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d0773aabea
Sequence diagram: drop the phantom "port fwd_mask 0xfffd" step — uBridge sets the per-port mask inside brctl addif and gns3-server never sends it. Frame path: explain the ingress/egress mechanism in prose (the TAP-fd write lands at the sender's anchor ingress, where nothing is installed; the bridge's forward out the far anchor is the egress transmission the tc chain sits on), and group the netio mailboxes into a kernel subgraph matching the relay diagram. Suspend: a down anchor answers EIO on the TAP fd in both directions (the section B hardening), not reads-block. Term table: the anchor shape is per Ethernet bay (4 units per bay), not the default 2x4. Link operations: carrier up is applied last, matching _attach_kernel_nio. Link-local: note the verification matrix runs on the Docker datapath. Reflow paragraphs to the soft-wrap convention.