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This chapter describes the switch fabric used in the multishelf system. It includes these sections:
The switch fabric card described in this chapter uses a Class 1M laser. This caution and warnings apply to the switch fabric card.
Caution | Class 1M laser radiation when open. Do not view directly with optical instruments. |
Warning | For diverging beams, viewing the laser output with certain optical instruments within a distance of 100 mm may pose an eye hazard. For collimated beams, viewing the laser output with certain optical instruments designed for use at a distance may pose an eye hazard. Statement 282 |
Warning | Laser radiation. Do not view directly with optical instruments. Class 1M laser product. Statement 283 |
The multishelf system has eight fabric planes that support data traffic between the line cards. This figure shows a simplified view of the relationship between the line cards and fabric planes.
Each fabric plane is divided into three switching stages, which are numbered S1, S2, and S3. Data arrives at the S1 stage in an LCC, passes over the fabric cables to the S2 stage in a fabric card chassis (FCC), and then passes over the fabric cables again to the S3 stage in the destination LCC. This figure shows a simplified view of the relationship between the line cards and the fabric.
In each LCC, eight S13 fabric cards provide stages S1 and S3 for each of the eight fabric planes. All ingress traffic enters through the S1 component of the ingress S13 card, travels over the fabric cables and S2 fabric component, and exits through the S3 component on an S13 fabric card. Data traffic can enter through the S1 component of one card, pass through the S2 component, and then exit the S3 component of the same card.
The S2 cards are distributed between one, two, or four FCCs. The S2 cards for all fabric planes can be installed in a single FCC, but distributing the planes between FCCs prevents a failure in one FCC from disrupting traffic in all eight planes.
There are three types of switch fabric cards: CRS-FCC-SFC for 40G CRS-1 multishelf systems, CRS-FCC-SFC-140 for CRS-3 multishelf systems, and CRS-FCC-SFC-400 for CRS-X multishelf systems. They provide the same functionality. The only difference between the three cards is capacity.
The front view of a CRS-FCC-SFC switch fabric card that is installed in a 40G multishelf system is shown in the below figure. The 140G FCC switch fabric card (CRS-FCC-SFC-140) and 400G FCC switch fabric card (CRS-FCC-SFC-400) are similar.
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STATUS LED |
3 |
Handle |
2 |
Alphanumeric display |
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The front panel of the FCC SFC includes LED indicators that provide status and informational messages.