4-8
Switching
Loop Protection
Loop Protection
Loops in a network can consume switch resources and degrade performance. Detecting loops manually
can be very cumbersome and time consuming. The HP PS1810 series switch software provides an
automatic Loop Protection feature.
Loop Protection may be enabled or disabled globally and on a port-by-port basis. When enabled globally,
the software sends loop protection packets to a reserved layer 2 multicast destination address on all
the ports on which the feature is enabled. Transmission of the packet can be disabled selectively on
certain ports, even when Loop Protection is enabled.
If this multicast packet comes back to the switch with any of the ports’ MAC addresses as the source,
the switch determines that a loop has occurred. The port that received the loop protection packet from
the switch can be shut down for a configured period, or a log entry can be made.
Ports on which Loop Protection is disabled drop the loop protection packets silently.
To display the Loop Protection configuration page, click Switching > Loop Protection in the navigation
pane.
Figure 4-6. Loop Protection
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