BIRD: VXLAN data plane support

[ipspace]

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[Copilot]

Pull request overview

This PR adds VXLAN data-plane support for the BIRD daemon device type, enabling netlab to generate and apply VXLAN Linux dataplane configuration when BIRD is used as the control-plane daemon (primarily in containerlab).

Changes:

• Enable VXLAN as a required dataplane configuration step for BIRD in clab, and advertise VXLAN IPv6 VTEP capability.
• Add a BIRD VXLAN dataplane template that reuses the existing VXLAN FRR shell script and signals completion to the dataplane wait mechanism.
• Update documentation to reflect VXLAN dataplane support for BIRD.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
netsim/daemons/bird.yml	Enables VXLAN dataplane coordination for BIRD in clab and declares VXLAN feature support (vtep6).
netsim/ansible/templates/vxlan/frr.j2	Removes a trailing exit $? to allow reuse via template inclusion.
netsim/ansible/templates/vxlan/bird.j2	New VXLAN dataplane script for BIRD: includes VXLAN Linux script and touches /var/run/vxlan.done.
docs/platforms.md	Updates platform support tables to list BIRD VXLAN dataplane support.
docs/module/vxlan.md	Adds BIRD to VXLAN module platform support matrix.