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Commands for DHCP
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26.2.4 ip helper-address
Command: ip helper-address <ip-address>
no ip helper-address <ip-address>
Function: Specifies the destination address for the DHCP relay to forward UDP packets.
The “no ip helper-address <ip-address>” command cancels the setting.
Default: None.
Command mode: Interface Configuration Mode
Usage Guide: The DHCP relay forwarding server address corresponds to the port
forwarding UDP, i.e. DHCP relay forwards corresponding UDP packets only to the
corresponding server instead of all UDP packets to all servers. When this command is
run after “ip forward-protocol udp <port>” command, the forwarding address
configured by this command receives the UDP packets from <port>. The combination of
“ip forward-protocol udp <port>” command and this command should be used for
configuration.
26.2.5 show ip forward-protocol
Command: show ip forward-protocol
Function: Show the configured port ID of the protocol which support the forwarding of
broadcast packets, it means the port ID for forwarding DHCP packets.
Command mode: Admin and configuration mode
Example:
Switch#show ip forward-protocol
Forward protocol(UDP port): 67(active)
26.2.6 show ip helper-address
Command: show ip helper-address
Function: Show the configuration relation for the port ID of the protocol (It can forward
broadcast packets), the interface (It supports forwarding function) and the forwarded
destination IP.
Command mode: Admin and configuration mode
Example:
Switch#show ip helper-address
Forward protocol Interface Forward server
67(active) Vlan1 192.168.1.1