IBM Partner Pavilion Vitrual Switch Extension BMD00082 Benutzerhandbuch

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  Chapter 3: Switch Virtualization

BMD00082, February 2009

Switch resources can be assigned to VSGs. Up to 32 VSGs are available. Each VSG behaves 
independently, which allows for segmenting the switch into smaller logical entities. Within 
each VSG, member ports can be aggregated into trunks, combining their bandwidth.

Two different types of resources can be assigned to VSGs:

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Ports (internal and external)

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VMs

Each internal and external port can be independently assigned to one of the 32 available VSGs. 
Each VSG can contain multiple ports, but each port can belong to only one VSG.

VSGs for port groups must have the following characteristics: 

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It is recommended that each VSG contain internal server ports and external ports for 
proper network operation.

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By default, all external ports in the same VSG are placed into one trunk to aggregate their 
bandwidth. For more information, see 

For VSG port group and trunk configuration, see 

The switch automatically discovers VMs that reside in the hypervisor directly connected to the 
switch. As with ports, VMs can be independently assigned to VSGs in order to group or sepa-
rate them. Optionally, uplink ports can also be assigned to VSGs that include VMs.

The switch will accept a maximum of 1024 VMs. Once this limit is reached, the switch will 
reject additional VMs.

In some rare situations, the switch may reject the addition of new VMs prior to reach-

ing the 1024 VM limit. This can occur when the hash bucket corresponding to the new VM is 
already full. If this occurs, change the virtual machine’s MAC address and retry the operation. 
The MAC address can usually be changed from the virtualization platform’s management con-
sole (such as the VMware Virtual Center). This limitation is independent of whether switches 
are acting alone or as part of a stack.