We recommend keeping the default settings unless you have considerable knowledge and experience with ESRP.
When an ESRP-aware switch receives an ESRP PDU on a domain, the software looks up the group to which the PDU belongs. If the group is found, the ESRP-aware switch processes the PDU then and forwards it according to the group‘s specified aware selective forwarding port list. If no selective forwarding port list is configured, the switch forwards the PDU from all of the ports of the domain‘s master VLAN. If the group is not found, the PDU is forwarded on all ports.
When a user adds one or more ports to the ESRP-aware port list (for example, 5:1 and 6:2) that are not part of the master VLAN, the following message appears:Warning: Port 5:1, 6:2 not currently a member of master vlan
The ports will still be added to the ESRP-aware port list; however, PDUs will not be forwarded out of those ports until they are added to the master VLAN.