30.2.6 Notes on running the Ring Protocol and GSRP together

(1) About configuring virtual-link VLAN

When the Ring Protocol and GSRP are used together, a virtual link VLAN needs to be set to send flush control frames. This virtual link VLAN must belong to the VLAN for data transfer group for the Ring Protocol.

The figure below shows virtual link ID settings. The same virtual link ID needs to be set for the same GSRP group device. Also, a unique value needs to be set within the ring network in which the same virtual link VLAN is set. When virtual link ID 50 is set for Switches A, C, D, and F, which do not have the same GSRP group, MAC address tables can no longer be cleared by flush control frames for the corresponding devices.

(2) About Changing Ring Protocol's VLAN Mapping or GSRP Grouping

When the Ring Protocol and GSRP are used together, all VLANs for Ring Protocol VLAN mappings and VLANs for GSRP VLAN groups need to match. If they no longer match due to a configuration change, VLANs affected by the changes might switch to Blocking status, preventing transmission for some VLANs.

Therefore, when the configuration is changed to use Ring Protocol and GSRP together, the priority, backup-lock, or other command needs to be set on the GSRP backup device to prevent switching to the master before the change is made.

(3) VLAN that can be set per 1VLAN group/group

When 511 or more VLANs are made to belong to a VLAN group used with the Ring Protocol, ring ports might temporarily change to Blocking status when the corresponding VLAN group changes status.

Make sure that no more than 510 VLANs are made to belong to a VLAN group used with the Ring Protocol.

(4) About GSRP VLAN group-only control function

When the Ring Protocol and GSRP are used together, the ports for VLANs not belonging to a VLAN group might be changed to Blocking status for the following situations, even if the GSRP VLAN group-only control functionality is set.

- The Ring Protocol is not running due, for example, to an incorrect Ring Protocol configuration

The VLAN set for the control VLAN of the ring ID for which the Ring Protocol functionality is not running properly might be in the Blocking status. Note that the ring port is not in Blocking status.

- Ring Protocol functionality has been disabled by the disable command

The VLAN set for the control VLAN of the ring ID for which the Ring Protocol functionality has been disabled might be in the Blocking status. Note that the ring port is not in Blocking status.

. [30.2.2 Ring Protocol and GSRP combination conditions in "Combination conditions" are not satisfied.

VLANs for which the conditions for using the Ring Protocol and GSRP together are not met might be in the Blocking status.

(5) Applying the Layer 3 redundancy switching functionality

When the Ring Protocol and GSRP are used together for the same data VLAN, the Layer 3 redundancy switching functionality cannot be applied. When connecting a GSRP network and ring network by applying such functionality, set each different data VLAN for the Ring Protocol and GSRP, and run them separately.