States Of The Ports In A Service Loopback Group; Configuring A Service Loopback Group - 3Com S7906E Configuration Manual

The port is not configured with MSTP, the member port of an isolation group, 802.1X, MAC address
authentication, port security mode, or IP source guard. Additionally, the member port of a service
loopback group cannot be configured with any of the above-mentioned configurations.
The port belongs to VLAN 1.
The port is not a member of any aggregation group or service loopback group.

States of the Ports in a Service Loopback Group

A member port in a service loopback group can be in one of the following two states:
Selected: a selected port can forward user traffic.
Unselected: an unselected port cannot forward user traffic.
The system sets the state of each port in a service loopback group to selected or unselected as follows:
Select the full-duplex port with the highest rate as the reference port. If two ports with the same
duplex mode/speed pair are present, the one with the lower port number wins out.
Consider the ports the same as the reference port in rate, duplex mode, and hardware restrictions
as candidate selected ports, and set the rest ports to unselected state.
The number of selected ports is limited in a service loopback group. If the number of candidate
ports exceeds the limit, those with smaller port IDs are set to selected state and the others are set
to unselected state.
The system follows the preemption principle when setting port state in a service loopback group. If the
port you are assigning to a service loopback group can be set to selected state, the system will do that,
even if this can cause an existing selected port to transit to unselected.

Configuring a Service Loopback Group

Follow these steps to configure a service loopback group:
To do...
Enter system view
Create a service loopback
group
Enter Layer-2 Ethernet
interface view
Assign the Ethernet
interface to the specified
service loopback group
Use the command...
system-view
service-loopback group number
type { multicast-tunnel | tunnel } *
interface interface-type
interface-number
port service-loopback group
number
1-2
Remarks
—
Required
Required
By default, a port does not
belong to any service
loopback group
Repeat the two steps to
assign multiple Ethernet
interfaces to the service
loopback group.