Manage Loop Prevention - NETGEAR GS908E User Manual

8-Port Gigabit Ethernet Smart Managed Plus Switch Model GS908E
The button for an enabled auto-diagnostic option displays blue.
7. Click the APPLY button.
Your settings are saved.
If an event or problem occurs, the icons for the affected ports display blue. If an unsuccessful firmware
update occurs, the FAILED button displays blue. (The FAILED button is for display only, that is, you
cannot click it. However, you can click the CLEAR button. See the follow step.)
8. To clear an event or problem that displays for an individual auto-diagnostic option and reset the Power
LED, click the CLEAR button in the individual section.
If it is displayed, the CLEAR button displays blue. After you click the CLEAR button, it no longer displays.
However, if you do not resolve a blocked port condition or a problem with a LAG port, after a while the
CLEAR button displays again.
Note If you restart the switch, all conditions are cleared. However, if you do not resolve a
blocked port condition or a problem with a LAG port, the condition will occur again.

Manage Loop Prevention

By default, loop prevention is enabled. If the switch detects a loop, the switch blocks one of the ports that
are part of the loop and the port LED for that port blinks at a constant speed. If two ports are part of a loop,
the port with the highest port number is blocked. For example, if port 1 and port 2 are part of a loop, port 2
is blocked while port 1 continues to process traffic. The loop status (that is, port blocking and LED blinking)
is cleared if the switch does not detect the loop for a period of four seconds.
To manage loop prevention:
1. Open a web browser from a computer that is connected to the same network as the switch or to the
switch directly through an Ethernet cable.
2. Enter the IP address that is assigned to the switch.
The login page displays.
3. Enter the switch password.
The default password is password. The password is case-sensitive.
The HOME page displays.
4. From the menu at the top of the page, select MONITORING.
The CABLE TEST page displays.
5. From the menu on the left, select LOOP PREVENTION.
The LOOP PREVENTION page displays.
6. Disable or enable loop prevention by clicking the button.
When loop prevention is enabled (which is the default setting), the button displays blue.
7. Click the APPLY button.
Your settings are saved.
Diagnostics and Troubleshooting
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