H3C Technologies H3C WX5500E Series Access Controllers - Manual (Page 199)

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Configuring service loopback groups
This chapter describes how to configure service loopback groups.
Overview
A service loopback group contains one or multiple Ethernet ports for looping packets sent out by the
device back to the device. This feature must work with other features, such as GRE. Member ports in a
service loopback group are load balanced.
Service types of service loopback groups
A service loopback group provides one of the following services:
• Tunnel—Supports unicast tunnel traffic.
• Multicast tunnel—Supports multicast tunnel traffic.
The device supports only one service loopback group for each service type. However, you can use one
service loopback group with multiple features.
States of service loopback ports
A service loopback group member port is placed in one of the following states:
• Selected—A selected port can loop back user traffic.
• Unselected—An unselected port cannot loop back user traffic.
The system sets the state of each member port in a service loopback group to selected or unselected by
using the following workflow.
1. Selects 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 is selected.
2. Sets the state of each member port in the service loopback group, as shown in Figure 58 .