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Technical Announcement Regarding the Issue of Large Scale of Access Device MAC Tables Caused by the IPv6 ND Snooping Switch on by Default on the SeeerEngine-Campus Controller

2021-10-26 18:35:11 Published
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Product Model

SeerEngine-Campus


Involved Version

SeerEngine-Campus E3306 (inclusive) to E3311 (inclusive) versions


Problem Description

When creating a Layer 2 network domain on the SeerEngine-Campus controller, the IPv6 ND Snooping switch is enabled by default. When IPv6 services are not deployed in the Layer 2 network domain, turning on the IPv6 ND Snooping switch will cause the size of the MAC table of the Access device to increase, and there is a risk that the MAC table of the Access device will exceed the specifications.


Cause Analysis

When the IPv6 ND Snooping switch is enabled on the controller and IPv6 services are not deployed in the Layer 2 network domain, the controller only issues IPv6 ND Snooping configurations to Spine and Leaf devices. In this case, the Spine and Leaf devices process the IPv6 NA packet sent by the terminal and flood the NA packet in the service VXLAN. If terminals in multiple VLANs of the Access device are authenticated and authorized the service VXLAN, the terminal NA messages will be flooded in these VLANs, and then the same Access device learns the same terminal MAC information through different VLANs.

When a large number of terminal NA packets are flooded in the service VXLAN, the size of the MAC table of the Access device will increase. If the MAC table of the Access device exceeds the specifications, it may cause the Access device to operate abnormally.



Workaround/Solutions

Workaround:

Enter the Automation-Campus Network-Private Network-Layer 2 Network Domain menu of the SeerEngine-Campus controller, click the Modifybutton of the Layer 2 network domain, and then set the IPv6 ND Snooping switch under the Advanced tab Is no.



Solution

Upgrade SeerEngine-Campus to E3311P01 (inclusive) and above.

Create a new Layer 2 network domain under the above SeeerEngine-Campus controller version, and the IPv6 ND Snooping switch is not enabled by default

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