Guidelines - Allied Telesis AT-8100L/8 User Manual

Chapter 31: Group Link Control

Guidelines

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Here are the guidelines to group link control:
 The switch or stack can support up to eight groups.
 A group can have any number of ports, up to the total number of
ports on the switch.

Ports can be members of more than one group. Ports can also be
upstream and downstream ports in different groups. Ports,
however, cannot be both upstream and downstream ports in the
same group.

When creating a new group, add the upstream ports before the
downstream ports. Otherwise, the switch will disable the
downstream ports.

Group link control passes the link states of the upstream ports to
the downstream ports, but not the reverse. Changes to the states
of the downstream ports are not transferred to the upstream ports.

A group is active as soon as you create it.

The downstream ports of a new group immediately stop forwarding
traffic if the upstream ports do not have links.
 When a downstream port is disabled by group link control, it
remains in that state until the upstream port of the group
establishes a link to a network device or you remove the
downstream port from the group, or delete the group, and issue the
NO SHUTDOWN command on the port. For instructions, refer to
"Enabling or Disabling Ports" on page 182 or "NO GROUP-LINK-
CONTROL" on page 524.

You cannot prioritize the groups on the switch.