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16 Messages

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302 Points

Thu, Jun 14, 2018 10:21 PM

Answered

Broadcast limiting vs an unmanaged switch with a loop

I'm working with a 7150-24 port switch in a test environment.

I'm looking at how to address potential loops for connected un-managed switches - good or bad, I have to deal with this ugly reality.  While loop-detection DOES work, the affected port doesn't automatically reset once the loop is removed.  The port remains in a err-disable/shutdown state until the loop-detection is cleared on the switch.

From what I see, a loop on the un-managed switch creates a broadcast storm.  Setting a broadcast limit doesn't seem to have any effect on limiting traffic on a given port.

Or does Broadcast limits not apply to broadcast storms?

Responses

Employee

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119 Messages

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2.2K Points

2 years ago

Hey Scott, 

There is an auto recovery mechanism you can enable. Please check the L2 guide. The general config would be something like this:

ICX(config)# errdisable recovery cause loop-detection

There is also a configurable timer for the feature:

ICX(config)# errdisable recovery interval

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16 Messages

 • 

302 Points

2 years ago

Thank you!


I'll give that a test as that would solve the issue I had with using loop-detection.


I am confused about why broadcast limits didn't appear to be working the way I'd expected them to work.