How Vlan Stacking Works - Alcatel-Lucent OmniSwitch 6800 Series Network Configuration Manual

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Configuring VLAN Stacking

How VLAN Stacking Works

On the Provider Edge bridge (PE), a unique tunnel (SVLAN) ID is assigned to each customer. The tunnel

ID corresponds to a VLAN ID, which is created on the switch when the tunnel is configured. For exam-

ple, when tunnel 100 is created, VLAN Stacking software interacts with VLAN Manager software to

configure a VLAN 100 on the switch. VLAN 100 is the provider bridge VLAN that will tunnel customer

VLAN traffic associated with tunnel 100. So, there is a one to one correspondence between a tunnel and

its provider bridge VLAN ID. In fact, tunnel and VLAN are interchangeable terms when referring to the

provider bridge configuration.

VLAN Stacking refers to the tunnel encapsulation process of appending to customer packets an 802.1Q

tag that contains the tunnel ID associated to that customer's provider bridge port and/or VLANs. The

encapsulated traffic is then transmitted through the Ethernet metro area network (EMAN) cloud and

received on another PE bridge that contains the same tunnel ID, where the packet is then stripped of the

tunnel tag and forwarded to the traffic destination.

The following provides an example of how a packet ingressing on a VLAN Stacking UNI port that is

tagged with the customer VLAN (CVLAN) ID transitions through the VLAN Stacking encapsulation

Packet with CVLAN tag ingressing on a user port.

Double Tagging inserts the SVLAN tag in the packet. The packet is sent out the network port with

double tags (SVLAN+CVLAN).

VLAN Translation replaces the CVLAN Tag with SVLAN Tag. The packet is sent out the network

port with a single tag (SVLAN).

OmniSwitch 6800/6850/9000 Network Configuration Guide

VLAN Stacking Overview