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Loop Protecion

 
Gastert
Occasional Visitor

Loop Protecion

Hi All, 

Hope you can clear / explain some problem we got. 

We've got about 20 HP 1810-24G switches in our network. About 10 of them occasionally log that loop protection has enabled on port 23 (the uplink). But there is no loop in the network, also the log comes at random times on different switches. (so not at the same time). Some times for days nothing, and then about 10 time after each other. Also in the evening or at night, when nobody is at work.

We also got 6 HP 6200 fiber connection switches with STP enabled, these switches log nothing about loops of any kind.

In the attached picture you can see only one device is connected, but the uplink gives LOOP_PROT. 

The are all on firmware P2.2

Is it buggy? of Faulty? Or.....

Hope to hear from you guys. 

Arno

 

3 REPLIES
network_king
HPE Pro

Re: Loop Protecion

Table 1. Loop Protection Fields Field Description Loop Protection Enable this feature globally. Transmission Time Enter the time interval, in seconds, between sending Loop Protection packets. Shutdown Time Set the number of seconds that a port remains shut down if a loop has been detected on the port. Loop Protection Select If Loop Protection is enabled on a port, select one of the following actions to occur when a loop is detected: • Log—The event is logged and the port remains operational. • Shutdown port—The port is shut down for the configured period. • Log and Shutdown Port—The event is logged and the port it shut down for the configured period. Interface / Loop Protection Select Enable for each port on which you want to use this feature. Action If Loop Protection is enabled on a port, select one of the following actions to occur when a loop is detected: • Log—The event is logged and the port remains operational. • Shutdown port—The port is shut down for the configured period. • Log and Shutdown Port—The event is logged and the port it shut down for the configured period. Tx Mode If Loop Protection is enabled on a port, select Enable to allow the port to forward packets to the multicast destination MAC address designated for the Loop Protection feature. Select Disable to disallow forwarding.

Click Apply to save any changes for the current boot session; the changes take effect immediately.

To view a summary of how this feature is configured on each port, click Status > Loop Protection in the navigation pane.


Information for this document can be found at the following Hyperlink: 




 

use link for reference / configuration guide https://support.hpe.com/hpsc/doc/public/display?docId=c04622710

 

I am an HPE Employee

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Gastert
Occasional Visitor

Re: Loop Protecion

Hi, 

Thank you for taking time to answer my question. But I don't understand what you are trying to say...

You copied a piece from a manual?

Can you clarify this more please? 

thank you. 

Arno

LCTechMan
Occasional Visitor

Re: Loop Protecion

It is my understanding you only enable loop protection on your "access" ports, not your uplinks.  It's meant to keep the end user from creating a loop if they plug up a switch and create a loop.  We do not enable loop protect on our uplink ports, only end user device ports.