Mekari / Cisco - MSTP and RSTP Configuration Questions
I have been task with configuring STP for one of our customers and looking for some direction on how to configure the environment. The topology consist of Cisco 4506 devices on the end and Meraki MS425-32 and MS120-24 in the middle. I will be implementing MSTP and from the information I found doing my research, Meraki doesn't support
MST but is compatible and will see the traffic as one instance. From the information I have found to make the Meraki devices the root? Once the traffic passes through the Meraki devices the 4506 will re-elect a root bridge for the instance. So, if someone can inform on how to approach the configuration it will be greatly appreciated. My thoughts are below. Also, are there firmware concerns?
Re: Mekari / Cisco - MSTP and RSTP Configuration Questions
On the Cisco side it's always best practice to not only enable MST but also to put all Catalyst switches in the same region (by matching name, rev number and Instance to VLAN mapping).
Then you will have a clear boundary between the Meraki switches and the Catalyst switches.
Normally it is NOT best practice to use IST ( = MST 0) for VLAN mapping but with interconnecting to Meraki which only supports RSTP in case of classic MS switches you shouldn't have any potential PVST simulation error crap 😉
Be sure to allow VLAN 1 ( I know, strange) over the trunks so the interaction between MST and RSTP goes smoothly.