Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 376)

A service VF thus represents a virtualized, normalized VLAN domain, where different link-protocol
VLAN identifiers (port number, MAC address, and customer VLAN ID, or C-VID) are mapped to the
same VLAN. In other words, VMs on the same service VF belong to the same forwarding domain,
even though the attachment interfaces use different classification rules. When a VM moves among
these interfaces, the Layer 2 forwarding domain does not change.
Extending a service VF among VCS data centers makes it possible to migrate VMs across those data
centers.
Virtual Fabrics features
The following VLAN switch-port configurations are supported:
• Regular 802.1Q configuration (VLAN IDs 1 through 4095, with the exception of reserved VLANs)
• VLAN classification by means of a 802.1Q tag at the trunk port
• VLAN classification by means of a source MAC address at the access port
The following standard VLAN features remain supported by the service VF feature:
• Private VLANs (PVLANs)
• Layer 3 virtual Ethernet (VE) interfaces
• VLAN classifiers
• IGMP snooping
• VLAN ACLs
• Automatic Migration of Port Profiles (AMPP)
• RSPAN
• xSTP
In addition, support is now provided for transport service VFs, enabling a provisioning model in which
a specific group of 802.1Q VLANs at an interface is classified into a common forwarding domain.
The maximum number of VLANs supported in this release, 802.1Q and classified, is as follows:
• There is fabric-wide support for 8K VF instances. The number of VFs supported on a local switch is
platform-dependent.
• In a pure transport service deployment, port-based transport VFs are supported on every edge port,
with up to 2048 VLANs (both 802.1Q and classified) across all ports.
For additional scalability details, refer to Virtual Fabrics performance considerations on page 379.
For example topologies and detailed discussion, refer to Virtual Fabrics configuration overview on
page 379.
Virtual Fabrics considerations and limitations
FGL limitations
Network OS 4.1.0 supports pre-IETF standard Fine-Grained Labeling (FGLs) on ISLs. IETF defines
the Ethertype for inner and outer labels as 0x893B. The outer and inner Ethertypes on ISLs are set to
0x893B and 0x8100, respectively.
FCoE VLAN limitations
FCoE VLANs can be only 802.1Q VLANs. All tenant FCoE traffic rides on the same default FCoE
VLAN, 1002. This is the same as in previous releases. An FCoE VLAN can be used as a classification
tag on a port if it is not configured as an FCoE port.
Virtual Fabrics features
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