Cisco Fabric MIB module for c12000 series of routers.
This MIB module is used for managing/tracking the c12000
fabric entities and fabric related configuration, status
and statistics information.
C12000 fabric architecture is based on NxN non-blocking
crossbar switch fabric, where N stands for the maximum
number of LCs that can be supported in the chassis (this
includes the RP). The connections through the switch
fabric is controlled by a scheduler (CSC), the CSC
accepts transmission requests from line cards, issues
grants to access the fabric, and provides a reference
clock to all the cards in the system to synchronize data
transfer across the crossbar.
Some of the error status objects in the MIB are read-clear,
that is the value of the object is cleared on a query of the
Details about the various fabric related attributes
specified in the MIB could be found at following link,
Acronyms and terms used in the MIB module:
GSR - Gigabit Switch Router.
RP - Route Processor.
LC - Line Card.
SFC - Switch Fabric Card.
CRC - Cyclic Redundancy Check.
CSC - Clock Scheduler Card.
CiscoCell - The unit of data that is exchanged
between line cards through the switch
FIA - Fabric Interface Asic, this Asic
resides on the line card and is
used to interface line card and
ToFabFIA - Represents the ToFabric FIA, FIA
which transmits data from the
line card to the fabric.
FrFabFIA - Represents the From Fabric FIA, FIA
which receives data from the fabric.
SCA - Scheduler Control Asic, this Asic
resides on each CSC and is used to
arbitrate among the line card
requests to transmit CiscoCells
through the switch fabric.
Xbar - Crossbar Switch Asic, this Asic
resides on each fabric card and provides
the functionality of a crossbar
SLI - Serial Link interface block, this
block resides on the FIA on the line
cards and the Xbar and SCA on the
switch fabric. The functionality of SLI
is to interface the linecards and fabric
BMA - Buffer Manager Asic, this Asic is
located on a Pre OC-192 linecard.
It provides the packet buffering
and buffer queue management.
MCC - Memory Communication Controller Asic,
this Asic is located on a OC-192
linecard and is an enhanced packet buffer
Asic. MCC captures the data and control
path information for packets destined
to all line cards in the system. On the
receive side MCC interfaces with the
Rx Asic where the packets are looked up
and sent to the MCC for buffering. On the
transmit side it interfaces with the
ToFabFIA where packets arrived from MCC
will be segmented into CiscoCells before
being sent across the fabric.
CSAR - Cisco Cell Segmentation And Reassembly,
The name of an FPGA used on the RP which
handles traffic between the processor
and switch fabric.
Request - A signal sent by a FIA (on a line card)
to the SCA (on Master CSC) requesting a
switch connection to a output linecard as an
intent to transmit CiscoCells across.
Grant - A signal sent by the SCA to a FIA (on a
line card) granting a switch connection which
was requested by the FIA.
SRAM - Static Random Access Memory.
LOS - Loss Of Signal.
FPGA - Field Programmable Gate Array.