Configuration Notes and Constraints of ERPS

When configuring ERPS, consider the following points:

• A maximum of eight ERPS rings (including both major ring and sub-ring) are supported on a device, and a maximum of two instances can be configured for each ring.
• The ERPS port must be a trunk port.
• Before enabling ERPS, users need to disable spanning tree protocol on specific port.
• Traffic from VLANs other than the control VLAN or data VLAN will be dropped by the ERPS ports.
• Make sure that the control VLAN and data VLANs of an ERPS ring have all been added to the MSTP instance (ERPS protected-instance) and VLAN
• When the ERPS ring instance is enabled, the traffic of MSTP instance 0 will be blocked.
• Control VLAN should be assigned as a tagged VLAN.
• Different ERPS ring instances cannot use the same control VLAN.
• The same control VLAN must be configured for all devices in the same ERPS ring instance.
• To ensure the fast convergence of ERPS, it is recommended not to configure the intersecting link as an RPL link in the configuration of the intersecting ring.
• ERPS only works with MSTP, but not STP/RSTP/PVST.
• MLAG configuration on ERPS ring ports is not supported.
• On such deployments, where gateways are serving VLANs across the ring, VRRP is recommended.