Information About Layer 2 Ethernet Switching; Port Model - Cisco Nexus 1000V Troubleshooting Manual

Layer 2 Switching
This chapter describes how to identify and resolve problems that relate to Layer 2 switching and includes
the following sections:
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Information About Layer 2 Ethernet Switching

The Cisco Nexus1000V is a distributed Layer 2 virtual switch that extends across many virtualized hosts.
It consists of two components:
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Port Model

This section includes the following topics:
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OL-31593-01
Information About Layer 2 Ethernet Switching, page 12-1
Port Model, page 12-1
Layer 2 Switching Problems, page 12-4
Layer 2 Switching Troubleshooting Commands, page 12-7
Troubleshooting Microsoft NLB Unicast Mode, page 12-12
Troubleshooting BPDU Guard, page 12-14
The Virtual Supervisor Module (VSM), which is also known as the control plane (CP). The VSM
acts as the supervisor and contains the Cisco CLI, configuration, and high-level features.
The Virtual Ethernet Module (VEM), which is also known as the data plane (DP). The VEM acts as
a line card and runs in each virtualized server to handle packet forwarding and other localized
functions.
Viewing Ports from the VEM, page 12-2
Viewing Ports from the VSM, page 12-3
C H A P T E R
Cisco Nexus 1000V Troubleshooting Guide, Release 5.2(1)SV3(1.1)
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