H3C Technologies H3C S10500 Series Switches - Manual (Page 246)

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Service loopback group configuration
Overview
To increase traffic redirecting throughput, you can bundle multiple Ethernet ports of a device together to
increase bandwidth and implement load sharing. These ports that act as a logical link form a service
loopback group. A service loopback group must contain at least one Ethernet port as its member port,
called a service loopback port.
For example, by assigning three Ethernet ports of the same device to a service loopback group, you can
create a logical link whose bandwidth can be as high as the total bandwidth of these three ports. In
addition, service traffic is load balanced among these ports.
Service types of service loopback groups
A service loopback group is applicable to a specified service type. The service types supported by the
service loopback group are:
• Tunnel, which supports unicast tunnel traffic
• Multicast tunnel, which supports multicast tunnel traffic
Requirements on service loopback ports
Before you assign a port to a service loopback group, ensure the following:
• The port supports the services type or types of the service loopback group.
• The port is not configured with multiple spanning tree protocol (MSTP), Link Layer Discovery
Protocol (LLDP), 802.1X, MAC address authentication, port security mode, or IP source guard, or as
the member port of an isolation group.
• The link type of the port is access.
• The port is not a member of any Ethernet link aggregation group or service loopback group.
States of service loopback ports
States of service loopback ports
A member port in a service loopback group is a service loopback port, which can be in either of the
following states:
• Selected: A selected port can loop back user traffic.
• Unselected: An unselected port cannot loop back user traffic.
The number of selected ports is limited in a service loopback group.
Setting the state of service loopback ports
The system sets the state of each member port in a service loopback group to selected or unselected by
using the following workflow.
1. Select the full-duplex port with the highest rate as the reference port. If two ports have the same
duplex mode and speed, the one with the lower port number wins.