When configuring a pppoe interface with dhcpv6-pd, it costs more time for VyOS to reboot/shutdown since [email protected] cannot stop gracefully when VyOS shutdowns. The systemd unit waits for 30s to be killed.
The bug is due to wrong order of [email protected] and [email protected]. When shuting down, the [email protected] exits immediately so the pppoe interface is down. But without interface pppoe0, [email protected] cannot stop.