Setting fabric speed

Use the following command to set the fabric speed for the 7750 SR-7/12/12e, 7450 ESS-7/12, 7750 SR-7s/14s, and 7950 XRS-20/20e. This command is associated with the FP3 or newer generation of switch fabric.
tools perform system set-fabric-speed

7750 SR-7/12/12e and 7450 ESS-7/12

The fabric-speed-a parameter enables the chassis to operate at the following speeds using N+1 switch fabric redundancy:

  • up to 100 Gb/s per slot for the 7450 ESS-7/12 and the 7750 SR-7/12

  • up to 200 Gb/s per slot for the 7750 SR-12e

This parameter is compatible with SFM5, which allows a mixture of FP2- and FP3-based cards to coexist. This fabric speed is displayed as "6 Gig" in the show>chassis output.

The fabric-speed-b parameter enables the chassis to operate at the following speeds using N+1 switch fabric redundancy:

  • up to 200 Gb/s per slot for the 7450 ESS-7/12 and the 7750 SR-7/12

  • up to 400 Gb/s per slot for the 7750 SR-12e

This parameter is compatible with SFM5. All cards in the system must be FP3-based. The system does not support any FP2-based cards when the chassis is set to fabric-speed-b. This fabric speed is displayed as "10 Gig" in the show>chassis output.

Note: To set fabric-speed-b for the 7750 SR-7/12 and 7450 ESS-7/12, the chassis must support 200 Gb/s per slot capability. To check if the chassis supports fabric-speed-b, execute the show>system>switch-fabric command and verify that the ‟chassis is 200G/slot capable” message is displayed.

The fabric-speed-c parameter enables the use of both FP3- and FP4-based cards and is compatible with SFM6. This speed is mandatory if FP4 cards are used. The performance of FP3 cards is the same as fabric-speed-b. This fabric speed is displayed as "S4" in the show>chassis output.

Note: To set fabric-speed-c for the 7750 SR-7/12/12e and 7450 ESS-7/12, the chassis must support S4 fabric capability. To check if the chassis supports fabric-speed-c, execute the show>system>switch-fabric command and verify that the ‟chassis is s4 fabric capable” message is displayed.

If no fabric speed has previously been set on the chassis, either fabric-speed-a or fabric-speed-b is automatically selected and set based on the physically equipped cards. If no FP2-based cards are physically equipped and the chassis meets the required capabilities, fabric-speed-b is selected; if not, fabric-speed-a is selected.

7950 XRS-20/20e

The none parameter enables the 7950 XRS-20/20e to use only FP3 cards. This fabric speed is compatible with the following SFMs: sfm-x20, sfm-x20-b, and sfm-x20s-b. When the none parameter is used, there is no fabric speed configured or displayed in the show>chassis output.

The fabric-speed-c parameter enables the use of both FP3- and FP4-based cards and is compatible with sfm2-x20s. For the 7950 XRS-20/20e, the performance of FP3 cards is the same as the none parameter. This fabric speed is displayed as "S4" in the show>chassis output.

If no fabric speed has previously been set on the chassis, the none parameter is set as the default.

The tools>perform>system>set-fabric-speed command is not used in 7950 XRS-40 systems.

7750 SR-7s/14s

The none command option enables the 7750 SR-7s/14s to use only FP4 cards. This fabric speed is compatible with sfm-s. When the none command option is used, there is no fabric speed displayed in the show chassisoutput.

The fabric-speed-d command option enables the use of both FP4- and FP5-based cards and is compatible with sfm2-s for the 7750 SR-7s and 7750 SR-14s. This speed is mandatory if FP5 cards are used. This fabric speed is displayed as "S5" in the show chassis output.

If no fabric speed has previously been set on the chassis, then the default is based on the specific chassis variant. For the FP4 chassis, the default is none; for the FP5 chassis the default is fabric-speed-d.