C5 LinkFlap

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  • Updated 2 years ago
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I have a couple of C5K125-48P2 switches that are connecting back to a Cisco Catalyst 6509 over .50 micron fiber using 10GB-SR-SFPP fiber modules on the Extreme side and X2-10GB-SR fiber modules on the Cisco side.  It seems like once a day one of these connections will go down and then immediately come back up.  On the C5 side it is recording a LinkFlap.  I originally thought this was a fiber optic cable issue.  However, we've had our fiber guys re-terminate both sides ends of the fiber optic cable and they have tested the cable with their Fluke tester and the cable has passed.  They have also replaced all the fiber patch cables.

Has anyone else had any issues with LinkFlaps?  Have you ever seen a bad switchport or fiber module cause LinkFlaps?  I'm still suspecting that this is a layer one problem but my fiber guy is convinced it is a switch issue.
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Chris Minton

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Posted 4 years ago

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Jason Parker, Employee

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I am not aware of a link flap issue on the SecureStacks
Is there a chance that you could attack the GTAC and open a case
Please ask the tech to notify me of the case so I can assist ( Jason Parker)
I would collect a show support and if on console run the command
Dev DumpSFP
Another item to do is to set port trap port# enable
Set logging local console enable file enable
Set logging default severity 7
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Terry Harcleroad

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We have same problem, did you find a resolution?

We have a CISCO 6509 reporting flapping on ports that are using Extreme switches at other end.
Mac address - 00e0.2b00.0001
What can be done to rectify this and eliminate the error clogging up our logs?
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Brandon Clay, Escalation Support Engineer

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This is due to either EDP packets or ELRP packets, both of which are sourced from this MAC address. 

I would suggest disabling EDP on the ports that connect to non-EXOS switches. If this is due to ELRP and you do not want to disable it on those ports, you may want to see if it is possible to exclude a specific log message from the Cisco's log buffer.
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Terry Harcleroad

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Disabling EDP on the Extreme's uplink port did the trick for us, Thanks!
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Chris Minton

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Our switches do not run EXOS. The C5's are running the Enterasys SecureStack OS. What would you suggest for the SecureStack OS?