Procurve 2510 MSTP

[Ketan_Desai]

Hello,

I’m trying to set up a failover network, where all the switches are connected in a loop. we have 2 Vlans on the switches vlan 1 and vlan 30. im having a few issues trying to set this up i wonder if anyone can help?

on all switches ports 1-10 are on vlan 1 and ports 11-20 are on vlan 30

if I enable stp on one switch everything works and there are no issues but if i enable spanning tree on 2 or more they start blocking all the ports?

I have attached a image of what I’m trying to do i hope someone can help

Regards

Ketan

[Chrisd131313]

Hi Ketan_Desai,

To confirm you have uplink ports connecting each switch together and both VLANs are trunked on these interconnecting ports? 

I would set all the edge ports to admin "span <port_range> admin-edge-port

This will take the edge ports out of the topology so wont affect STP when it converges.

Set your "root" switch to the lowest priority "span prio 0". Normally this would be the switchthat has your router/firewall connected to.

What you can do is force STP to block on a specific port between two of your switches, to do this issue the following command on the switch that you want to block "span <port> priority <higher than 8>". This will force STP to see this port as a lower priority than the other inter switch connecting ports and block at this port.

This in itself should be enough to get the resilience in place and working. If you have any issues, strip everythig back to the most basic architecture - one connection between each switch on one port and then expand on that once it is stable.

HTH.

[Ketan_Desai]

Hello,

Thanks for your reply.

yes i have uplinks to all the switches. vlan 1 is untagged on one of the uplinks and vlan 30 is untagged on the other uplink. no has been selected on each other

port            default vlan (1)     Backup(30)

------          ------------------    --------------

1                   untaggd                  no

2                   untaggd                  no

11                no                              untagged

12                no                              untagged

i will give it a try today and get back to you

Thanks

Ketan 

[Chrisd131313]

Personally, I would trunk the four ports together and tag both VLANs on the trunks. By doing this you can use STP to block one of the inter-switch links. You could setup two MSTP regions for each VLAN if you need to have a different root bridge switch for each VLAN, but from what you are saying it would make more sense to put both VLANs over the same inter-switch links and then change one of the trunks STP priority so it blocks at that designated trunk.