Cisco Nexus 1000V Podręcznik wdrażania - Strona 11
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Figure 3.
Opaque Data
Opaque data is a collection of Cisco Nexus 1000V Series configuration parameters that is maintained by the VSM
and propagated to VMware vCenter Server when the link between the two is established. The opaque data contains
configuration details that each VEM needs to establish connectivity to the VSM during VEM installation.
Among other content, the opaque data contains:
Switch domain ID
●
Switch name
●
•Control and packet VLAN IDs
●
System port profiles
●
When a new VEM comes online, either after initial installation or upon reboot of an VMware ESX host, it is essentially
an unprogrammed line card. To be properly configured, the VEM needs to communicate with the VSM. VMware
vCenter Server automatically pushes the opaque data to the VEM, which the VEM uses to establish communication
with the VSM and download the appropriate configuration data.
Virtual Ethernet Module
The VEM provides the Cisco Nexus 1000V Series with network connectivity and forwarding capabilities much like a
line card within a modular switching platform. Unlike multiple line cards within a single chassis, each VEM acts as an
independent switch from a forwarding perspective.
The VEM is tightly integrated with VMware ESX. The VEM is installed on each VMware ESX host as a kernel
component, in contrast to most third-party networking services for VMware, which are usually installed as virtual
machines.
Unlike with the VSM, the VEM's resources are unmanaged and dynamic. Although the storage footprint of the VEM is
fixed (approximately 6.4 MB of disk space), RAM utilization on the VMware ESX host is variable, based on the
configuration and scale of the Cisco Nexus 1000V Series deployment. In a typical configuration, each VEM can be
© 2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
Downloading the XML Extension File
Deployment Guide
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