Drop Dhcp Packets On Snooped Vlans Only - Dell Force10 Z9000 Configuration Manual

Database write-delay (In minutes)
DHCP packets information
Relay Information-option packets
Relay Trust downstream packets
Snooping packets
Packets received on snooping disabled L3 Ports
Snooping packets processed on L2 vlans
DHCP Binding File Details
Invalid File
Invalid Binding Entry
Binding Entry lease expired
List of Trust Ports
List of DHCP Snooping Enabled Vlans
List of DAI Trust ports
Displaying the Contents of the DHCPv6 Binding Table
To display the contents of the DHCP IPv6 binding table, use the following command.
• Display the contents of the binding table.
EXEC Privilege mode
show ipv6 dhcp snooping biniding
Example of the show ipv6 dhcp snooping binding Command
View the DHCP snooping statistics with the show ipv6 dhcp snooping command.
Dell#show ipv6 dhcp snooping binding
Codes : S - Static D – Dynamic
IPv6 Address MAC Address
=========================================================================
11:11::22 11:22:11:22:11:22
33::22 11:22:11:22:11:23
333:22::22 11:22:11:22:11:24
Debugging the IPv6 DHCP
To debug the IPv6 DHCP, use the following command.
• Display debug information for IPV6 DHCP.
EXEC Privilege mode
debug ipv6 dhcp
IPv6 DHCP Snooping MAC-Address Verification
Configure to enable verify source mac-address in the DHCP packet against the mac address stored in the snooping binding table.
• Enable IPV6 DHCP snooping .
CONFIGURATION mode
ipv6 dhcp snooping verify mac-address

Drop DHCP Packets on Snooped VLANs Only

Binding table entries are deleted when a lease expires or the relay agent encounters a DHCPRELEASE.
Line cards maintain a list of snooped VLANs. When the binding table fills, DHCP packets are dropped only on snooped VLANs, while
such packets are forwarded across non-snooped VLANs. Because DHCP packets are dropped, no new IP address assignments are
made. However, DHCP release and decline packets are allowed so that the DHCP snooping table can decrease in size. After the
table usage falls below the maximum limit of 4000 entries, new IP address assignments are allowed.
: 0
: 0
: 0
: 0
: 0
: 142
: 0
: 0
: 0
:Te 1/4
:Vl 10
:Te 1/4
Expires(Sec) Type VLAN
120331 S
120331 S
120331 D
Interface
Vl 100 Te 1/1
Vl 200 Te 1/1
Vl 300 Te 1/2
Dynamic Host Configuration Protocol (DHCP)
233