Use Case for a Routing Matrix with a TX Matrix Plus Router in a TXP-Mixed-LCC-3D Configuration

The TX Matrix Plus router is the centralized switch fabric of the routing matrix that interconnects multiple line-card chassis (LCCs) to build a multichassis routing matrix. In releases earlier than Junos OS Release 13.1, only the T1600 LCCs were supported on the routing matrix with the TX Matrix Plus router. In Junos OS Release 13.1 and later releases with enhanced Switch Interface Boards (SIBs), you have the flexibility to connect the TX Matrix Plus router to a hybrid configuration of T1600 and T4000 LCCs by means of additional interfaces and FPC types. This hybrid configuration is known as a TXP-Mixed-LCC-3D or a mixed-mode configuration in the routing matrix with a TX Matrix Plus router.

One of the use case scenarios for using the mixed-mode configuration is to support large-scale subscribers. For example, suppose you are using an existing routing matrix with a TX Matrix Plus router, you have retail subscribers on T1600 LCCs, and you need to provide services to both retail and enterprise subscribers on a single routing matrix that can work as a provider edge (PE) router. In such a situation, you can add T4000 LCCs to the existing routing matrix (by using the mixed-mode configuration) and use the routing matrix as a PE router. For more details on T1600 and T4000 router capabilities, see the T1600 Product Portfolio and T4000 Product Portfolio.

In a fully scaled routing matrix with a TX Matrix Plus router, the following combinations of T1600 and T4000 LCCs are supported:

• Six T1600 LCCs and one T4000 LCC

• Four T1600 LCCs and two T4000 LCCs

• Two T1600 LCCs and three T4000 LCCs

For other valid combinations of LCCs in the mixed-mode configuration, see the TX Matrix Plus Router Hardware Guide.