About Seth B

Seth B · 07-19-2022

Starting on Monday, 7/11 @ 5:12 PM, our network has been seeing a sudden widespread storm of port security alerts across dozens of sites and ranging across all ages and models of Cisco devices - 3548, 3550, 2960S, 3560, and new 9300. Traditionally, w...

Seth B · 07-20-2022

It may change from site to site as our specific layout for voip sites are to daisy chain PCs from the phones. But the two sites I have specifically been troubleshooting do not have voip and the computers plug directly into the network jacks. The port...

Seth B · 07-19-2022

We also keep STP, STP bpduguard, and STP root guard applied on all interfaces. Nothing trips if port security is removed. One thing we don't have is storm-control, but I've cleared counters at several sites and monitored broadcast as well as hardware...

Seth B · 07-19-2022

Also no problems there. None of the flapping is between network devices. The end user mac addresses are only bouncing within ports of the same switch. We have dozens of sites which only have a single Cisco 9300 and we see bouncing on those, and then ...

Seth B · 07-19-2022

There are no APs in play here. These are hardwired computers. There are no physical loops or dual homed APs. We did find a site that used a lot of splitters/hubs and we had to power cycle them to clear their cache and allow them to let go of MAC addr...

Member Since	‎07-19-2022 10:08 AM
Date Last Visited	‎07-20-2022 12:01 AM
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Mac Address Flapping Tripping Port Security

Re: Mac Address Flapping Tripping Port Security

Re: Mac Address Flapping Tripping Port Security

Re: Mac Address Flapping Tripping Port Security

Re: Mac Address Flapping Tripping Port Security