Zyxel ZyWALL USG 2000 [167/185] Zywall usg support notes

Zyxel USG100-PLUS [167/185] Zywall usg support notes
ZyWALL USG Support Notes
167
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interfaces link is down, Link Monitor shuts down all of the masters VRRP
interfaces except the failure interface so the backup ZyWALL takes over completely.
L05. Why do both the VRRP interfaces of master ZW USG and
backup ZW USG are activated at the same time?
Since the ZWUSG master sends multicast VRRP announcement to backup ZWUSG
periodically, if the backup ZWUSG doesn't receive the VRRP announcement, it will
activate its VRRP interfaces.
For the application scenario if the VRRP interface of master and backup ZWUSG
connect to a switch, the switch MUST forward the VRRP multicast to the backup
ZWUSG. 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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