The sub-id and brg-id strings can be changed online with CLI and CoA/RAR (RADIUS and Diameter interfaces). Conversion between any combination of long and short sub-ids and short brg-ids is supported by moving each IPoE/PPPoE session or host under a new or renamed subscriber. This is performed by:
CoA
tools commands:
tools>perform>subscr-mgmt>edit-ipoe-session subscriber
tools>perform>subscr-mgmt>edit-lease-state subscriber
tools>perform>subscr-mgmt>edit-ppp-session subscriber
tools>perform>subscr-mgmt>edit-slaac-host subscriber
The above commands must be run separately for each host or session of the subscriber that is renamed.