TX Matrix Plus Component Redundancy
The TX Matrix Plus router is designed so that no single point of failure can cause the entire system to fail. The following major hardware components are redundant:
- Data Switching Planes—In the TX Matrix Plus router, one data switching plane consists of one or two TXP-F13 SIBs connected internally through the midplane to four TXP-F2S SIBs. For the TXP-4 configuration, there are a total of five data switching planes in the routing matrix. One of the five data switching planes acts as a backup spare to the remaining data switching planes. If faults are detected in an active data switching plane, the plane is taken offline, and the backup spare plane is brought online. When a failed component is replaced and brought online, the data switching plane in which it resides becomes the new backup spare plane.
- Host subsystem—The host subsystem consists of a
Routing Engine functioning together with a TXP-CB. The TX Matrix Plus
router can have one or two host subsystems. To operate, each host
subsystem requires a Routing Engine installed directly into the TXP-CB.
If two host subsystems are installed, one functions as the master
and the other functions as the backup.
If the master host subsystem (or either of its components) fails, the backup can take over as the master. For information about the effect of taking the host subsystem offline, see Taking the Host Subsystem Offline. For more information about high availability features, see the Junos High Availability Configuration Guide.
- TXP-CIPs—The TX Matrix Plus router has two TXP-CIPs.
Each TXP-CIP provides the ports for the control plane connections
to the Control Boards (LCC-CBs) in up to four T1600 routers.
Note: The remaining ports are reserved for future use.
If the master TXP-CIP fails, the backup TXP-CIP provides redundant connections to the active host subsystem in the TX Matrix Plus router and the active LCC-CBs in the T1600 routers. In this case, the Routing Engines in the TX Matrix Plus router and T1600 routers do not perform a switchover to their backups.
- Power supplies—The TX Matrix Plus router has two power supplies, which share the load evenly. If one power supply fails, the other power supply can provide full power to the TX Matrix Plus router indefinitely.
- Cooling system—The cooling system has redundant components, which are controlled by the host subsystem. If one of the fans fails, the host subsystem increases the speed of the remaining fans to provide sufficient cooling for the TX Matrix Plus router indefinitely.
