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.
Table 96 lists cables and transceivers that require the use of V400 alternative-configuration:
Table 96: 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.
Using the Extreme Stacking Tool
The Extreme Stacking Tool provides an easy way to plan your stack. As you select various switch
models and stacking methods, the tool shows you:
• What switch models can be stacked together and which cannot.
• Whether switching methods – for example, SummitStack-V and SummitStack-V80 (supported in
EXOS 30.1 and prior releases only) – are compatible with the selected switches.
• Statistics showing the routing options that are available with every stack combination.
• Recommendations about which switches should be the stack master and backup.
• Information about the supported versions of ExtremeXOS for every combination.
To use the Stacking Tool, follow these steps.
1. Open the Stacking Tool (https://stackingtool.extremenetworks.com/StackingTool/) in a web
browser.
Note
The Stacking Tool is also available in the Support Tools section of the Extreme Portal.
Building Stacks Using the Extreme Stacking Tool
ExtremeSwitching Hardware Installation Guide 211
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