ZyXEL Communications VPN Series Handbook page 801

What can go wrong
1. Configure all the related setting on LAG interface before you connect the link.
2. Make sure you have the corresponding setting on your switch if using 802.3ad
(LACP).
3. Check the Xmit Hash policy or the link monitoring method.
To adjust the sensitivity of the updelay and downdelay when using active-backup
4.
or blance-alb mode.
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