Summit X770 Stacking

The stacking-support option is enabled by default for X770 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 X770 switches. For more information, see Selecting Native and Alternate Stacking Ports.

Table 1. Stacking Methods for X770 Switches
Stacking Method	Speed per Link (HDX)	Cable Type and Lengths
SummitStack-V (ports 103 and 104)	10 Gbps	1m and 2m QSFP+ 4xSFP+ fan-out cable
SummitStack-V160 (ports 103 and 104)	40 Gbps	0.5m, 1m, and 3m (26 AWG) QSFP+
SummitStack-V320 (ports 101 and 103, and 102 and 104)	80 Gbps (combined over paired ports)	0.5m, 1m, and 3m (26 AWG) QSFP+

Native Stacking for X770 Switches

The X770 supports SummitStack-V80, V160, and V320 stacking. Use any Extreme Networks certified 40G QSFP+ cable or optical transceiver to make the connections among the switches to be stacked.

For X770 native stacking, use the fixed 40G QSFP+ ports numbered 101, 102, 103, and 104 (shown in Location of Stacking Ports (101 through 104) on an X770 Switch).

For a complete listing of compatible cables and optical transceivers, see the Extreme Optics Compatibility website.

Alternate Stacking for X770 Switches

Alternate Stacking Ports for X770 Switches summarizes alternate stacking support for X770 switches.

Table 2. Alternate Stacking Ports for X770 Switches
Switch Model	Type or location of Native Stacking Ports	Alternate Stacking Ports	Location of Alternate Stacking Ports
X770-32q	Ports 101,102,103,104	103,104	Front panel

Note

Ports 103 and 104 are not available as data ports when the alternate stacking ports are used. Ports 101 and 102 remain available to use as data ports.

Additional Stacking Considerations for X770 Switches

Before deploying a new stack with Summit X770 switches, consider the following guidelines:

To use the failover feature in the stack, a second Summit X770 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 (Multiprotocol Label Switching).
If the MPLS feature pack is installed on the master-capable nodes, the following guidelines apply:
- Enhanced stacking must be configured on each switch in the stack. (In ExtremeXOS version 22.2 and later, enhanced stacking is configured automatically.)
- We recommend against mixing X450-G2, X460-G2, X670-G2, and X770 switches in a stack if the desired routing table exceeds the supported limit. For the X770 switch, the limit is 98K IPv4 LPM routes.
X770 switches support multiple types of QSFP+ stacking cables for connection between ports 101-104 and other Summit switches. For information on which cables to use with each type of switch, see Selecting Stacking Cables.