DHCPSNP/4/DROPDHCPPACKET

Message

DHCPSNP/4/DROPDHCPPACKET: DHCP [PacketType] packet received from interface [IfName] in VLAN [VlanId] was discarded because DHCP snooping binding tables on the interface reached the maximum number of users.

Description

The number of table entries bound to an interface exceeded a predefined threshold, and DHCP packets were discarded on the interface.

Parameters

Parameter Name	Parameter Meaning
PacketType	Packet type
IfName	Interface name
VlanId	VLAN ID

Possible Causes

The number of users on a VLAN or interface exceeded the threshold, or an attacker was maliciously requesting for IP addresses on the live network.

Procedure

1. In the VLAN or interface view, run the display this command to view the allowable maximum number of users.

2. Redetermine whether to increase the allowable maximum number of valid users on the specified interface or in the specified VLAN.

If yes, go to Step 3.
If no, go to Step 4.

3. Run the dhcp snooping max-user-number max-user-number [ interface interface-type interface-number ] command in the VLAN view or the dhcp snooping max-user-number max-user-number command in the interface view to reconfigure the allowable maximum number of valid users. Check whether a log is recorded.

If yes, go to Step 4.
If no, no further action is required.

4. Collect log information and configuration information, and then contact technical support personnel.