Configuration Notes and Constraints of ERPS

When configuring ERPS, pay attention to the following notes:

• Currently, the following features defined in ERPSv2 are not supported in PICOS:
  • Sub-ring
  • Configuration of revertive and non-revertive mode
  • WTB timer
• A maximum of eight ERPS rings are supported on a device, and a maximum of two instances can be configured for each ring.
• Each ERPS port must be trunk port and disable spanning tree protocol.
• The VLAN on the ERPS port is either a control VLAN or a data VLAN, and traffic from other VLANs that do not belong to either will be blocked.
• 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 mapping.
• 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.
• For scenarios of multiple physical rings with shared links, i.e., the intersected ring, in order to avoid loops, it is required that the same data VLAN cannot be configured to different physical rings.
• 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.