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Two switches cascaded through the link-owned veth pair, two c7200 routers per switch, real ICMP crossing both bridges: the pair is born UP with exactly one end per switch bridge, a dot1q trunk cascade carries two VLANs at once, the symmetric access/trunk mode flip on the cascade ends isolates and revives a VLAN in place (asymmetric flips are semantically broken — the access side egresses untagged into the far trunk's native PVID), a delay filter lands as netem on both ends (one per direction, RTT ~= 2x delay), suspend admin-downs both ends, and a link delete/re-create retires the whole pair and mints a new one under the new link id — zero host residue after the project goes.