Switch Control Boards; Mx2000 Adc; Routing Engines And Cb-Res - Juniper MX2020 Hardware Manual

Universal routing platform

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All switch fabric boards in the chassis must be the same type. Mixed mode is not

Switch Control Boards

Switch Control Boards (MX-SCB, MX-SCBE, MX-SCBE2, and MX-SCBE3) provide full line-rate performance

and redundancy without a loss of bandwidth. MX-series SCBs feature an integrated switch fabric that

connects to all slots in the chassis in a nonblocking architecture. The SCBs house the routing engine, control

power to MPCs, monitor and control system functions such as fan speed and the system front panel, and

manage clocking, resets, and boots. The SCB is a single-slot card and has a carrier for the routing engine

on the front.

SCBs install vertically in the MX2020, MX2010, and MX960 chassis, and horizontally in the MX480 and

MX240 chassis. The number of supported SBCs varies per router:

MX240 and MX480 routers— 2 SCBs for 1 + 1 MX SCB redundancy when used with the DPC line cards

MX960 router— 3 SCBs for 2 + 1 redundancy when used with the DPC line cards

MX2010 and MX2020 routers— 8 SCBs

The MX2000 ADC is a special line card adapter (ADC) that enables MX2010 and MX2020 routers to use

smaller form-factor MPCs (MPC1E, MPC2E, and MPC3E). The ADC is merely a shell that accepts line cards

in the front and converts power and switch fabric in the rear. ADCs install vertically in the MPC slot on

the front of the router. For more information about the MX2000 ADC, see

Description" on page

Routing engines and Control Boards with Routing Engines (CB-REs) provide the software processes that

run Junos OS. The routing engine maintains the routing tables, manages the routing protocols used on the

router, controls the router interfaces, controls some chassis components, and provides the interface for

system management and user access to the router. Each CB-RE is a combined Routing Engine and Switch

Control Board in one unit.

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