The master VLAN is the VLAN on the ESRP domain that exchanges ESRP PDUs and data between a pair of ESRP-enabled devices. You must configure one master VLAN for each ESRP domain, and a master VLAN can belong to only one ESRP domain.
configure esrp esrpDomain add master vlan_name
The esrpDomain parameter specifies the name of the ESRP domain, and the vlan_name parameter specifies the name of the master VLAN.