Viewing Ports From The Vsm - Cisco Nexus 1000V Troubleshooting Manual

Chapter 11 Layer 2 Switching
S e n d d o c u m e n t c o m m e n t s t o n e x u s 1 k - d o c f e e d b a c k @ c i s c o . c o m .
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Viewing Ports from the VSM

Figure 11-2
Figure 11-2
OL-28795-01
On the physical side of the switch, from bottom to top:
Each physical NIC in VMware is represented by an interface called a vmnic. The vmnic number is
allocated during VMware installation, or when a new physical NIC is installed, and remains the
same for the life of the host.
Each uplink port on the host represents a physical interface. It acts a lot like an lveth port, but
because physical ports do not move between hosts, the mapping is 1:1 between an uplink port and a
vmnic.
Each physical port added to Nexus1000V switch appears as a physical Ethernet port, just as it would
on a hardware-based switch.
The uplink port concept is handled entirely by VMware, and is used to associate port configuration
with vmnics. There is no fixed relationship between the uplink # and vmnic #, and these can be
different on different hosts, and can change throughout the life of the host. On the VSM, the Ethernet
interface number, such as ethernet 2/4, is derived from the vmnic number, not the uplink number.
shows the VSM view ports.
VSM View of Ports
VEM 3
eth3/3
eth3/2
VM-A
VSM
L2 Cloud
VEM 4
eth4/2 eth4/3
Upstream
Switch
Cisco Nexus 1000V Troubleshooting Guide, Release 4.2(1)SV2(2.1)
Port Model
VEM 5
eth5/2
eth5/3
VM-B
11-3