ICX 7150 Stacking Trunks
All ports on both ends of a trunk must be configured at the same speed. The lead port in a stacking trunk must be a valid-stack-port. The default valid-stack-ports come up automatically as 10-Gbps ports (assuming they are licensed). Additional 10-Gbps ports require a license.
Stacking trunks can be configured as part of the stack interactive-setup process. Trunks can also be added when a link is down or on a production unit as described later in this section.
The following table lists ports that can be combined as stacking trunks. Refer to Configuring Two-unit Stack Linear-topology Trunks for more information on linear-topology trunks.