13.2.4 Selecting master and backup

<Structure of this section>

(1) Selection criteria

GSRP switches periodically send and receive GSRP Advertise frames. The master and backup GSRP switches are determined for each VLAN group based on the selection conditions information for each VLAN group contained in the GSRP Advertise frames. The following table describes the conditions supported by GSRP for selecting the master and backup switches.

Table 13-3 GSRP Supported Master/Backup Selection Criteria
Item	Description
Number of active ports	The number of enabled physical ports among the physical ports assigned to all the VLANs (except for the VLANs specified by using the state suspend configuration command) participating in the VLAN groups on a switch. The switch with more active ports becomes the master. If link aggregation is configured, a channel group is counted as a port.
Priority	Priority level set for a VLAN group in the configuration. The switch that has higher priority becomes the master.
Switch MAC address	MAC address of a switch. The switch that has the larger MAC address value becomes the master.

(2) Selection priority

[(1) The priority order of selection criteria shown in Selection Criteria can be specified by configuration. The available priority sets are the following:

Number of active ports -> priority -> switch MAC address (default)
Priority -> number of active ports -> switch MAC address