Subscriber Management and Services

Support for subscriber service redundancy on DHCP server (MX Series)—Starting in Junos OS Release 21.4R1, you can enable M:N subscriber service redundancy using active leasequery for the DHCP server running on an MX Series broadband network gateway (BNG). The subscriber service redundancy on the DHCP server ensures uninterrupted subscriber services when you reboot or replace the primary server, or when the primary server has any hardware failures such as access link failures, access line-card failure, or chassis failure.

[See M:N Subscriber Service Redundancy on DHCP Server.]

Subscriber service reauthentication on actual data rate change (MX Series)—Starting in Junos OS Release 21.4R1, the DHCP server reauthenticates the subscriber service when the actual data rate changes. This reauthentication is an alternative to RADIUS change of authorization (CoA) to change subscriber session characteristics based on the actual data rate change without interrupting the subscriber service.

You can enable the reauthentication feature using the actual-data-rate-change statement at the [edit system services dhcp-local-server reauthenticate] hierarchy level. You can also configure a threshold value for the actual-data-rate-change downstream and upstream DSL attributes at the [edit system services dhcp-local-server reauthenticate actual-data-rate-change] hierarchy level.

[See reauthenticate (DHCP Local Server), show subscribers, and show network-access aaa statistics re-authentication.]

Load-balancing support for subscriber traffic on pseudowire service interface (MX240, MX480, and MX960)—Starting in Junos OS Release 21.4R1, we support load balancing for subscriber sessions on the pseudowire service interface over multiple logical tunnel child member links of a redundant logical tunnel (RLT) interface at the same time. The load balancing property of the RLT interface allows subscriber traffic on the pseudowire service interface to be dispersed and load-balanced over different PICs and line cards. Service providers can enable BNG subscriber sessions on the PS interface with the support of multiple active links.

An RLT interface allows up to a maximum of 32 member LT interfaces. This redundancy protects the access and the core-facing link against anchor Packet Forwarding Engine failure across line cards.

[See Pseudowire Subscriber Logical Interfaces Overview.]

CoS support for BNG on pseudowire service interface over active-active RLT interface (MX240, MX480, and MX960)—In Junos OS Release 21.4R1, we've introduced CoS support for a BNG on subscriber-interface on pseudowire over an active-active redundant logical tunnel (RLT) interface for subscriber applications such as DHCP and PPPoE. This CoS property is achieved by providing the scheduling nodes for the logical tunnel links. For dynamic interfaces, interface sets, static underlying interfaces, and dynamic underlying interfaces over RLT, CoS allocates scheduling nodes for each link in the RLT, which has multiple logical tunnel links in active-active mode. In case of targeted interfaces and targeted interface sets, which have primary and backup links, CoS allocates scheduling nodes on the primary and backup links to optimize the use of scheduling nodes. Traffic for the subscriber targeted interfaces will be distributed to all the primary LT links when CoS is applied at the subscriber level.

When you enable targeting in a node, you must enable targeting for all the child nodes for CoS to function properly. Also, you must configure the network-services enhanced-ip at the [edit chassis] hierarchy level because this feature works only in enhanced IP mode.

[See Anchor Redundancy Pseudowire Subscriber Logical Interfaces Overview, targeted-options (PS interface), logical-interface-fpc-redundancy (PS interface), rebalance-subscriber-granularity, show interfaces demux0 (Demux Interfaces).]