Changing ICX 7650 Stacking Speed

Be sure to connect stacking ports using optics that are compatible with the planned port speed. Be sure that the correct ports are connected. Be sure that speeds match on both ends of the stacking connection.

To change the rear-module stacking speed from 100 Gbps to 40 Gbps, enter the following commands on each affected unit.
```
device# configure terminal
device(config)# rear-module stack-40g
device(config)# write memory
device(config)# exit 
device# reload
```
The example sets ICX 7650 speeds on ports x/3/1 through x/3/4 to 40 Gbps and configures valid-stack-ports x/3/1 and x/3/3. The change takes effect when the reload command is used.

To remove the 40-Gbps stacking configuration and return the rear-module stacking speed to the default of 100 Gbps, enter the following commands on each affected unit.
```
device# configure terminal
device(config)# no rear-module stack-40g
device(config)# write memory
device(config)# exit
device# reload
```
The example configures ICX 7650 valid-stack-ports x/3/1 and x/3/2 for 100 Gbps. (Ports 3 and 4 are not used.) The change takes effect when the reload command is used.

Note: If 40-Gbps stacking trunks are configured, the configuration is removed.

Note: Different stacking ports are used for the two speeds. Be sure cables are connected correctly and correct optics are used before changing the stacking speed.

Stacking by Device

Changing ICX 7650 Stacking Speed