Example For Loopback Detection; Network Requirements; Configuration Scheme - TP-Link T1600G-52TS User Manual

Managing Physical Interfaces
Gi1/0/2 N/A
Gi1/0/3 N/A
Gi1/0/4 N/A
...
5.2

Example for Loopback Detection

5.2.1 Network Requirements

As shown below, Switch A is a convergence-layer switch connecting to several access-
layer switches. Loops can be easily caused in case of misoperation on the access-
layer switches. If there is a loop on an access-layer switch, broadcast storms will occur
on Switch A or even in the entire network, creating excessive traffic and degrading the
network performance.
To reduce the impacts of broadcast storms, users need to detect loops in the network via
Switch A and timely block the port on which a loop is detected.
Figure 5-5 Network Topology

5.2.2 Configuration Scheme

Enable loopback detection on ports 1/0/1-3 and configure SNMP to receive the trap
notifications. For detailed instructions about SNMP, refer to
Here we introduce how to configure loopback detection and monitor the detection result
on the management interface of the switch.
Demonstrated with T1600G-52TS, the following sections provide configuration procedure
in two ways: using the GUI and using the CLI.
Gi1/0/1-28,Po1-14
Gi1/0/1-28,Po1-14
Gi1/0/1
Switch A
Gi1/0/1
Gi1/0/2
Loop
Gi1/0/3
Management Host
Access-layer Switches
Configuration Examples
Configuring SNMP &
User Guide
RMON.
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