I'm building out a new pre-production environment, and had planned on using Rapid-PVST on all switches, since all will be Cisco and that's what I've used in the past. However, the Load Balancers will be F5. In the event that the F5 loses a port, I would like to them run STP and switch to the blocking link rather than trigger a failover between the BigIP units.
I recently ran in to an issue where the number of VLAN instances exceeded the capacity for the line card. This environment will have about 50 VLANs trunked to 40 access switches. While I could work around the issue with filtering, just using MST might make more sense.
So what are the pros / cons of MST? I would think:
- Fewer STP instances (and lower CPU)
- Standard rather than Cisco Proprietary
- More complex to configure
- More complex to troubleshoot
Have I missed anything?