SNMP support for dual-stack subscriber secure policy traffic mirroring

Subscriber secure policy traffic mirroring now provides dual-stack support for DHCP and PPP subscribers. Dual-stack support enables the router to activate both IPv4 and IPv6 traffic mirroring at different times. As part of the dual-stackenhancements, Junos OS Release 11.4 also includes a new SNMP object to identify the mirrored IPv6 traffic, and two existing SNMP objects that are modified to track IPv6 traffic statistics.