User's Manual

C HAPTER 4 | Configuring the Switch
Configuring Loop Protection
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USAGE GUIDELINES
◆ The default settings for the control frame transmit interval and recover
time may be adjusted to improve performance for your specific
environment. The response mode may also need to be changed once
you determine what kind of packets are being looped back.
◆ Loopback detection must be enabled both globally and on an interface
for loopback detection to take effect.
PARAMETERS
These parameters are displayed:
Global Configuration
◆ Enable Loop Protection – Enables loopback detection globally on the
switch. (Default: Disabled)
Loopback detection must be enabled globally for the switch and
enabled for a specific port for this function to take effect.
◆ Transmission Time – The transmission interval for loopback detection
control frames. (Range: 1-10 seconds)
◆ Shutdown Time – The interval to wait before the switch automatically
releases an interface from shutdown state. (Range: 1-604,800
seconds, or 0 to disable automatic recovery)
If the recovery time is set to zero, any ports placed in shutdown state
will remain in that state until the switch is reset.
When the loop protection mode is changed, any ports placed in
shutdown state by the loopback detection process will be immediately
restored to operation regardless of the remaining recover time.
Port Configuration
◆ Port – Port identifier.
◆ Enable – Enables loopback detection on a port. (Default: Enabled)
◆ Action – Configures the response to take when a loop is detected on a
port. (Options: Shutdown Port, Shutdown Port and Log, Log Only)
◆ Tx Mode – Controls whether the port is actively generating loop
protection PDUs, or whether it is just passively looking for looped PDUs.
(Default: Enabled)
WEB INTERFACE
To configure loop protection:
1. Click Advanced Configuration, Loop Protection.
2. Enable loop protection globally, and adjust the control frame
transmission interval and shutdown time as required.