Loop Detection Enable: Check to enable the Loop Detection function on a system basis. The
default setting is disabled.
Detection Interval: This is the time interval (in seconds) that the device will periodically send loop
detection packets to detect the presence of looped network. The valid range is from 1 to 180
seconds. The default setting is 1 seconds.
Looped port unlock-interval: This is the time interval for the system to detect the existence of
loop condition. System un-blocks the looped port if it does not receive any loop-detection packet
during the configured unlock-interval. The unlock-interval can be set from 1 to 1440 minutes. The
default setting is 1440 minutes.
Note:
1. Be aware that Looped port unlock-interval converted into seconds should be greater than or
equal to Detection Interval seconds multiplied by 10. The ‘10’ is a magic number which is for the
system to claims the loop detection disappears when the system does not receive the loop-
detection packet from itself at least 10 times. In general, it can be summarized by a formula below:
60* “Looped port unlock-interval”
≧
10* “Detection Interval“
2. When a port is detected as a looped port, the system keeps the looped port in blocking status
until loop situation is gone. In other words, the system stops forwarding all the traffic via the looped
port. However, the system will process the loop-detection packet received on the looped port.
All VLAN: Check All VLAN box to enable loop detection on all trunk-VLAN-vid configured in the
VLAN Interface under IEEE802.1q Tag VLAN (Refer to Section 4.4.7.4.2)
NOTE: When All VLAN checkbox is checked, it invalidates the configured “Specific VLAN”.
Specific VLAN: Set up loop detection on specified VLAN. The maximum number of VLAN ID is up
to 4 sets.
NOTE: The configured “Specific VLAN” takes effect when All VLAN check-box is unchecked.
Port No.: Click on the checkbox of the corresponding port No. to enable the Loop Detection
function on the specific port(s).
NOTE: Loop Detection and RSTP (Rapid Spanning Tree Protocol) is not allowed to be enabled on
the same port at the same time.
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