- A topology group will be configured with the VLAN configured as master VLAN, which can be verified from the following command:
- MLX#show metro-ring
- A topology group is a named set of VLANs that share a Layer 2 control protocol. Topology groups simplify configuration and enhance scalability of Layer 2 protocols by allowing you to run a single instance of a Layer 2 protocol on multiple VLANs, where this one instance of the Layer 2 protocol controls all the VLANs.
- The master VLAN contains the configuration information for the Layer 2 protocol.
- The member VLANs are additional VLANs that share ports with the master VLAN.
- The Layer 2 protocol settings for the ports in the master VLAN apply to the same ports in the member VLANs. A change to the master VLAN’s Layer 2 protocol configuration or Layer 2 topology affects all the member VLANs. Member VLANs do not independently run a Layer 2 protocol.
- When primary interface of the master VLAN flaps, protocol convergence takes place and the secondary interface will transition from 'Blocking' to 'Forwarding'.
- Since all member VLANs are in-sync with the port state of the master VLAN, all the VE interfaces of these member VLANs will flap during convergence, which is the expected behavior.