CHAPTER 8
Switch Fabric Components and
Descriptions
•
T640 Switch Interface Boards (SIBs) Description on page 111
T640 Switch Interface Boards (SIBs) Description
The Switch Interface Boards (SIBs) provide the switching function to the destination
FPC (see Figure 49 on page 112).
The SIBs create the switch fabric for the router, providing up to a total of 640 million
packets per second (Mpps) of forwarding. Five SIBs are installed in the router. The SIBs
are located at the center rear of the chassis in the slots labeled SIB0 through SIB4 (top
to bottom).
SIBs are hot-insertable and hot-removable.
One of the five SIBs—usually SIB4—acts as a backup to the remaining four SIBs. If a SIB
fails, the backup SIB becomes active and traffic forwarding continues without any
degradation. When the failed SIB is replaced, it becomes the new backup.
Each SIB consists of the following components:
•
Switch Fabric ASICs.
•
High-speed links (HSLs) to each FPC. See Table 63 on page 111.
•
Three LEDs—ACTIVE, OK, and FAIL—located on the SIB faceplate that display the
status of the SIB. T640 Switch Interface Boards (SIBs) LEDs describes the functions of
the SIB LEDs.
•
SIB online/offline button, located on the SIB faceplate.
Each T640-SIB also has a fiber-optic adapter for connection to a TX Matrix router. See
the TX Matrix Router Hardware Guide.
Table 63: Links to the SIBs From the FPCs
Links to SIBsFPC Type
Each FPC has one dedicated ASIC with five high-speed links that
connect to the SIBs (one link per SIB)
Type 1 FPC
111Copyright © 2017, Juniper Networks, Inc.
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