Drop Dhcp Packets On Snooped Vlans Only - Dell Force10 S4810P Configuration Manual

High-density, 1ru 48-port 10gbe switch

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Table of Contents

View the DHCP Snooping statistics with the

FTOS#show ip dhcp snooping

IP DHCP Snooping

IP DHCP Snooping Mac Verification

IP DHCP Relay Information-option

IP DHCP Relay Trust Downstream

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

Drop DHCP packets on snooped VLANs only

Binding table entries are deleted when a lease expires or the relay agent encounters a DHCPRELEASE.

Starting with FTOS Release 8.2.1.1, line cards maintain a list of snooped VLANs. When the binding table

fills, DHCP packets are dropped only on snooped VLANs, while such packets will be forwarded across

non-snooped VLANs. Since 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. Once the table usage falls below the max limit of 4000 entries, new IP address assignments are

Dynamic Host Configuration Protocol (DHCP)

show ip dhcp snooping