OmniSwitch 6800/6850/9000 Network Configuration Guide March 2008 page 6-1
6 Configuring VLAN
Stacking
VLAN Stacking provides a mechanism to tunnel multiple customer VLANs (CVLAN) through a service
provider network using one or more service provider VLANs (SVLAN) by way of 802.1Q double-tagging
or VLAN Translation. This feature enables service providers to offer their customers Transparent LAN
Services (TLS). This service is multipoint in nature so as to support multiple customer sites or networks
distributed over the edges of a service provider network.
The VLAN Stacking application operates in one of two modes: legacy and service. The two modes basi-
cally differ in how VLAN Stacking is configured, with the service mode offering the following additional
enhancements that are not available in the legacy mode:
• Ethernet service-based approach that is similar to configuring a virtual private LAN service (VPLS).
• Ingress bandwidth sharing across User Network Interface (UNI) ports.
• Ingress bandwidth rate limiting on a per UNI port, per CVLAN, or CVLAN per UNI port basis.
• CVLAN (inner) tag 802.1p-bit mapping to SVLAN (outer) tag 802.1p bit.
• CVLAN (inner) tag DSCP mapping to SVLAN (outer) tag 802.1p bit.
• Profiles for saving and applying traffic engineering parameter values.
Configuring VLAN Stacking in the legacy mode consists of using a port or port-VLAN level approach to
tunneling customer traffic. Configuring VLAN Stacking in the service mode consists of using an approach
based on defining an Ethernet service to tunnel customer traffic. Both modes are exclusive in that the
switch can only operate in one mode or the other. In addition, each mode has it’s own unique CLI
command syntax.
Throughout this chapter, the term “port-based VLAN Stacking” refers to functionality available in the
legacy mode and the term “service-based VLAN Stacking” refers to functionality available in the service
mode.
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