Reservation and limit are supported on DVS (Distributed Virtual Switch) or “opaque” (NSX) switch types only; they are not supported on the default VSS switch type. Between reservation and limit, bandwidth is allocated on a share-based system, which is not meaningful to expose to a guest OS.

$ vmware-toolbox-cmd stat raw text vnet 00:0c:29:1e:23:f3
num.tx = 209
size.tx = 38137
num.rx = 10920
size.rx = 1312789
reservation = 0
limit = -1

num.tx – number of packets transmitted.

size.tx – bytes transmitted.

num.rx – number of packets received.

size.rx – bytes received.

reservation – guaranteed minimum bandwidth for this vNIC.

limit – maximum bandwidth allowed for this vNIC.