Port on Summit X440-48t don't work o.k.

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It's more like weird issue, it first happen like a month ago, the user couldn't get IP address, was the only user on the switch, we change the patch cords, change the vlan to make short it was not a shortage of ip's on that segment (via DHCP), and then it work, but today happen again, even connecting directly to the switch with my laptop, at the end, I connect the user in a different port on the same switch (also tried without Auto option, no success) what do you suggest me to check?

Thanks

p.s. so far is the only user/port with this issue
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Karina Del Moral

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Posted 2 years ago

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David Coglianese, Embassador

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is there an FDB entry on the port?
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Karina Del Moral

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No, because, when I try to check to which port was connected (without following the cable on the rack) I couldn't find it with the show fdb command
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David Coglianese, Embassador

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So you know the mac of the PC?
You searched the FDB for the mac and could not find it?

If the above are true I would call tac as I have seen that issue before.
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Karina Del Moral

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Yes, I knew the mac, and couldn't find it... So I'll reported to TAC then, just as port in switch not working properly
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David Coglianese, Embassador

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Yes,  we have seen were a port or group of ports on a switch would enter a weird state that kept them from learning mac addresses. As a result they could not forward traffic to the devices connected to them. 

Best of luck,
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Karina Del Moral

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Thanks, that what I like about this community! always so helpful !
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Drew C., Community Manager

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I'd start with wireshark on their PC.  Disconnect the network cable, start the wireshark capture, and connect the cable again.  This way you can see everything that happens with DHCP/BOOTP.
You could also set a static IP and gateway on the PC to see what's happening.
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Karina Del Moral

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I'll do that, I check with two different computers using the same port,and different vlan's, and since the user needed to work I use a different port, I'll do the capture.

thanks