The allowed link speeds configuration for each interface group of a subsystem. Interface groups are blocks of ports for which only a subset of link speeds are usable at the same time due to hardware limitations. For example, a group of ports might support 10 Gbps and 25 Gbps transceivers, but not at the same time. When configured for 25g, any ports in the group with a 10 Gbps transceiver inserted cannot link. Groups are configured with a name describing a subset of link speeds. The speeds allowed by each name are defined by interface_group_info. Groups with no configuration default to the name defined in interface_group_default_speed. The currently applied name is available in interface_group_applied_speed. Note that not all defined group and speed names are available on all subsystems. Only groups and speeds listed in interface_group_info are used on a given subsystem. Any configured groups not listed are not used by the subsystem and are ignored. Groups configured with a speed setting that is not valid for the subsystem use the default instead.
