Spanning tree between C4506 & Nortel bay stack 425
We have 2 core switches 4506 & 4510R, access switches are nortel bay stack 425. Now we are going to connect all Nortel switches to 2 core switches thru 2 uplinks. We have multiple vlans and load balancing between the 2 Cores.
Kinldy suggest me the best spanning tree protocol which will support these two vendors.
Re: Spanning tree between C4506 & Nortel bay stack 425
I agree with Giuseppe, it's best to run MST in that case. If you run any pvst flavor (just forget about the + in pvst+, all our switches are pvst+ nowadays), the cisco devices will not see the third party switch. You will be able to do load balancing but:
- except for vlan 1, all the blocked port will be on the 4500
- convergence will be slow in case of failure.
- you could even have short transient loops when links come up.
If you run MST on the 4500s, the blocked port will be on the access switch. You will never have transient loop.
If the third party bridge is capable of running RSTP, you will have fast convergence.
If the third party bridge is capable of running MST in the same region as the 4500, you will be able to achieve fast convergence and load balancing on the uplinks.
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