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ff41a54364
The L2-anchor spec's behavioral guarantee — an idle link stays silent for 5 s once the enslavement burst settles — only ran in the Dynamips and Docker suites. It now also runs in QEMU, IOU, the IOL container, the switch fast path and the switch cascade, which covers every host-device creation path: * tap create (Dynamips/QEMU/IOU anchors), docker create_veth (Docker host ends; the cascade's race-loser end is hardened after create by the server), bridge add_nio_tap (the IOL container anchor, the fifth creator), and the brctl switch bridges, whose multicast snooping is off precisely so the bridge role can reach silence; * each scenario silences its guests first (IOS interfaces shut through the console; Docker guests' links down) and re-verifies the ping after; * the cascade measures 8 devices at once (four absorbed router anchors, both cascade ends, both switch bridges). IOL 158 s, cascade 293 s, ESW fast path 378 s, QEMU 428 s, IOU 308 s — all green.