L04. Can Link Monitor Of Device Ha Be Used In Backup Vrrp Interfaces; Are Activated At The Same Time - ZyXEL Communications ZYWALL 1050 Support Notes

ZyWALL 1050/ZyWALL USG 300 Support Notes

L04. Can Link Monitor of Device HA be used in backup VRRP interfaces?

No, the Link monitor is designed only for master device, if the master VRRP interface's link is
down, "Link Monitor" shuts down all of the master's VRRP interfaces except the failure
interface so the backup ZyWALL takes over completely.
L05. Why do both the VRRP interfaces of master ZW 1050 and backup ZW 1050

are activated at the same time?

Since the ZW1050 master sends multicast VRRP announcement to backup ZW1050
periodically, if the backup ZW1050 doesn't receive the VRRP announcement, it will activate
its VRRP interfaces.
For the application scenario if the VRRP interface of master and backup ZW1050 connect to a
switch, the switch MUST forward the VRRP multicast to the backup ZW1050. Otherwise the
backup ZyWALL will never receive VRPT announcement. Please ensure the switch forwards
the multicast VRRP announcement (224.0.0.18) by enabling the "Unkown multicast flodding"
option in the switch setting.
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