Digiweb's ONT delivers its untagged management traffic (192.168.100.0/24)
alongside the tagged ISP VLAN 10. The switch feeding river now tags the ONT's
untagged port as wan-pon-ont (140) and swaps the ISP VLAN 10 to wan-pon-isp
(141) on ingress, so both reach river single-tagged: river takes an address in
the ONT's /24 on 140 to reach its web UI, and PPPoE runs directly on 141.
Replaces the old QinQ-into-131 (wanStacked) transport; the wan-pon (131) VLAN
constant is dropped and prefixes.ont added.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>