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c0568dc25f
The cloud node offered the kernel datapath's host-side interfaces — node anchors (gv/gq/gi/gd/gx/gp), switch cascade veth ends (gs) and cross-compute VXLAN devices (gvl) — in its interface list and even pre-filled them as ports on a freshly created cloud: none of them is flagged special and only "gns3*" names were filtered. These interfaces belong to the link or node that created them for the project's whole lifetime, so bridging a cloud to one would race its owner. Add is_kernel_datapath_interface() next to the naming contract in utils/kernel_anchor.py: exact-shape matching (prefix plus its fixed-length id-derived tail), so a user interface that merely starts with "gv" is never swallowed. The cloud keeps managed names out of its host-interface list and default ports mapping, while saved mappings keep working (the existence checks still see the full interface list).