Configuration considerations

The configuration considerations are as follows:

• You can configure up to 128 topology groups. A VLAN or bridge-domain cannot controlled by more than one topology group. You can configure up to 4K VLANs or bridge-domain as members of topology group.
• The topology group must contain a master VLAN. The group can also contain individual member VLANs and or member bridge-domains. You must configure the member VLANs or member bridge-domains before adding them to the topology group. Bridge-domains cannot be configured as a master VLAN.
• You cannot delete a master VLAN from the topology group when the member VLANs or bridge-domains are in the topology group.
• The control port membership must match the master VLAN when adding a member VLAN or member bridge-domain.
• If a VLAN enabled with the PVST+ or R-PVST+ protocol is added as a member VLAN of a topology group, the protocol is disabled. The member VLAN is added to the topology group. If the VLAN is removed from the topology group, the protocol is disabled, and you must enable the protocol if required.
• Enabling STP on an interface is only allowed if both master VLAN and member VLAN or bridge-domains are configured on the interface across all topology groups.
• You cannot remove the master VLAN or member VLAN or bridge-domains from an STP enabled interface.
• Topology group configuration is allowed only with PVST+ and R-PVST+ spanning tree configurations.