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тАО03-08-2005 05:02 AM
тАО03-08-2005 05:02 AM
MSTP between two 2800 switches
I've got two 2824 switches with each two fiber SFP's.
port 21 SW1 -> port 21 SW2 (VLAN 2) - Uplink 1
port 22 SW1 -> port 22 SW2 (VLAN 3) - Uplink 2
So what I want do to is transport VLAN 2 over Uplink 1 en VLAN 3 over Uplink 2.
When I use standard RSTP offcourse port 22 SW2 is blocked.
So I thought to use MSTP, Am I correct this is a good way?
I configured this like below, but after everything port 22 SW2 stays blocked, what am I doing wrong?
SW1(config)# span protocol-version mstp
SW1(config)# write mem
SW1(config)# reload
тАв Define an MST region identity for the switch
SW1(config)# span config-name test
SW1(config)# span config-revision 1
тАв Associate user VLANs with MST instances
SW1(config)# span instance 1 vlan 2
SW1(config)# span instance 2 vlan 3
SW1(config)# span instance 1 pri 1
SW1(config)# span instance 2 pri 2
SW2(config)# span instance 2 pri 1
SW2(config)# span instance 1 p
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тАО03-08-2005 11:52 AM
тАО03-08-2005 11:52 AM
Re: MSTP between two 2800 switches
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тАО03-08-2005 07:38 PM
тАО03-08-2005 07:38 PM
Re: MSTP between two 2800 switches
Because VLAN 3 has to be an exclusive uplink for synchronizing data between servers !!
(the servers have an extra network adapter for it)
So no other traffic can or may interfere!
Cheers,
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тАО03-09-2005 04:47 AM
тАО03-09-2005 04:47 AM
Re: MSTP between two 2800 switches
I think the reason this isn't working is because you're really creating a network bridge. Except you're trying to do some funky stuff with VLAN'ing to try to make it work.
So, I think Spanning Tree is disabling your second connection. Even though you have VLAN's to manage the traffic, switches were never meant to do that, VLANS aren't supposed to get that complex (to the point where they're limiting all traffic) I think a VLAN see's broadcasts from both networks (I could be wrong here). So if this did work, you'd criple those uplinks in a heartbeat from broadcast storms.
I'll be the first to say that networking isn't my forte, but I know a little, and I don't think this can or will work without a router segmenting the networks.
Heh, but then again, I don't even know what MSTP or RSTP are.
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тАО03-11-2005 12:59 AM
тАО03-11-2005 12:59 AM
Re: MSTP between two 2800 switches
capacity, as is sometimes necessary with STP and RSTP. This is true because, in
MST, Spanning Trees are associated with VLANs, not with physical links. The
Spanning Tree state of a link can vary according to the local topology of any MST
instance.
Allows VLANs to be assigned to different Spanning Tree instances that
independently select the lowest cost path through the bridged network
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тАО03-11-2005 03:24 AM
тАО03-11-2005 03:24 AM
Re: MSTP between two 2800 switches
Your testing will cause packet loss, but if it's set up right, it shouldn't take too long.
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тАО03-14-2005 08:22 PM
тАО03-14-2005 08:22 PM
Re: MSTP between two 2800 switches
MSTP you can see as a separate spanning tree per VLAN, so no routing involved, just a STP for each VLAN.
Nobody here played or had MSTP running ??
Cheers,
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тАО03-15-2005 01:36 AM
тАО03-15-2005 01:36 AM
Re: MSTP between two 2800 switches
Maybe you just forgot to paste it here, but I see you configuring SW1 parameters, but not all SW2 parameters. Make sure the config-name and config-revision are the same.
And also the VID -> instance assignments are the same.
I also don't see the actual enabling of spanningtree with the global command: SW1/2(config)spanning-tree
You also need to configure both ports in both switches to VLAN 2 and 3.
Another possible way you could consider is trunking the two uplinks, and use QOS to make sure VLAN 3 gets higher priority.
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тАО03-15-2005 02:45 AM
тАО03-15-2005 02:45 AM
Re: MSTP between two 2800 switches
All I want is that uplink 1 is dedicated for VLAN 2 en nothing else and uplink 2 is dedicated for VLAN 3. But off course won't interfere with eacht other on STP level.
regards,
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тАО03-15-2005 03:18 AM
тАО03-15-2005 03:18 AM
Re: MSTP between two 2800 switches
A seperate spanning-tree for each VLAN???!!! Sorry, my mind stops just before comprehending that. I wish I could help you more.