I would like your suggestions to help me Migrating PVST to RSTP. We have 2 core switches (6509 - SUP 720) connected to each other via 2 TenGig links as port-channel. Rest all the Distribution Switches (L2) (4948) are connected to Core switches via 3gbps fiber port-channel and Access switches (L2) (4948) are connected to distribution switches via 2gbps fiber port-channel.
Primary core switch is currently the root bridge and secondary is secondary root bridge. Portfast and bpdufilter is enabled on all the access ports. Total we have around 45 (4948) switches.
We know that RSTP is better in converging but i just need your expert comments since its a Live environment.
My plan while implementation was, running the default PVST in switches and later on changing it to Rapid PVST. Now what problem i faced is, There are some HP blade chassis in the Datacenter. And in these chassis, Nortal switches are embedded. Since PVST is cisco proprietary Nortal is not understanding the BPDUs.
So then, RSTP is the only option I'm seeing. But like in PVST we can do load balancing is there any way we can do the same in RSTP? If i run RSTP, there will be only one instance of STP. A single change in the Network will impact the whole traffic of Datacenter. All the Vlans will get affected.
If we talk about RSTP, is it a good idea to migrate from PVST to RSTP if the topology is really big. Why i m saying is because the datacenter is expanding. More switches we have to install. So only one instance of STP means a small change will affect the whole LAN.
MSTP is a good option but like Giuseppe said MST requires a change of mind and approach. Since the downtime will be very limited it will be a little tough to make things work fine. Lets see...
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