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10-25-2010 02:20 AM
10-25-2010 02:20 AM
RSTP to MST transition - config and some questions
Hi all
(I also cross-posted to the old forums at https://forums13.itrc.hp.com/service/forums/categoryhome.do?categoryId=269)
Over the weekend I transitioned from RSTP to MST in our pretty simple network, but I wonder if I have done it right.
I am using one 3500yl and 5 3400cl. The topology:
All switches are in the same region and have the same mst configuration digest.
(all switches)# spanning-tree instance 1 vlan 1 2
(all switches)# spanning-tree instance 2 vlan 3 4
In order to have some load-balancing between the two fiber trunks MST was set up like this:
sw-1 and sw-3:
# spanning-tree instance 1 trk1 path-cost 6667
# spanning-tree instance 1 priority 2
# spanning-tree instance 2 trk1 path-cost 20000
# spanning-tree instance 2 priority 4
sw-2 and sw-4:
# spanning-tree instance 1 trk1 path-cost 20000
# spanning-tree instance 1 priority 4
# spanning-tree instance 2 trk1 path-cost 6667
# spanning-tree instance 2 priority 2
No special modifications on sw-5 and sw-6.
I also would like sw-3 or sw-4 to be both regional and IST roots, so I increase their priority:
sw-3# spanning-tree priority 0
sw-4# spanning-tree priority 1
Does this look correct? The network works as expected so far, and
show spanning-tree root-history ...
indicates that the correct switches are roots.
Some questions:
- What does "spanning-tree <some-trunk> path-cost/priority nnn" do when using MST? Are these values just used for CST?
- Any suggestions on how to check that the VLAN-load-balancing actually works as expected?
Best
Maurice
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10-26-2010 08:20 AM
10-26-2010 08:20 AM
Re: RSTP to MST transition - config and some questions
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10-27-2010 02:38 AM
10-27-2010 02:38 AM
Re: RSTP to MST transition - config and some questions
hi,
To complete the reply already mention : https://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1288171369708+28353475&threadId=1453386
To verify spanning-tree vlan load-balancing, you need to verify your path (forwarding/blocking ports) to check if the tree is as expected.
"show spanning-tree instance <IST or instance-id> "
I don't remember if PCM+ offer a topology map with vlan or instance active by links. You can try it
Bye,