PPPoE connect and disconnect - how are these different to configuration disable on an interface?

I’m testing some IPv6 changes on the PPPoE interface on my VyOS box.

I noticed the docs mention a connect, and disconnect command for PPPoE here:

However, I made some configuration changes (e.g. enabled DHCPV6-PD, and SLAAC etc) - I then tried to disconnect and reconnect on the PPPoE interface, but nothing seemed to happen, and it didn’t show IPv6 addresses.

I then went into configuration mode, and did:

set interfaces pppoe pppoe0 disable
commit
delete interfaces pppoe pppoe0 disable
commit

And show interfaces showed some changes after that - just curious what connect and disconnect do, and how they might be different to simply administratively disabling the interface?

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