Unable to Bring up TUN/TAP Devices

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Issue

TUN/TAP devices other than swp* interfaces do not pass traffic.

Environment

  • Cumulus Linux 2.2.x

Resolution

Upgrade to Cumulus Linux 2.5.0 or later.  This issue was previously tracked by internal engineering defect CM-3788.

Root Cause

The Cumulus Linux patch network-tun-no-carrier.patch disabled default TUN/TAP behavior in order to prevent link flap during switchd restart.

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