp about the spanning-tree priority parameter
I believe the global priority is telling the network that Core1 and Core2 are roots for the Common Spanning Tree. In other words, these core switches would be recognized as the roots for switches running legacy STP versions.
I'm pretty sure this is done because the legacy STPs won't recognize the MST Instance info provided in the BPDUs.
If you have a test environment, this should be pretty easy to test; just put another switch into legacy opperation with and without the global priority set and observe the different behaviors. If your legacy switch has the same default priority as the core switches not configured with a global priority, the root election should be based on MAC. I would test this myself, but my equipment is currently tied up. Perhaps someone who knows for sure can post a reply.
I'm pretty sure this is done because the legacy STPs won't recognize the MST Instance info provided in the BPDUs.
If you have a test environment, this should be pretty easy to test; just put another switch into legacy opperation with and without the global priority set and observe the different behaviors. If your legacy switch has the same default priority as the core switches not configured with a global priority, the root election should be based on MAC. I would test this myself, but my equipment is currently tied up. Perhaps someone who knows for sure can post a reply.
---------------------------------------------
I work for HP, but my posts and replies are my own.
I work for HP, but my posts and replies are my own.
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тАО01-07-2009 07:52 PM
тАО01-07-2009 07:52 PM
Re: mstp about the spanning-tree priority parameter
I forgot to mention that with MSTP, dynamic VLANs always belong to the CST. So, you should see that static VLANs on the legacy switch will obey the root priority associated with the static VLANs that exist in your two MST instances.
---------------------------------------------
I work for HP, but my posts and replies are my own.
I work for HP, but my posts and replies are my own.
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
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