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.
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