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SCBE2-MX Description

 

The MX Enhanced Switch Control Board (SCBE2-MX) serves the carrier Ethernet services router and carrier Ethernet transport markets that require higher-capacity traffic support, demanding greater interface density (slot and capacity scale) as well as improved services. The SCBE2-MX is supported on MX960, MX480, and MX240 routers.

The SCBE2-MX is installed vertically in the MX960 chassis and horizontally in the MX480 and MX240 chassis. The routing engine is installed directly into a slot on the SCBE2-MX (see Figure 1).

Figure 1: SCBE2-MX
SCBE2-MX

Software release

  • Junos OS Release 13.3 R1 and later

  • Name in CLI: SCBE2

SCBE2-MX Weight and Dimensions

  • Weight: 9.6 lb (4.4 kg) (with Routing Engine installed)

  • Width: 17 in (43.2 cm)

  • Depth: 22 in (55.9 cm)

  • Height: 1.25 in (3.2 cm) height.

Maximum Power Requirements

SCBE2-MX (applies to MX240, MX480, and MX960)

185 W at 55° C

160 W at 40° C

155 W at 25° C

SCBE2-MX Cooling Requirements

For proper cooling, you must install MX-series high-capacity fan trays in the MX chassis. Additionally, for the MX960, you must install a high-capacity filter tray.

SCBE2-MX Features

Feature

Description

Centralized Stratum 3 Clock Module

Provides a central clocking module and a centralized clocking architecture that supports clock cleanup and distribution. The Stratum 3 clock module performs clock monitoring, filtering, and holdover at a centralized chassis location.

External Clocking Interface (EXT CLK)

Allows BITS, GPS, or UTI clock source input to the centralized timing circuit. Also allows centralized timing to be output to BITS or GPS.

Cross-Coupling of Clocking Input

You can configure the system such that one SCBE2-MX supports a GPS clocking interface, and the other SCBE2-MX supports a BITS clocking interface. This requires an enhanced midplane:

  • MX960—CHAS-BP3-MX960-S

  • MX480—CHAS-BP3-MX480-S

  • MX240—CHAS-BP3-MX240-S

Improved Fabric Performance

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

Software Control Plane Features

Supports Dynamic Multicast Replication (DMR), Graceful Routing Engine Switchover (GRES), Non-Stop Routing (NSR), and Non-Stop Bridging (NSB) to ensure Routing Engine failures do not impact transit traffic while the backup Routing Engine becomes the new master.

Increased Bandwidth

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

In-system removable Routing Engine

The in-system Routing Engine can support any new Routing Engine that conforms to the standard modular Routing Engine I/O interface and form factor.

Note: When a Routing Engine is not installed in the SCBE2-MX, you need to cover the empty slot with a blank panel.

Hot-Swappable

The SCBE2-MX and associated Routing Engine assembly are hot-swappable and do not require downtime to replace. The system software provides a mechanism to shut down, or acquiesce the Routing Engine/SCBE2-MX. The system software also provides a method to reset or reboot the Routing Engine/SCBE2-MX. This support is provided via CLI commands, and various hardware support circuits.

Note: The Routing Engine must be brought offline prior to removal to avoid possible corruption of the hard drive.

Redundancy

With three SCBE2-MX’s installed, the MX960 router provides 2 + 1 redundancy. With two SCBE2-MX’s installed, the MX240 router and MX480 router provide 1 + 1 redundancy.

1000Base-T Ethernet Controller

Provides a 1 Gbps Ethernet link between the Routing Engines.

Hitless Operation

Allows you to upgrade programmable parts and reboot with “hitless” operation if the redundant SCBE2-MX’s are inserted in the system and are operational.

SCBE2-MX Components

Component

Description

OK/FAIL, FABRIC-ACTIVE, FABRIC-ONLY LEDs

Indicate the status of the SCBE2-MX. See SCBE2-MX LEDs.

XGE ports

Two Ethernet ports, labeled XGE, provide 10 GbE/1 GbE SFP+ interfaces. These ports also are connected to the Ethernet control switch which limits the traffic for the 10 GbE port and provides security to prevent unwanted access to the control plane via the external ports.

XGE port LEDs

Two LINK LEDs indicate the status of the XGE ports. See SCBE2-MX LEDs.

EXT CLKport

The RJ-45 external clock interface port, labeled EXT CLK, receives GPS and PPS timing from the GPS external interface.

EXT CLK port LEDs

Three LEDs labeled BITS, GPS, and UTI indicate the external clocking interface status. See SCBE2-MX LEDs.

SCBE2-MX LEDs

Table 1: SCBE2-MX LEDs

Label

Color

State

Description

FABRIC ACTIVE

Green

On steadily

Fabric is in active mode.

FABRIC ONLY

Green

On steadily

SCBE2-MX operates in fabric-only mode.

Off

SCBE2-MX operates in fabric or control-board mode.

OK/FAIL

Green

On steadily

SCBE2-MX is online.

Red

On steadily

SCBE2-MX has failed.

Off

SCBE2-MX is offline.

BITS

Green

On steadily

Building-integrated timing supply (BITS) clocking interface is active.

Red

On steadily

BITS clocking interface has failed.

Off

BITS clocking interface is offline.

GPS

Green

On steadily

Global positioning system (GPS) clocking interface is active.

Red

On steadily

GPS clocking interface has failed.

Off

GPS clocking interface is offline.

UTI

Green

On steadily

Universal Timing Interface (UTI) clocking interface is active.

Red

On steadily

UTI clocking interface has failed.

Off

UTI clocking interface is offline.

LINK

Green

On steadily

Port is enabled and link is established.

Off

Port is disabled or no link is established.

SCBE2-MX Fabric Planes and Redundancy

For the MX960:

  • Each SCBE2-MX provides two switch fabric planes for packet forwarding among the MPCs in the MX960.

  • The MX960 chassis may contain up to three SCBE2-MX's Therefore, six fabric planes are available.

  • Three SCBE2-MX’s are required for 2 + 1 redundancy.

  • In redundant fabric mode, four fabric planes from the first two SCBE2-MX’s will be in Active mode, and two fabric planes from the third SCBE2-MX will be in Spare mode.

  • In a non-redundant fabric mode, all six fabric planes will be in Active mode to increase fabric bandwidth.

For the MX240 and MX480 routers:

  • Each SCBE2-MX provides four switch fabric planes for packet forwarding among the MPCs in the MX480 and MX240 chassis.

  • The MX480 and MX240 routers contain a maximum of two SCBE2-MX’s. Therefore, eight logical planes are available.

  • Two SCBE2-MX’s are required for 1 + 1 redundancy.

  • In redundant fabric mode, four fabric planes from the first SCBE2-MX will be in Active mode, and four fabric planes from the second SCBE2-MX will be in Spare mode.

  • In a non-redundant fabric mode, all eight fabric planes will be in Active mode to provide increased fabric bandwidth.

  • Each fabric ASIC is configured in virtual plane mode, where two virtual planes exist on one fabric ASIC.

SCBE2-MX Slot Locations in the MX Chassis

For the MX960:

  • You can install up to three SCBE2-MX’s in the MX960 router chassis.

  • SCBE2-MX’s are installed vertically into the front of the MX960 chassis in the slots labeled 0, 1, and 2. If any slots are empty, you must install a blank panel.

  • The two SCBE2-MX’s residing in slot 6 and slot 7 of the MX960 chassis provide both control and switch fabric features, while the third SCBE2-MX residing in slot 8 of the chassis (hybrid slot) will only do fabric functions.

For the MX480 and MX240 routers:

  • You can install either one or two SCBE2-MX’s in the MX480 and MX240 router chassis.

    SCBE2-MX’s are installed horizontally into the front of the MX480 and MX240 chassis in the slots labeled 0 and 1. If any slots are empty, you must install a blank panel.

SCBE2-MX Interoperability with Existing Hardware

SCBE2-MX Operating Mode

MX240/480/960

Supported

Enhanced IP/Enhanced Ethernet Mode Only

DPC/MS-DPC

No

MS-MPC

Yes

MPC1

Yes

MPC2

Yes

MPC3

Yes

MPC4

Yes

MPC2-NG

Yes

MPC3E-NG

Yes

16x10GE MPC

Yes

MPC5

Yes

MPC6

No

MPC7 (480 Gbps)

Yes

MPC8 (960 Gbps)

No

MPC9 (1.6 Tbps)

No

Routing Engines

RE-S-1300(EOLed)

RE-S-2000 (EOLed)

RE-S-1800 (all variants)

RE-S-X6 (all variants)

yes

yes

yes

yes

Upgrading to the SCBE2-MX

Here’s the procedures for upgrading your MX960, MX480, or MX240 router to use the SCBE2-MX: