QTECH QSW-8300 Инструкция по настройке - Manual (Page 168)

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23.5 DHCP Troubleshooting
If the DHCP clients cannot obtain IP addresses and other network parameters, the following
procedures can be followed when DHCP client hardware and cables have been verified ok.
Verify the DHCP server is running, start the related DHCP server if not running. If the DHCP
clients and servers are not in the same physical network, verify the router responsible for
DHCP packet forwarding has DHCP relay function. If DHCP relay is not available for the
intermediate router, it is recommended to replace the router or upgrade its software to one that
has a DHCP relay function.
In such case, DHCP server should be examined for an address pool that is in the same
segment of the switch VLAN, such a pool should be added if not present, and (This does not
indicate switch cannot assign IP address for different segments, see solution 2 for details.)
In DHCP service, pools for dynamic IP allocation and manual binding are conflicting, i.e., if
command “network-address” and “host” are run for a pool, only one of them will take effect;
furthermore, in manual binding, only one IP-MAC binding can be configured in one pool. If
multiple bindings are required, multiple manual pools can be created and IP-MAC bindings set
for each pool. New configuration in the same pool overwrites the previous configuration.