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Routing Engines for the M7i and M10i Routers

The Routing Engine is an Intel-based PCI platform that runs JUNOS Internet software. Software processes that run on the Routing Engine maintain the routing tables, manage the routing protocols used on the router, control the router's interfaces, control some chassis components, and provide the interface for system management and user access to the router.

The Routing Engine is installed into the midplane from the front of the chassis. When two Routing Engines are installed, both are powered on, but only one is active (the master); the second Routing Engine is in standby mode and performs no functions. At boot time, both Routing Engines run an arbitration algorithm and elect one as master.

If the host system is redundant, the backup Routing Engine is hot-removable and hot-insertable, but the master Routing Engine is hot-pluggable. A Routing Engine that is not redundant is hot-pluggable. You can remove and replace the master Routing Engine without powering down the router, but the routing functions of the system are interrupted when the component is removed. A backup Routing Engine can be removed without interrupting routing functions.

Routing Engine Components

The Routing Engine (shown in Figure 11) is a single-board system with the following components:

The boot sequence for the three storage media is as follows: the PC Card (if present), then the internal flash disk (if present), then the hard disk.

Figure 11: Routing Engine for the M7i and M10i Routers

Image g003232.gif

Table 4: States for Routing Engine LEDs

Label

Color

State

Description

HDD

Green

Blinking

There is read/write activity on the PC Card.

MASTER

Blue

On steadily

Routing Engine is functioning as master. On an M7i router, this LED is always lit.

FAIL

Red

On steadily

Routing Engine is not operational.

ONLINE

Green

On steadily

Routing Engine is running normally.

Tools and Parts Required

To replace a Routing Engine, you need the following tools and parts:

Replacing the Routing Engine in an M7i Router

To replace the Routing Engine in an M7i router, perform the following procedures:

Replacing a Routing Engine in an M10i Router

To replace a Routing Engine in an M10i router, perform the following procedures:


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