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The High Speed Stacking feature allows you to configure a homogenous stack of switches to run at the speed of 1Tbps.
A high speed stack can support a maximum of 16 ASICs. The maximum switches on a stack in the high speed mode depend on the sum of total number of ASICs on the stack ring.
This feature is supported only on the C9300X-12Y, C9300X-24Y, C9300X-48HX and C9300X-48TX models of the Cisco Catalyst 9300 Series Switches.
High Speed Stacking allows you to configure the bandwidth of Standard Interchange Format (SIF) ports to 1 Tbps.
The following topics provide information about High Speed Stacking.
High Speed Stacking allows you to configure the bandwidth of the SIF ports on a stack to 1Tbps. High Speed stacking is applicable only when all the switches in a stack are Catalyst 9300X switches.
You can use the configuration command switch stack-speed[ high| low] to configure the bandwidth of the SIF ports from 480Gbps (legacy mode) to 1Tbps (high speed mode). You need to reload the stack after the command is issued.
When a stack consisting of Catalyst 9300X switches boots up, a script will detect that the stack is capable of high speed. It will trigger a second reboot and change the configuration of all the switches to high speed. The script works only when all the switches have the manufacture default configuration.
The SIF port speed in the manufacture default configuration is 480 Gbps. Two stack ports on the same switch must have the same SIF port speed. If a stack cable connects to two stack ports with mismatched speeds the port link will go down. The stack will be split into sub-rings. To correct the stack-split situation, you can configure each sub-stack with the same speed by using the switch stack-speed[ high| low] command.
When a stack boots up in the manufacture default configuration, it always boots up with the lowest speed among members. If the stack is homogenous and consists of only Catalyst 9300X switches capable of High Speed Stacking, a script running on the active switch determines that all the switches are capable of high speed. The active switch configures the stack to high speed and initiates a second round of reloads. After the second reload all the members of the stack load with high speed configured. The stack becomes a high speed ring. The homogenous stack of Catalyst 9300X switches must be a full ring stack for the automatic script to work. The script will work automatically within the first 15 minutes of uptime only.
You can use the command show switch stack-ring speed to display the current speed of the stack ring and what the speed will be after the next reboot.
You can use the command show switch stack-bandwidth to display the current stack bandwidth and what the bandwidth will be after the next reboot.
The following scenarios detail how to manage the insertion of a new switch into a high speed stack.
Insertion of a Cisco Catalyst 9300X switch into a high speed stack: The new switch that is to be inserted into the stack must be powered off. After connecting the switch to the stack cables it can be powered on again. If the new switch has been configured for high speed it will join the stack in high speed. If the switch has not been configured for high speed it will boot up as an active island. You will have to connect to the switch using a console or telnet. Enter the configuration command switch stack-speed high . After entering the command the following notice will be displayed: “Stack speed does not take effect until after the reboot.”After the second reboot the switch will match the speed of the stack.
Insertion of a Cisco Catalyst 9300 switch into a high speed stack: All Cisco Catalyst 9300 switches are not capable of High Speed Stacking. The switch will become an active island in the high speed autonomous stack. If you intend to have a mixed stack running at legacy speed (480 Gbps), you should configure the command switch stack-speed low on the high speed homongenous stack. Once you reload the stack and the new switch you will have a mixed stack operating at low speed.
Insertion of a Cisco Catalyst 9300X switch into a mixed stack: A new switch capable of High Speed Stacking is configured for low speed by default. If a Catalyst 9300X switch is not configured to the manufacturing default configuration you can use the switch stack-speed low command to change its speed to legacy speed (480 Gbps) to match the stack. Mixed stacking can function only at low speed (480 Gbps). The new switch will join the mixed stack and function at low speed.
You can use the following methods to configure a switch to the desired speed setting.
Cisco Zero Day Deployment: You can apply the startup configuration with the desired speed setting on a stand-alone switch using Cisco Zero Day Deplyment.
CLI: You can connect the stand-alone switch to a console and enter the configuration command switch stack-speed [high | low] . You can configure the desired speed and reload the switch. After the reload you can insert the switch into the stack.
Configuration Auto-install: You can auto-configure a stand-alone switch by connecting it to a TFTP server reachable by management Gigabit Ethernet port. You can also use a USB key to auto-configure the switch in standalone mode.
To configure High Speed Stacking, perform this procedure.
| Command or Action | Purpose | |
|---|---|---|
|
Step 1 |
enable Example: |
Enables privileged EXEC mode. Enter your password if prompted. |
|
Step 2 |
configure terminal Example: |
Enters global configuration mode. |
|
Step 3 |
switch stack-speed [ high| low] Example: |
Configures the stack speed to high (1Tbps) or low (480Gbps). The configuration requires a reload to take effect. |
|
Step 4 |
end Example: |
Returns to privileged EXEC mode. |
|
Step 5 |
show switch stack-ring speed Example: |
Displays the current stack ring speed and the stack ring speed after the next reload. |
|
Step 6 |
show switch stack-bandwidth |
|
The following sections provide examples of High Speed Stacking configurations.
The following example shows how to display the switch stack-ring speed
Device#show switch stack-ring speed
Stack Ring Speed : 1000G
Stack Ring Configuration: Full
Stack Ring Protocol : StackWise
Stack Ring Next-boot Speed: 1000G.
The following example shows how to display the switch stack bandwidth.
Device#sh switch stack-bandwidth
Stack Current Next-boot
Switch# Role Bandwidth State Bandwidth
------------------------------------------------------------
*1 Active 480G Ready 1000G
2 Standby 480G Ready 1000G
3 Member 480G Ready 1000G
This table provides release and related information for the features explained in this module.
These features are available in all the releases subsequent to the one they were introduced in, unless noted otherwise.
|
Release |
Feature |
Feature Information |
|---|---|---|
| Cisco IOS XE Bengaluru 17.5.1 |
Configuring High Speed Stacking |
The High Speed Stacking feature allows you to configure a homogenous stack of switches to run at the speed of 1Tbps. The feature was introduced on the C9300X-12Y and C9300X-24Y models of the Cisco Catalyst 9300 Series Switches. |
|
Cisco IOS XE Bengaluru 17.6.2 |
Configuring High Speed Stacking |
The feature was introduced on the C9300X-48HX and C9300X-48TX models of the Cisco Catalyst 9300 Series Switches. |
Use Cisco Feature Navigator to find information about platform and software image support. To access Cisco Feature Navigator, go to https://cfnng.cisco.com.
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