Displaying And Maintaining Service Loopback Groups; Configuration Example - 3Com S7906E Configuration Manual

The maximum total number of load-sharing aggregation groups and load-sharing service loopback
groups supported on an S7900E series Ethernet switch is 128. For more information about
aggregation groups, see Link Aggregation Configuration in the Access Volume.
You can change the service type of an existing service loopback group. For the change to be
successful, you must ensure that the service group has not been referenced; the attributes of all
member ports (if any) are not conflicting with the target service type; and no service loopback group
has been created for the target service type, because only one service loopback group is allowed
for a service type.
You can remove any service loopback group except the referenced ones.

Displaying and Maintaining Service Loopback Groups

To do...
Display information about the
specified service loopback
group or all service loopback
groups

Configuration Example

Network requirements
Ports of Device A support the tunnel service. Assign GigabitEthernet 2/0/1 through GigabitEthernet
2/0/3 to a service loopback group to increase bandwidth and achieve load sharing.
Configuration procedure
# Create service loopback group 1, and specify the service type as Tunnel (unicast tunnel service).
<DeviceA> system-view
[DeviceA] service-loopback group 1 type tunnel
# Disable MSTP on GigabitEthernet 2/0/1 through GigabitEthernet 2/0/3 and then assign them to
service loopback group 1.
[DeviceA] interface gigabitethernet 2/0/1
[DeviceA-GigabitEthernet2/0/1] undo stp enable
[DeviceA-GigabitEthernet2/0/1] port service-loopback group 1
[DeviceA-GigabitEthernet2/0/1] interface gigabitethernet 2/0/2
[DeviceA-GigabitEthernet2/0/2] undo stp enable
[DeviceA-GigabitEthernet2/0/2] port service-loopback group 1
[DeviceA-GigabitEthernet2/0/2] interface gigabitethernet 2/0/3
[DeviceA-GigabitEthernet2/0/3] undo stp enable
[DeviceA-GigabitEthernet2/0/3] port service-loopback group 1
[DeviceA-GigabitEthernet2/0/3] quit
# Create a logical interface Tunnel 1 and reference service loopback group 1 on Tunnel 1.
Use the command...
display service-loopback
group [ number ]
1-3
Remarks
Available in any view