VLAN 1 Flood Traffic Flooded out from Ports Designated as Access Ports of other VLANs



In some configurations, flooded traffic from the primary VLAN ID of a bridge can be transmitted out of ports that are not assigned as a member of that VLAN. This can result in the associated broadcast, multicast and unknown destination traffic for the primary VLAN to be transmitted out from ports that should not receive the traffic.


  • Cumulus Linux 2.5.4


To work around this issue, execute the following commands for the bridge:

cumulus@switch:~$ sudo ifdown [bridge] 
cumulus@switch:~$ sudo ifup [bridge]

The Cumulus Linux http://repo.cumulusnetworks.com repository was updated with the latest security resolution to this issue.

This issue has a CVSS score of 3.4 (Low). We recommend that you upgrade Cumulus Linux and Cumulus RMP. 

For instructions on how to apply the latest security upgrades, please refer to this Help Center article. See also the Cumulus Linux 2.5.4 release notes

We would like to thank Collin Crowell for reporting this issue.

If you have any questions, please contact us.

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