Configuration Guide 102
Managing Physical Interfaces Configuration Examples
7.3 Example for Loopback Detection
7.3.1 Network Requirements
As shown below, Switch A is a convergence-layer switch connecting 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 7-8 Network Topology
Switch A
Management Host
Access-layer Switches
Gi1/0/1
Gi1/0/2
Loop
Gi1/0/3
7.3.2 Configuration Scheme
Enable loopback detection on ports 1/0/1-3 and configure SNMP to receive the
notifications. For detailed instructions about SNMP, refer to
Configuring SNMP & RMON
.
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.
7.3.3 Using the GUI
1) Choose the menu Switching > Port > Loopback Detection to load the configuration
page.
2) In the Global Config section, enable loopback detection and web refresh globally. Keep
the default parameters and click Apply.
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