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Dell Configuration Guide for the S4048–ON System 9.14.2.5

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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.
To view the number of entries in the table, use the show ip dhcp snooping binding command. This output displays the snooping binding table created using the ACK packets from the trusted port.
DellEMC#show ip dhcp snooping binding

Codes : S - Static D - Dynamic

IP Address  MAC Address         Expires(Sec) Type VLAN   Interface
================================================================
10.1.1.251  00:00:4d:57:f2:50   172800       D    Vl 10   Te 1/2
10.1.1.252  00:00:4d:57:e6:f6   172800       D    Vl 10   Te 1/1
10.1.1.253  00:00:4d:57:f8:e8   172740       D    Vl 10   Te 1/3
10.1.1.254  00:00:4d:69:e8:f2   172740       D    Vl 10   Te 1/5

Total number of Entries in the table : 4

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