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Control Plane Architecture for a Routing Matrix with a TX Matrix Plus Router

 

The routing matrix contains two control planes. All master Routing Engines in the TX Matrix Plus router and line-card chassis (LCC) are on one control plane; all backup Routing Engines are on another control plane (see Figure 1).

Figure 1: Routing Matrix Routing Engine Connections
Routing Matrix Routing Engine
Connections

To manage the Routing Engines on a control plane, you must be logged into the Routing Engine in the TX Matrix Plus router on that control plane. For example, you must be logged into the backup Routing Engine in the TX Matrix Plus router to upgrade the software of all backup Routing Engines in the routing matrix.

Figure 2 illustrates the control plane architecture. Each TX Matrix Plus Routing Engine connects through a 10-Gbps link to a high-speed switch located in the corresponding Control Board within the host subsystem.

Figure 2: Routing Matrix Control Plane Architecture
Routing Matrix Control Plane
Architecture

The high-speed switch in the Control Board provides a 1-Gbps link to each Routing Engine in the LCCs. The 1-Gbps links are provided through the UTP Category 5 Ethernet cable connections between the TXP-CIPs in the TX Matrix Plus router and the LCC-CBs in the LCCs. For more information about connecting TXP-CIPs to LCC-CBs, see Control Plane Connections from the TX Matrix Plus Router to the Line-Card Chassis.

The kernel synchronization process running on each LCC Routing Engine synchronizes the forwarding table on the TX Matrix Plus Routing Engine with the forwarding table on the LCC. The Junos kernel running on each LCC Routing Engine copies its forwarding table to all Packet Forwarding Engines in the LCC.