POE+ SERIES SWITCHES LOOPBACK DETECTION CONFIGURATION GUIDE
1. Loopback Detection Configuration
1.1 Introduction to Loopback Detection
Loopback in the network may cause the equipment repeatedly forward the broadcast, multicast and unknown unicast, resulting in
the waste of network resources or the network breakdown. In order to timely inform the user the conditions of the network
connection and configuration, a detection mechanism is necessary. So, there is the Loopback Detection. It can detect if there is a
loopback in the port of the equipment, i.e. forward packets from the port regularly and detect whether the packets are sent back
from the forwarding port. If there is a loopback in the port, Loopback Detection will forward the warning information timely to the
network management system. Thus, the equipment can avoid long-time off-line. Besides, the equipment supports three modes of
port controls: block, no MAC learning, and shutdown (error-disable).
The OLT supports:
the loopback detection of the port;
the destination MAC address of the loopback detection packet; the loopback detection packet forwarded by each port can
be configured;
the loopback detection for certain VLANs (at most 10);
the loopback-detection hello-time and loopback-detection recovery-time;
three modes of port controls: block, no MAC learning, and shutdown (error-disable);
loopback detection existence configuration.
1.1.1 Format of Loopback Detection Packet
0x0180C2B0000A (Default, can be
configured)
MAC address of OLT system
The concrete value of VLAN tag, priority,
VLAN ID
Type: Protocol type, value 0x9001
The subtype of the protocol, represents
loopback detection, value 0x0001
0x0000, reserve at present
0x0008, the length of the loopback
detection packet head
MAC address of OLT system
Serial number of the packet, it will be
automatically generated before forwarding
the packet
Port number, the 85 product is global port
number
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