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This command is to configure the relay address. After enabling OPTION 82, some servers need
the packets to carry the relay address, which must be configured as the IP address on the
device that can communicate with the DHCP server. Moreover, the L3 interface where the IP
address is located must be in the same VLAN with the client and server ports.
dhcp-snooping relay-address
ip-address
Syntax
Description
ip-address
Relay IP address
【
Default status
】
None
dhcp-snooping limit-rate
The command is to configure upper limit of DHCP packet rate on a port. When the DHCP
packet rate on a port exceeds the configured value, the packet is discarded. If the packets
received continuously in 20s exceed the rate, then the corresponding port is shutdown directly
and automatically recovers after 5 minutes. It can also be configured to recover manually.
The rate limit configuration of a trust port does not take effect, which means we can configure
the rate limit but it is not performed on the port unless we change the status of the port into
an untrust port.
dhcp-snooping limit-rate num
Syntax
Description
num
Upper limit of the rate
【
【
【
【
Default status
】
】
】
】
100pps
dhcp-
snooping
trust
This command is to configure the trust status of a port. In general, to configure the ports
connected to DHCP servers as trust ports, and configure other ports as untrust ports. By
default, the status of ports is untrust. For untrust ports, the DHCP responding packets
received from them are filtered.
dhcp-snooping trust
no dhcp-snooping trust
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