vyos@vyos# show interfaces pppoe
 pppoe pppoe111 {
     address dhcpv6
     authentication {
         password vyos
         username vyos
     }
+    dhcpv6-options {
+        pd 0 {
+            interface dum0 {
+            }
+            interface dumL {
+            }
+        }
+    }
     source-interface eth1
 }
[edit]
vyos@vyos# commit
vyos@vyos#

vyos@vyos# set interfaces dummy dumL



  Dummy interface must be named dumN
  Value validation failed
  Set failed