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23.3 DHCP snooping operation
23.3.1 List of operation commands
The following table describes the operation commands for DHCP snooping.
Table 23-7 List of operation commands
Command name
show ip arp inspection statistics
clear ip arp inspection statistics
show ip dhcp snooping
show ip dhcp snooping binding
clear ip dhcp snooping binding
show ip dhcp snooping statistics
clear ip dhcp snooping statistics
23.3.2 Checking DHCP snooping
(1) Checking information about DHCP snooping
Use the
show ip dhcp snooping
snooping. This command displays the status of permission for the packets with Option 82,
whether the source MAC addresses of DHCP packets can be checked, and a list of VLANs
on which DHCP snooping is running.
The following figure shows the results of executing the
command.
Figure 23-15 Results of executing show ip dhcp binding
> show ip dhcp snooping
Date 2008/11/13 16:34:10 UTC
Switch DHCP snooping is Enable
Option allow untrusted: off,
DHCP snooping is configured on the following VLANs:
1,10,100,1000
Interface
fastethernet
fastethernet
:
:
port-channel
port-channel
>
(2) Checking the binding database
Use the
show ip dhcp snooping binding
the binding database. The information includes the MAC addresses and IP addresses of
terminals and the aging time of the binding database.
Description
Displays the dynamic ARP inspection statistics.
Clears the dynamic ARP inspection statistics.
Displays DHCP snooping information.
Displays information about the DHCP snooping binding database.
Clears information in the DHCP snooping binding database.
Displays the DHCP snooping statistics.
Clears the DHCP snooping statistics.
operation command to display information about DHCP
Verify mac-address: on
Trusted Verify source
0/1
no
off
0/2
yes
off
1
no
off
2
yes
off
show ip dhcp snooping
Rate limit(pps)
unlimited
unlimited
200
unlimited
operation command to display the information in
23 DHCP Snooping
operation
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