Alternative Configuration for Optics on X590, X690, and X870 Switches

To use certain fiber cables and optical transceivers for stacking on X590, X690, and X870 switches, you must use the alternative-configuration option on the configure stacking-support command. This option sets the stacking ports to 100 Gb, enables pre-emphasis, and enables error correction using IEEE 802.3bj Clause 91 RS-FEC.

Cables and Transceivers that Require Alternative Configuration lists cables and transceivers that require the use of alternative-configuration:
Table 1. Cables and Transceivers that Require Alternative Configuration

Part Number

Cable or Transceiver

10401

100Gb SR4 QSFP28 MMF transceiver

10403

100Gb LR4 QSFP28 transceiver

10404

100Gb CWDM4 QSFP28 SMF transceiver

10405

100Gb PSM4 QSFP28 SMF transceiver

10441

QSFP28 x 4SFP28 (4x25Gb) active optical breakout cable - 5 meters

10442

QSFP28 x 4SFP28 (4x25Gb) active optical breakout cable - 7 meters

10443

QSFP28 x 4SFP28 (4x25Gb) active optical breakout cable - 10 meters

10444

QSFP28 x 4SFP28 (4x25Gb) active optical breakout cable - 20 meters

For details about the configure stacking-support command, see the ExtremeXOS 30.7 Command Reference Guide .