Need adding vyos cli syntax for service pppoe server, I propose next
#set service pppoe-server authentication local-users username <username> rate-limit Possible completions: download Set download speed limit (bit/s) upload Set upload speed limit (bit/s)
And add to pppoe.conf section [cli] with params for displaying current user rate-limit
[cli] sessions-columns=ifname,username,ip,calling-sid,rate-limit,state,uptime,rx-bytes,tx-bytes