ZyXEL Communications GS2210 Series - What Could Go Wrong

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6.1.4 What Could Go Wrong
1 If the MAC address of the IP Phone is not assigned to the VLAN
100 successfully, please check if the IP Phone supports
LLDP-MED. LLDP-MED must be enabled on the switch.
2 Since the IP Phone is assigned a VLAN ID via the function of
the Network Policy in LLDP-MED, The voice traffic from the
switch must be tagged backed to the IP Phone. Port 1 in VLAN
100 on the Switch should be tagged out (Check TX tagging) so
that the Switch can ping the IP Phone successfully.
3 Since the IP Phone is assigned a VLAN ID via the function of
the Network Policy in LLDP-MED, please make sure the IP
Phone either supports LLDP-MED, or has LLDP-MED enabled.