Scbe3-Mx Fabric Bandwidth Performance And Redundancy - Juniper MX960 Hardware Manual

Component/Feature
Removable Routing Engine
Module

SCBE3-MX Fabric Bandwidth Performance and Redundancy

MX960 Routers
The MX960 system may contain up to three SCBE3-MX's to provide a total of six switch fabric planes
for packet forwarding among the MPCs. Two fabric planes per SCBE3-MX's are required. To achieve
full fabric bandwidth performance, three SCBE3-MX's must be installed in the MX960 chassis.
Two chassis slots are provided in the center of the MX960 chassis in slots 6 and 7 (also designated as
slot SCB 0 and slot SCB 1) for two SCBE3-MXs, each equipped with a Routing Engine.
To provide 2 + 1 fabric redundancy for an MX960, a third SCBE3-MX must be installed in slot 8 (also
designated as slot SCB 2).
Slot 8 in the MX960 chassis is a dual-purpose slot, and supports either an SCBE3-MX or an MPC. When
the SCBE3-MX/Routing Engine are plugged into slot 8, the Routing Engine is powered down and does
not provide any control functionality for the board or the MX960. The fabric-only LED on the card
faceplate will be lit when an SCBE3-MX/Routing Engine assembly is plugged into slot 8.
Once redundancy is configured, the master SCBE3-MX controls the chassis.
Graceful upgrades can be achieved on a non-master redundant SCBE3-MX.
In a redundant configuration, the non-master redundant Routing Engine can be removed or installed
without affecting the switching plane functionality on the SCBE3-MX in which it resides.
In a non-redundant configuration, all six fabric planes will be in Active mode for increased fabric
bandwidth.
There is one ZF-based switch fabric per SCBE3-MX and it acts as two virtual planes in MX960.
MX480 and MX240 Routers
You can install either one or two SCBE3-MX's in the MX480 and MX240 router chassis in the slots
labeled 0 and 1.
The SCBE3-MX in slot 0 (SCB 0) provides two fabric planes; the SCBE3-MX in slot 1 (SCB 1) provides
four fabric planes. A total of six fabric planes are available in the MX240 and MX480 routers.
In redundant configuration, two fabric planes on the first SCBE3-MX and two fabric planes on the other
SCBE3-MX will be in Active mode.
There is one ZF-based switch fabric per SCBE3-MX and it acts as four virtual planes in the MX480 and
MX240.
Description
You can remove the Routing Engine module FRU in the existing form factor.
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