X670-G2 Stacking

The stacking-support option is enabled by default for X670-G2 switches. For more information, see Enabling and Disabling the Stacking-Support Option.

The stacking port selection option, which allows you to choose between native and alternate ports, is enabled by default for X670-G2 switches. For more information, see Selecting Native and Alternate Stacking Ports.

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Stacking Methods for X670-G2 Switches

Stacking Method Speed per Link (HDX) Cable Type and Lengths

all X670-G2 switch models

10 Gbps SFP+ to SFP+
SummitStack-V80 (supported in EXOS 30.1 and prior releases only)

model 48x-4q only

20 Gbps QSFP+ to QSFP+

model 48x-4q only

40 Gbps QSFP+ to QSFP+

model 48x-4q only

80 Gbps QSFP+ to QSFP+

Native Stacking for X670-G2 Switches

For X670-G2 native stacking, use the 4 x 40 Gb interfaces that are fixed on the front of the switch. Use any Extreme Networks certified 40G QSFP+ cable or optical transceiver to make the connections among the switches to be stacked.

For a complete listing of compatible cables and optical transceivers, see the Extreme Hardware/Software Compatibility and Recommendation Matrices.

X670-G2-48x-4q switches support native stacking using V160 and V320.
  • For SummitStack-V160 stacking, use ports 57 and 61.
  • For SummitStack-V320 stacking, use ports 49, 53, 57, and 61.

X670-G2-72x switches support do not support native stacking.

Alternate Stacking for X670-G2 Switches

Alternate Stacking Ports for X670-G2 Switches summarizes alternate stacking support for X670-G2 switches.

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Alternate Stacking Ports for X670-G2 Switches

Switch Model Type or location of Native Stacking Ports Alternate Stacking Ports Location of Alternate Stacking Ports
X670-G2-48x-4q Ports 49,53,57,61 47,48 Front panel
X670-G2-72x None 71,72 Front panel


  • On X670-G2-48x-4q switches, ports 47 and 48 are not available as data ports when the alternate stacking ports are used.
  • On X670-G2-72x switches, ports 71 and 72 are not available as data ports when the alternate stacking ports are used.

Additional Stacking Considerations for X670-G2 Switches

Before deploying a new stack with X670-G2 switches, consider the following guidelines:

  • In a stack that contains X670-G2 switches and other switch models, the X670-G2 switch might provide more memory and more features than the other switch models. Take this into account when you decide which switches will serve as the master and backup nodes, and when you configure failover operation.
  • To use the failover feature in the stack, a second X670-G2 switch is recommended. It must be the backup node.
  • Only the master and master-capable nodes require a license to support special features such as MPLS.
  • If the MPLS feature pack is installed on the master-capable nodes, the following guidelines apply:
    • Every switch in the stack must meet the software and hardware requirements listed in the Feature License Requirements document.
    • Every node that shares a stack with an X450-G2 switch must have enhanced stacking configured.
    • We recommend against mixing X450-G2, X460-G2, X770, and X670-G2 switches in a stack.
    • The X670-G2-48x-4q switch supports the LR4 Parallel Single Mode (PSM) optical transceiver on 40G optical QSFP+ ports.

1 Combined over paired ports