[Beowulf] odd vlan issue

Greg Lindahl lindahl at pbm.com
Wed Jun 16 04:48:21 UTC 2021

On Mon, Jun 14, 2021 at 12:38:50PM -0400, Michael Di Domenico wrote:
> i got roped into troubleshooting an odd network issue.  we have a mix
> of cisco (mostly nexus) gear spread over our facility.  on one
> particular vlan it's operating as if it's a hub instead of switch.

I have run into this situation when I have servers that have incoming
UDP traffic and never talk or do TCP. The switches have no idea where the
server is, so they broadcast all of the incoming packets.

An ARP reply or connecting with TCP tells the switch which port to use.

-- greg

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