This knowledge base has moved to the documentation site. Please visit the knowledge base here for the most up to date content. This site is no longer maintained.

Is It Possible to SPAN to the Switch CPU?



I would like to capture/display packets from the switch data plane via tcpdump from the switch control plane.


  • Cumulus Linux, 2.5.x


SPAN to the CPU is not possible. SPAN should be used from one switch port to another, with tcpdump run from a connected host. For more information refer to the following:



This support portal has moved

Cumulus Networks is now part of the NVIDIA Networking Business Unit! The NVIDIA Cumulus Global Support Services (GSS) team has merged its operations with the NVIDIA Mellanox support services team.

You can access NVIDIA Cumulus support content from the Mellanox support portal.

You open and update new cases on the Mellanox support portal. Any previous cases that have been closed have been migrated to the Mellanox support portal.

Cases that are still open on the Cumulus portal will continue to be managed on the Cumulus portal. Once these cases close, they will be moved to the Mellanox support portal.

Powered by Zendesk