Per-subscriber MTU for dynamic profiles of IP v4 or IPv6 protocol family

Maximum transmission unit (MTU) can be configured per subscriber for dynamic profiles. The value of MTU can be static or represented through $junos-interface-mtu variable. By default, the variable value is the MTU of the payload that is less than the MTU of the physical interface and the family protocol overhead. A specific value is returned through RADIUS authentication through the framed MTU attribute. If the RADIUS fails to return framed MTU value for $junos-interface-mtu variable then the default value from interface-mtu statement at [edit dynamic-profiles profile-name predefined-variable-defaults] hierarchy level. You can configure value for mtu statement at [edit dynamic-profiles name interfaces name unit name family inet] hierarchy level or at [edit dynamic-profiles name interfaces name unit name family inet6] hierarchy level.