Spanning-tree MSTP

[OLAIDE911]

Hi Guys, need some assistance here. I am having issue with my CML MSTP lab, I configured mstp instance 2 assigning VLAN 51-100 to it but it's showing that there is no information available for instance. Please see images below for reference

This error goes across all switches. 

PS: I'm still new to CML

[Jens Albrecht]

With MSTP each instance must have at least one active VLAN in order to start and show up.

You assigned the VLANs 51 - 100 to instance 2 so that you need to configure at least one VLAN in this range. Assuming that your trunks do not have allowed-vlan lists configured, then creating a vlan in the range 51 - 100 will be enough to bring up your instance 2.

It does not matter whether you assign this vlan to an access port or trunk port but one VLAN per instance must be up and running which you can easily check with the "show vlan" command.

[OLAIDE911 · Accepted solution]

Well, just checked again and realized that my trunk ports were not working which i expected to work because i configured VTP. I had to reconfigure my trunk ports for it to work. It's working great now. Thank you Jens.