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MX-Series Switch Control Board (SCB) Description

 

At the heart of the MX Series 5G Universal Routing Platform is the Switch and Control Board (SCB). The SCB is a single-slot card and has a carrier for the routing engine in the front. It has three primary functions: switch data between the line cards, control the chassis, and house the routing engine.

The MX-Series SCB:

  • Controls power to MPCs

  • Manages clocking, resets and boots

  • Monitors and controls systems functions, such as the fan speed, Power Distribution Module (PDM) status, and the system front panel.

The switch fabric is Integrated into the SCB, interconnecting all the DPCs and MPCs within the chassis and supporting up to 48 Packet Forwarding Engines. The routing engine installs directly into the SCB.

The number of SCBs supported varies, depending on the MX chassis and the level of redundancy. The MX240 and MX480 require two SCBs for 1+1 redundancy, whereas the MX960 requires three SCBs for 2+1 redundancy.

There are four generations of SCBs for the MX Series 5G Universal Routing Platform: SCB-MX, SCBE-MX, SCBE2-MX, and SCBE3-MX.

  • SCB-MX is the first-generation switch control board. The SCB-MX is designed to work with first-generation DPC line cards.

  • The SCBE-MX is the second generation switch control board and is designed specifically for use with MPC3E line cards to provide full line-rate performance and redundancy without a loss of bandwidth.

  • The SCBE2-MX provides improved fabric performance for high-capacity line cards using the third generation fabric XF2 chip (MPC4E, MPC5E, MPC2/3 NG, and MPC7E).

  • The SCBE3-MX Enhanced Switch Control Board provides improved fabric performance and bandwidth capabilities for high-capacity line cards using the ZF-based switch fabric.

Table 1 compares the SCB capacities of the MX Series 5G Universal Routing Platforms.

Table 2 lists the supported routing engines per SCB.

Table 1: Switch Control Board Capacities for MX Series 5G Universal Routing Platforms (Full-Duplex)

Description

Fabric Bandwidth Per Slot

MX240 Fabric Bandwidth

MX480 Fabric Bandwidth

MX960 Fabric Bandwidth

Enhanced MX Switch Control Board (SCBE3-MX)

Up to 1.5 Tbps (non-redundant fabric configuration with MPC10E line cards); 1 Tbps (redundant fabric configuration with MPC10E line cards)

Up to 6 Tbps

Up to 18 Tbps

Up to 33 Tbps

Enhanced MX Switch Control Board (SCBE2-MX)

Up to 480 Gbps (non-redundant fabric configuration); 340 Gbps (redundant fabric configuration)

Up to 1.92 Tbps

Up to 5.76 Tbps

Up to 10.56 Tbps

Enhanced MX Switch Control Board (SCBE-MX)

Up to 240 Gbps (non-redundant fabric configuration); 160 Gbps (redundant fabric configuration)

Up to 930 Gbps

Up to 2.79 Tbps

Up to 5.25 Tbps

Switch Control Board (SCB-MX)

Up to 240 Gbps (non-redundant fabric configuration); 120 Gbps (redundant fabric configuration)

Up to 465 Gbps

Up to 1.39 Tbps

Up to 2.6 Tbps

Table 2: Supported Routing Engines for MX Series 5G Universal Routing Platforms Switch Control Boards

Switch Control Board

First Supported Routing Engines

SCBE3-MX

RE-S-1800x2

RE-S-1800x4

RE-S-X6-64G

RE-S-X6-128G

RE-S-X6-64G-LT

SCBE2-MX

RE-S-1300 (EOLed)

RE-S-2000 (EOLed)

RE-S-1800*

RE-S-X6*

SCBE-MX

RE-S-1300 (EOLed)

RE-S-2000 (EOLed)

RE-S-1800*

SCB-MX

RE-S-1300 (EOLed)

RE-S-2000 (EOLed)

RE-S-1800

* All variants

Note

All routing engines are backward-compatible but not forward-compatible across SCBs. For example, RE-S-X6-128G is compatible with SCB-MX but RE-S-1300 is not compatible with SCBE3-MX.

CLI Identification

The SCBs are identified in the CLI as:

SCB Model

CLI Identification

SCB-MX

MX SCB

SCBE-MX

Enhanced MX SCB

SCBE2-MX

SCBE2-MX-S

SCBE3-MX

SCBE3-MX-S

user@host> show chassis hardware | match SCB
user@host> show chassis hardware models | match SCBE
user@host> show chassis hardware models | match SCBE2
user@host> show chassis hardware models | match SCBE3