The ETHA, ETHB, and GIU Boards

Hi, dear friend.

The ETHA board supports only intra-board aggregation groups and protect groups, but does not support inter-board aggregation groups or protect groups. In addition, the ETHA board can be used for cascading but not for upstream transmission.

The ETHB and GIU boards support both intra-board aggregation groups and protect groups, and inter-board aggregation groups and protect groups. Inter-board aggregation groups and protect groups can be set up only between the ports on the boards of the same type. For example, a port on the ETHB board and a port on the GIU board cannot form an inter-board aggregation group.

When setting up an aggregation group or protect group, pay attention to the following points:

• A port can be directly added to a protect group. Or, it can be added to an aggregation group and then to a protect group. A port that has been added to a protect group, however, cannot be added to an aggregation group.

• Switching is of low efficiency between the ports that are in a protect group only, but switching is highly efficient between the ports that are both in an aggregation group and in a protect group. In this case, it is recommended that you add ports to an aggregation group and then to a protect group. This shortens service interruption.

Thanks.