Selects the switch ports and speed for stack communications.
| stack-ports | Specifies the stacking port range to be configured. Valid stacking port entries are 1, 2, 1-2, and all. |
| native | Selects the specified stacking port, which is the native, dedicated port that only supports stacking. |
| V40 | Specifies that the native stacking port can operate at 10 Gbps. |
| V80 | Specifies that the native stacking port can operate at 20 Gbps. |
| V160 | Specifies that the native stacking ports operate at 160 Gbps. |
| V320 | Specifies that the native stacking ports operate at 320 Gbps. |
| V400 | Specifies that the native stacking ports on the option card operate at 400 Gbps (ExtremeSwitching X590, X690, and X870 only). |
| alternative-configuration | Selects the V400 alternate configuration stacking mode. |
| help | Provides more details regarding the alternate configuration stacking mode |
| alternate | Selects the alternate (Ethernet) stacking port associated with the specified stacking port. The alternate port numbers are listed in the following table. |
Switches with native stack ports default to "Native".
Each speed configuration requires a specific cabling configuration. For more information, see the ExtremeSwitching and Summit Switches: Hardware Installation Guide for Switches Using ExtremeXOS Version 31.5 .
The stacking-support option configures the switch to use stacking protocols. This option is automatically enabled on most platforms, but some platforms require you to manually enable the stacking-support option. The following table lists the ExtremeSwitching series switches and option card configurations that support Stacking Port Selection Control, and it lists which platforms require manual Stacking-Support Option Control.
| Switch Model Number | Switch Option Card | Alternate Port for Stack Port | Alternate Port for Stack Port | Stacking-Support Option Control | Stacking Port Selection Control |
|---|---|---|---|---|---|
| X440-G2-12t-10GE4 X440-G2-12p-10GE4 |
None | 15 | 16 | Yes | Yes |
| X440-G2-24t-10GE4 X440-G2-24x-10GE4 X440-G2-24t-10GE4-DC X440-G2-24p-10GE4 |
None | 27 | 28 | Yes | Yes |
| X440-G2-48t-10GE4 X440-G2-48t-10GE4-DC X440-G2-48p-10GE4 |
None | 49 | 50 | Yes | Yes |
| X450-G2-24t-10GE4 X450-G2-24p-10GE4 X450-G2-48t-10GE4 X450-G2-48p-10GE4 |
None | 27 27 51 51 |
28 28 52 52 |
No | Yes |
| X460-G2-24t-1G X460-G2-24p-1G X460-G2-48t-1G X460-G2-48p-1G |
VIM-2X | 33 33 53 53 |
34 34 54 54 |
Yes | Yes |
| X460-G2-24p-10G X460-G2-24t-10G X460-G2-24x-10G X460-G2-48p-10G X460-G2-48t-10G X460-G2-48x-10G X460-G2-24p-24hp-10GE4 X460-G2-24t-24ht-10GE4 X460-G2-16mp-32p-10GE4 |
None | 31 31 31 51 51 51 51 51 51 |
32 32 32 52 52 52 52 52 52 |
Yes | Yes |
| X620-8t-2x X620-10x |
None | 9 | 10 | Yes | Yes |
| X620-16t X620-16x X620-16p |
None | 15 | 16 | Yes | Yes |
| X670-G2-48x-4q | None | 47 | 48 | Yes | Yes |
| X670-G2-72x | None | 71 | 72 | Yes | Yes |
|
5520-24T 5520-24W 5520-24X |
5520-VIM-4X | 35 | 36 | Yes | Yes |
|
5520-48T 5520-48W 5520-12MW-36W 5520-48SE |
5520-VIM-4X | 59 | 60 | Yes | Yes |
When the alternate stack port is selected for a native stack port and the switch is restarted, the native stack port remains visible in the CLI and can be configured. However, any configuration applied to the replaced stack port is ignored and does not affect switch operation.
An alternate stack port runs the stacking protocol and cannot operate on a link connected to a data port that is not configured as a stack port. Both ends of a stack link must be configured to use the stacking protocol. The stacking link must be directly connected to two the alternate stacking ports of two stacking switches. The direct connection is necessary because stacking protocols cannot pass through an intermediate switch.
After a data port is reconfigured as an alternate stack port, all data port configuration commands still work, but they do not change the operation of the alternate stack port. The LEDs on an Ethernet port used as an alternate stacking port operate according to the behavior of the Ethernet port. The LEDs on the related (disabled) native stacking port remain dark.
Note
Commands that contain the stacking-support keyword operate only on the local switch; they do not apply to all switches in the stack. If an active stack topology has been formed, you can telnet to a slot elsewhere in the stack, log on to that switch, and use commands with the stacking-support keyword on that switch.
The following command configures the switch to use the alternate stack port for Stack Port 1 after the next switch restart:
configure stacking-support stack-ports 1 selection alternate
The following command configures the switch to use both native stacking ports after the next switch restart:
configure stacking-support stack-ports all selection native
The following command configures stack ports 1 and 2 to operate as four 40 Gbps ports:
configure stacking-support stack-ports all selection native V160
This command was first available in ExtremeXOS 12.5.
The V160 keyword was added in ExtremeXOS 12.6.
The V320 keyword was added in ExtremeXOS 15.1 Revision 2.
The V400 keyword was added in ExtremeXOS 22.2.
The alternative-configuration and help keywords were added in ExtremeXOS 31.5.
The V40 keyword was added in ExtremeXOS 31.3
The V80 keyword was added in ExtremeXOS 31.4.
This command is available on X450-G2, X460-G2, X670-G2, X440-G2, X590, X620, X690, X695, X870, 5420, and 5520 series switches.