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тАО12-03-2010 09:15 AM
тАО12-03-2010 09:15 AM
MSTP problem
Here's my config from both switches:
trunk 23-24 Trk1 Trunk
vlan10
name 10
untagged 10
tagged Trk1
vlan11
name 11
untagged 11
span-tree
span-tree Trk1 pri 4
span-tree config-name "MSTP"
span-tree config-rev 2
span-tree instance 10 vlan 10
span-tree instance 11 vlan 11
span-tree pri 0
What I'm trying to achieve is normal PVSTP configuration similar to the one under Cisco.
I need STP per VLAN and I understand that unsed HP I need to assign VLAN to MSTP instances manually, but still after doing it, I see some confusing output like this:
sh span inst 11
...
10 100/1000T 20000 128 Root Forwarding 001ffe-479740
11 100/1000T 20000 128 Alternate Blocking 001ffe-479740
12 100/1000T Auto 128 Disabled Disabled
...
Trk1 20000 128 Alternate Blocking 001ffe-479740
Why do I see Trk1 and port 10 status under instance of vlan11?? Trk1 and port10 is not a part of this VLAN and therefore instance..
Any idea?
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тАО12-03-2010 11:08 AM
тАО12-03-2010 11:08 AM
Re: MSTP problem
What you have to do is to tweak the instance priorities of the switches and ports to get a sensible set of trees, then map your VLANs onto that.
http://blog.ine.com/2010/02/22/understanding-mstp/ is a good introduction to the topic. Unfortunately MSTP and PVSTP are rather different beasts. Good luck.
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тАО12-06-2010 01:40 AM
тАО12-06-2010 01:40 AM
Re: MSTP problem
MSTP is designed to have the same STP-topology for all vlans that belong to an MST-instance.
You will understand this is contradictionary to a per-vlan topology (PVSTP).
If you want simmilar behavour, then for every vlan added to your network you need to create a separate MST instance.
Eventually you will run into a maximum of MST-instances allowed on the switch, depending on model.
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тАО12-06-2010 01:56 AM
тАО12-06-2010 01:56 AM
Re: MSTP problem
I though so and just needed to confirm it.
It's official now, HP needs to add PVSTP if they want to be successful then.
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тАО12-06-2010 02:26 AM
тАО12-06-2010 02:26 AM
Re: MSTP problem
>>> Both PVST and PVST+ protocols are Cisco proprietary protocols and they cannot be used on 3rd party switches <<
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тАО12-06-2010 02:46 AM
тАО12-06-2010 02:46 AM
Re: MSTP problem
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тАО12-06-2010 02:49 AM
тАО12-06-2010 02:49 AM
Re: MSTP problem
Juniper: http://gul-tech.livejournal.com/987.html
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тАО12-06-2010 03:02 AM
тАО12-06-2010 03:02 AM
Re: MSTP problem
MSTP an PVSTP can coexists in a network.
HP and Cisco have whitepapers on this subject.
In a homogenouos network designed with attention to STP topology, it's just a matter of choise wich one to use.
But right now your problem is just in interconnecting the devices.
Beware HP also doesn't talk VTP, so each vlan you create on Cisco must also manually be added to HP (HP talks GVRP).
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тАО12-06-2010 03:17 AM
тАО12-06-2010 03:17 AM
Re: MSTP problem
HP if you can hear me please add this functionality :) (Even if it's going to be called HP-PVSTP :)