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06-15-2010 04:35 PM
06-15-2010 04:35 PM
MSTP with VLAN configuration Help
My plan is to configure 2 x 2900 and stacked them. Make the HP4204vl as the root switch and the stacked 2900 as the root backup and the backup router for the HP4204vl
All the 2524â s will be replaced by the 2510â s. I just need configuration help with:
â ¢Making the 4204vl in server room 1 as the root switch
â ¢Making the stacked 2900 as the backup root switch and backup inter-vlan router
â ¢Ensure that my network traffic (7 VLANâ s) always has a valid path through the redundant link during a failure of a link or switch â Will sort out the connections without redundant links later
Hope someone helps
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06-15-2010 10:16 PM
06-15-2010 10:16 PM
Re: MSTP with VLAN configuration Help
2nd thing is taht the 4200 series and the 2900 series are not supporting VRRP which is required to do the master and backup routing devices.
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06-16-2010 01:34 PM
06-16-2010 01:34 PM
Re: MSTP with VLAN configuration Help
Thanks for your help
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06-17-2010 09:58 AM
06-17-2010 09:58 AM
Re: MSTP with VLAN configuration Help
Looking at your drawing a simple "span" command will do and setting the priority.
Only the switches with the redundant paths will need spanning-tree.
In your case only CST (=RSTP) will be used.
Or for simplicity you could fore RSTP-mode.
All VLANs will take the same route.
It is a shame you don't have connections from the edge switches towards serverroom 2.
Then you could use MSTP as it should. However you would need VRRP which needs the Premium license.
I quess the connection between the 4204 and the 2900 is not redundant?
Greetz Jaap
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06-17-2010 04:10 PM
06-17-2010 04:10 PM
Re: MSTP with VLAN configuration Help
Thanks for your advice
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06-17-2010 06:51 PM
06-17-2010 06:51 PM
Re: MSTP with VLAN configuration Help
My plan is this:
Create Instance 1 with VLAN 1-7
Create Instance 2 with VLAN 1-7
Then configure 4204vl:
- Root for Instance 1
- Backup for Instance 2
- Root for the IST
And configure 2900:
- Backup for Instance 1
- Root for Instance 2
- Backup for the IST
4204vl:
--------
4204vl(config)#span priority 0
4204vl(config)#span instance 1 vlan 1-7
4204vl(config)#span instance 1 priority 0
4204vl(config)#span instance 2 vlan 1-7
4204vl(config)#span instance 2 priority 1
4204vl(config)#span ***enabling Spanning Tree**
2900:
--------
2900(config)#span priority 1
2900(config)#span instance 1 vlan 1
2900(config)#span instance 1 priority 1
2900(config)#span instance 2 vlan 2-3
2900(config)#span instance 2 priority 0
2900(config)#span ***enabling Spanning Tree**
Is this how I'm going to configure my 2 switches
What configuration will I do for the edge switches with redundant link ? same as the above ?
Need configuration help
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06-19-2010 12:42 AM
06-19-2010 12:42 AM
Re: MSTP with VLAN configuration Help
You can use RSTP. Read e.g. page 6-14 and on in the Advanced Traffic Management guide.
You will also need VRRP if you want to make a switch the backup root switch.
VRRP will allow the use of a 'shared' default gateway IP-address between two core switches. This is necessary for your pc's if one of the two core switches fails.
To be able to use VRRP you will need to buy a Premium license for both core switches.
Neither the 4204vl nor the 2900 switches supports the VRRP feature.
Greetz Jaap
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06-20-2010 04:12 PM
06-20-2010 04:12 PM
Re: MSTP with VLAN configuration Help
The manual says nothing about 4204vl RSTP on that page that. For the time being I can go without VRRP. My current concern is if one of the link breaks to one of the site, other sites (that have the redundant link) suppose to find an alternative way back. Does that still require VRRP ?
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06-22-2010 10:55 AM
06-22-2010 10:55 AM
Re: MSTP with VLAN configuration Help
Unfortunately your right. RSTP in that manual only applies to every model except the 4204 :(. Read over the chapter headings. Sorry..
MSTP requires: configuration name, configuration revision, MST instances and mapped vlans on all switches to be the same. That is not the case in your config.
You need VRRP with MSTP because - if one of the core switches fails the other will take over for the instance it is the backup for. However that switch has another IP address for the VLANs mapped for that instance. That means the configured default gateway on the pc's will be misconfigured. That will not be a problem if traffic remains within a VLAN but will be for hopping over to another VLAN.
That's where VRRP comes in. It enables the core switches to have one virtual ip-addres for each VLAN within the instance. If one of the cor switches fails the virtual ip addres is used by the other core switch.
You could also decide not to implement MSTP instances. Then MSTP will work like rstp with 'normal' spanning tree operation.
Hth Jaap
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06-22-2010 03:41 PM
06-22-2010 03:41 PM
Re: MSTP with VLAN configuration Help
My main concern here is creating another path for a site to be able to connect back to the server room if the main path fails. At the moment I have alternative fiber/UTP links setup but not connected. Wireless bridge is something I'm planning to link server room 1 and server room 2. This will come in when I first get the current infrastructure works with redundant paths. Switch failure issue can be addressed by replacing the switch itself as I got a couple of spares with me.
Any other idea or option I can use ? Hope I'm clear and thanks for your help and response