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Updated on 2024-01-25 GMT+08:00

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ALM-3276800477 The number of ND packets that were discarded on an interface because they did not match the binding entries exceeded the threshold

Description

DHCP/1/NDBINDCHECKTRAP:OID [OID] The number of the discarded ND packets that do not match the binding table exceeds the threshold on the interface. (Interface=[OCTET], VlanID=[INTEGER], LastDroppedSourceMac=[OCTET], DiscardedNumber=[INTEGER])

The number of ND packets that were discarded on an interface because they did not match the binding entries exceeded the threshold.

Attribute

Alarm ID	Alarm Severity	Alarm Type
3276800477	Critical	Equipment alarm

Parameters

Name	Meaning
OID	Indicates the MIB object ID of the alarm.
Interface	Interface name.
VlanID	VLAN ID.
LastDroppedSourceMac	Source MAC address of the last discarded packet.
DiscardedNumber	Number of discarded packets.

Impact on the System

Invalid ND packets are discarded.

Possible Causes

Attacks from bogus ND users were received.

Procedure

Run the display nd snooping user-bind command to check information about ND snooping binding entries on the interface and determine the interface or VLAN from which the user goes online based on the source MAC address of the last discarded packet.
Obtain the ND packets received on the interface or in the VLAN using the port mirroring method.
- If a user connected to the interface sends a large number of ND packets that do not match the binding entries, the user is an unauthorized user and the sent packets are attack packets. The device discards the attack packets. Check the attack source based on the user's IPv6 address or MAC address.
- If a user connected to the interface does not send a large number of ND packets that do not match the binding entries, the packets sent by the user are not attack packets. To ensure that the users pass the check, cancel the nd snooping check { na | ns | rs } enable command configuration on the interface.