Port Limitation on Nexus 1000v

Unanswered Question
Mar 10th, 2010

I heard Nexus 1000V has a port limitation of ~374. Is that accurate? I recall something about 128 vNICs on CNA 2Gen. Any ideas? Thanks.

I have this problem too.
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pzpgd1mlf Sun, 03/14/2010 - 12:25

I have learned that this is actually a limitation from vCenter:

vNetwork Distributed Switch

Total virtual network switch ports per host (vDS and vSS ports) 4096

Distributed virtual network switch ports per vCenter                     6000

Distributed port groups per vCenter                                           512

Distributed switches per vCenter                                                  16

Hosts per distributed switch                                                         64

So, 6000 / 16 = 375 ports

abdulkerim hass... Tue, 11/15/2011 - 06:54

What is the maximun number of physical NICs (10Gig only 1Gig only and 10Gig and 1Gig combination) per ESX host migrated to Nexus 1000v ? Plz let me know as soon as you can.



Robert Burns Tue, 11/15/2011 - 07:20


The software (port profile, vlans etc) limits are found here:


For hardware limiations (in the case of NICs) we would follow VMware Host Limitations:





abdulkerim hass... Tue, 11/15/2011 - 08:24

Thanks Robert,

Plz allow me to follow this up with another question. What is the problem of having two or more uplink port-profile having sharing same set of VLANs being applied to NICs of the same ESX host? Some mentioned looping issues. I was under the impression, Nexus 1000v protects/avoid loops by implementing its simple loop protection algorithm even though it is not running STP. Does that mean we have to be carefull when designing our uplink connection when we have multiple NICs per ESX and we want traffic segregation (not allowing all VLANS on all NICs).




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