VMware DV switch

I am new to working with dv switches.  When i am going through ESXi hosts ( 4.1) logs, i can see repeated below uplink failure/restored events occurring. Could you please help if its  due to refreshment or any unusual happening in uplink level

1 - WHAT IS PORT ITS POINTING TO( I CAN SEE MULTIPLE PORTS)
2 - WHY THE PERIODIC RESTORED EVENTS FOR ALL THE NIC COONETED TO DVSWITCH

The port 1691 link was down in the vNetwork
Distributed Switch  in XXX_XXX_XXXX
info

Uplink redundancy restored on DVPorts: "1691/df d7
36 50 3e 3c 23 7a-87 02 d2 96 e1 09 9f 6d". Physical
NIC vmnic7 is up.
kbjijoAsked:
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coolsport00Commented:
Well, a "vmnic" is basically just a physical NIC on an ESXi Host. The 'port' 1691 referred to here is seemingly just a "virtual port" on the vDS. If the vmnic (i.e. physical Host NIC) is having stability issues (i.e. is going bad for some reason) or maybe the physical/external switch port it's connected to is having issues, you will see connectivity events.

~coolsport00
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kbjijoAuthor Commented:
Initially i suspected with physical switches level. But i can see the same events down/up on almost all esxi even they are connected with different uplinks. Each time the DV port id also different.

1- if this cause due any particular activity  ( eg: vmotion/ exiting from maintenance .. etc)


How to nail down the issue.
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