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Oracle VM Server for SPARC 2.1 Administration Guide     Oracle VM Server for SPARC
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Part I Oracle VM Server for SPARC 2.1 Software

1.  Overview of the Oracle VM Server for SPARC Software

2.  Installing and Enabling Software

3.  Security

4.  Setting Up Services and the Control Domain

5.  Setting Up Guest Domains

6.  Setting Up I/O Domains

7.  Using Virtual Disks

8.  Using Virtual Networks

Introduction to a Virtual Network

Virtual Switch

Virtual Network Device

Inter-Vnet LDC Channels

Virtual Device Identifier and Network Interface Name

Find Oracle Solaris OS Network Interface Name

Assigning MAC Addresses Automatically or Manually

Range of MAC Addresses Assigned to Logical Domains

Automatic Assignment Algorithm

Duplicate MAC Address Detection

Freed MAC Addresses

Using Network Adapters With Logical Domains

Determine If a Network Adapter Is GLDv3-Compliant

Configuring Virtual Switch and Service Domain for NAT and Routing

Set Up the Virtual Switch to Provide External Connectivity to Domains

Configuring IPMP in a Logical Domains Environment

Configuring Virtual Network Devices Into an IPMP Group in a Domain

Configuring and Using IPMP in the Service Domain

Using Link-Based IPMP in Logical Domains Virtual Networking

Configure Physical Link Status Updates

Configuring and Using IPMP in Releases Prior to Logical Domains 1.3

Configuring IPMP in the Guest Domain

Configuring IPMP in the Service Domain

Using VLAN Tagging



Assign VLANs to a Virtual Switch and Virtual Network Device

Install a Guest Domain When the Install Server Is in a VLAN

Using NIU Hybrid I/O

Configure a Virtual Switch With an NIU Network Device

Enable Hybrid Mode

Disable Hybrid Mode

Using Link Aggregation With a Virtual Switch

Configuring Jumbo Frames

Configure Virtual Network and Virtual Switch Devices to Use Jumbo Frames

Compatibility With Older (Jumbo-Unaware) Versions of the vnet and vsw Drivers

9.  Migrating Domains

10.  Managing Resources

11.  Managing Configurations

12.  Performing Other Administration Tasks

Part II Optional Oracle VM Server for SPARC Software

13.  Oracle VM Server for SPARC Physical-to-Virtual Conversion Tool

14.  Oracle VM Server for SPARC Configuration Assistant

15.  Using the Oracle VM Server for SPARC Management Information Base Software

16.  Logical Domains Manager Discovery

17.  Using the XML Interface With the Logical Domains Manager



Virtual Network Device

A virtual network (vnet) device is a virtual device that is defined in a domain connected to a virtual switch. A virtual network device is managed by the virtual network driver, and it is connected to a virtual network through the hypervisor using logical domain channels (LDCs).

A virtual network device can be used as a network interface with the name vnetn, which can be used like any regular network interface and configured with the ifconfig command .

You can add a virtual network device to a domain, set options for an existing virtual network device, and remove a virtual network device by using the ldm add-vnet, ldm set-vnet, and ldm rm-vnet commands, respectively. For more information, see the ldm(1M) man page.

Figure 8-1 Setting Up a Virtual Network

image:Diagram shows how to set up a virtual network as described in the text.

Following is an explanation for the example in Figure 8-1.

Basically the virtual switch behaves like a regular physical network switch and switches network packets between the different systems, such as guest domains, service domain, and physical network, to which it is connected.

Inter-Vnet LDC Channels

Until the Oracle VM Server for SPARC 2.1 release, the Logical Domains Manager would assign LDC channels in the following manner:

The inter-vnet LDC channels are configured so that virtual network devices can communicate directly to achieve high guest-to-guest communications performance. However, as the number of virtual network devices in a virtual switch device increases, the number of required LDC channels for inter-vnet communications increases exponentially.

Starting with the Oracle VM Server for SPARC 2.1 release, you can choose to enable or disable inter-vnet LDC channel allocation for all virtual network devices attached to a given virtual switch device. By disabling this allocation, you can reduce the consumption of LDC channels, which are limited in number.

Disabling this allocation is useful in the following situations:

By not assigning inter-vnet channels, more LDC channels are available for use to add more virtual I/O devices to a guest domain.

Note - If guest-to-guest performance is of higher importance than increasing the number of virtual network devices in the system, do not disable inter-vnet LDC channel allocation.

The following figure shows a typical virtual switch that has three virtual network devices. The inter-vnet-link property is set to on, which means that inter-vnet LDC channels are allocated. The guest-to-guest communications between vnet1 and vnet2 is performed directly without going through the virtual switch.

Figure 8-2 Virtual Switch Configuration That Uses Inter-Vnet Channels

image:Diagram shows a virtual switch configuration that uses inter-vnet channels.

The following figure shows the same virtual switch configuration with the inter-vnet-link property set to off. That means that inter-vnet LDC channels are not allocated. You can see that fewer LDC channels are used than when the inter-vnet-link property is set to on. In this configuration, guest-to-guest communications between vnet1 and vnet2 must go through vsw1.

Note - Disabling the assignment of inter-vnet LDC channels does not prevent guest-to-guest communications. Instead, all guest-to-guest communications traffic goes through the virtual switch rather than directly from one guest domain to another guest domain.

Figure 8-3 Virtual Switch Configuration That Does Not Use Inter-Vnet Channels

image:Diagram shows a virtual switch configuration that does not use inter-vnet channels.