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Illustration
Switch A is connected to the user network; the uplink port is connected
to the DHCP relay device and then connected to DHCP Server. It can be
directly connected to the DHCP server. Here, the DHCP Snooping function
is enabled on switch A ; the IP Source Guard function is configured on
the port connected to the user network. When the DHCP works normally,
IP Source Guard gets the dynamical binding base generated by the DHCP
Snooping function and the got valid users are all regarded as legal users.
Only the IP packets sent by the legal users are allowed to pass from
Switch A and the IP packets sent by the other users are directly filtered.
Meanwhile, if there are users with fixed IP in the environment, the static
binding table needs to be configured to control.
Global configuration:
Command
Description
switch#configure terminal
Enter the global configuration mode
switch(config)#dhcp-snooping
Enable the DHCP Snooping function
switch(config)#exit
Exit the global configuration mode
Port configuration:
Command
Description
switch(config)# port 0/1
Enter the port configuration mode
switch(config-port-0/1)#dhcp-snooping limit-rate 66 Configure the port rate as 66pps
switch(config-port-0/1)#no dhcp-snooping trust
Set the port status as un-trust
switch(config-port-0/1)# ip verify source
Enable the IP Source Guard function
in IP address filtering mode
switch(config-port-range)#port 0/0
Enter port 0/0 configuration; suppose
port 0/0 is connected to the network
of the DHCP server.
switch(config-port-0/0)#dhcp-snooping trust
Set the port status as trust
switch(config-port-0/0)#exit
Exit the port configuration mode
Monitoring and Debugging
M o n i t or i n g C om m a n d
For example:
Command
Description
switch#show ip source
guard
Display the configuration information of the IP Source
Guard function
switch#show ip binding
table
Display the information of the static binding table
Содержание 065-7434
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Страница 245: ...245 SIGNAMAX LLC www signamax eu Application Example Example of configuring DHCP Snooping ...
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Страница 655: ...287 SIGNAMAX LLC www signamax eu Sub VLAN members in the system ...