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By default, an interface does not use DHCP for IP address acquisition.
Note that:
■ If no parameter is specified, the client uses a character string comprised of the
current interface name and MAC address as its ID for address acquisition.
■ The DHCP client sends a DHCP-RELEASE message for releasing the IP address
obtained via DHCP, if the interface of the client is down, the message cannot
be sent.
■ For a sub interface that obtained an IP address via DHCP, using the shutdown
command on its primary interface does not make the DHCP client send a
DHCP-RELEASE message for releasing the sub interface’s IP address.
Example # Configure interface Ethernet 1/0 to use DHCP for IP address acquisition.
<Sysname> system-view
[Sysname] interface ethernet 1/0
[Sysname-Ethernet1/0] ip address dhcp-alloc
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■ The DHCP snooping is supported only on the Layer 2 Ethernet interface.
■ DHCP Snooping supports no link aggregation. If a Layer 2 Ethernet interface is
added into an aggregation group, DHCP Snooping configuration on it will not
take effect. When the interface is removed from the group, DHCP Snooping
can take effect.
■ The DHCP snooping enabled device does not work if it is between the DHCP
relay agent and DHCP server, and it can work when it is between the DHCP
client and relay agent or between the DHCP client and server.
■ The DHCP Snooping enabled device cannot be a DHCP server or DHCP relay
agent.
■ You are not recommended to enable the DHCP client, BOOTP client, and DHCP
Snooping on the same device. Otherwise, DHCP Snooping entries may fail to
be generated, or the BOOTP client/DHCP client may fail to obtain an IP address.
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Only the H3C MSR series routers installed with the 16-port or 24-port switching
card support DHCP snooping.