Hello Chuck, As usual the answer is "it depends". If you were only going to deal with a known set of vendor equipment such as Cisco and Juniper then you are ok to do either. In production I have run into issues with certain vendors such as HP Procurve and IBM/BNT switches that only allowed you to assign defined VLANs to instances.
Eg BNT switches only supported 2000 vlans on a switch and only those vlans could be assigned to instances you would end up with MST inconsistencies leading to them wing treated as a separate region. The only work around I found was that BNT would still assign undefined vlans to MST0. Also remember motto neglect MST0 priorities as it is still utilized for inter-region calculations and for backwards compatibility. Hope this helps, Kurt / @networkjanitor On Wednesday, October 17, 2012, chuck mcfadden wrote: > I have set up a lab to test migratation from PVST to MST. The lab will use > VLAN 1-1005; private VLANs are not used. For the first test phase, all > active VLANs will be placed in Instance 1 (no load balancing). > > I have read some conflicting information on best practice for configuring > MST and I'm hoping someone can offer their opinion: > > One method says to configure "as few VLANs as possible" in Instance 0 and > as many as requird in the remaining Instances. For Example: > > spanning-tree mode mst > spanning-tree configuration > name Cisco > version 10 > instance 1 vlan 1-4094 > spanning-tree mst 0-1 priority 24576 > (MST0 - no vlan; MST1 - vlan 1-4094) > > > The other method says to put only the used VLANs in Instance 1-64, leaving > the non-used VLANs in Instance 0. For Example: > > spanning-tree mode mst > spanning-tree configuration > name Cisco > version 10 > instance 1 vlan 1-1005 > spanning-tree mst 0-1 priority 24576 > (MST0 - 1006-4094; MST1 - vlan 1-1005) > > > Which configuration would be "more correct"? Does anyone have a good link > where I can get more information? > > Thanks, > Chuck > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
