Alternative Configuration for Optics on X590, X690, X695, and X870 Switches

To use certain fiber cables and optical transceivers for stacking on X590, X690, X695, and X870 switches, you must use the V400 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 V400 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 16.2 Command Reference Guide .