configure stacking-support stack-ports

configure stacking-support stack-port [stack-ports | all] selection [native {V40 | V80 | V160 | V200 | V320 | V400 {alternative-configuration | help}} | alternate]

Description

Selects the switch ports and speed for stack communications.

Syntax Description

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 40 Gbps.
V200 Specifies that the native stacking ports operate at 50 Gbps
V320 Specifies that the native stacking ports operate at 80 Gbps.
V400 Specifies that the native stacking ports on the option card operate at 100 Gbps (Not available on Universal platforms).
alternative-configuration Selects the V400 alternate configuration stacking mode for (ExtremeSwitchin 5720 series switches).
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.

Default

Switches with native stack ports default to "Native".

Usage Guidelines

The configuration entered with this command applies to only the local node and does not become active until after the following events:
  • The stacking-support option is enabled (if applicable).
  • The switch restarts.

Each speed configuration requires a specific cabling configuration. For more information, see Hardware Installation Guide for your switch model.

"V400" is the default mode that sets the stack ports to 106G. "V400 alternative-configuration" is required when using specific fiber cables. This mode sets the stack ports to 100G, enables pre-emphasis, and FEC (clause_91). Cables requiring alternative-configuration include:
  • QSFP28 SR4
  • QSFP28 LR4
  • QSFP28 CWDM4
  • QSFP28 PSM4
  • QxQ AOC cable - 5m
  • QxQ AOC cable - 7m
  • QxQ AOC cable - 10m
  • QxQ AOC cable - 20m
For a complete list of supported cables, see Extreme Optics Compatibility.

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.

Table 1. ExtremeSwitching Series Switch Support for Alternate Stack Ports
Switch Model Number Switch Option Card Alternate Port for Stack Port Alternate Port for Stack Port Stacking-Support Option Control Stacking Port Selection Control

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

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.

Example

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

History

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 33.1.1.

The V40 keyword was added in ExtremeXOS 31.3

The V80 keyword was added in ExtremeXOS 31.4.

The V200 keyword was added in ExtremeXOS 31.6.

Platform Availability

This command is available on all Universal switches supported in this document.