Are there other switches on the network? It looks like there is a change in spanning tree and it is switching ports from blocking to forwarding and back to blocking. Is the firmware up to date? If multiple ports are doing it with various devices it probably is not a port or device that is causing it.
I second Josh's suggestion that is seems like a spanning tree issue. Another place to look is duplicate IP addresses. To check for this, record the IP address of the flapping port, then unplug the flapping port from the network. Go to another system on the network and ping the recorded address to see if it responds. I have seen identical IP addresses constantly battling it out on the network, toggling network access back and forth causing similar flapping.
DELL-Josh Cr
Moderator
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9.5K Posts
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August 16th, 2017 18:00
Hi,
Are there other switches on the network? It looks like there is a change in spanning tree and it is switching ports from blocking to forwarding and back to blocking. Is the firmware up to date? If multiple ports are doing it with various devices it probably is not a port or device that is causing it.
vt1012
212 Posts
0
August 21st, 2017 15:00
I second Josh's suggestion that is seems like a spanning tree issue. Another place to look is duplicate IP addresses. To check for this, record the IP address of the flapping port, then unplug the flapping port from the network. Go to another system on the network and ping the recorded address to see if it responds. I have seen identical IP addresses constantly battling it out on the network, toggling network access back and forth causing similar flapping.
-B