Vlan Stacking Application Example - Alcatel-Lucent OmniSwitch 6850-48 Network Configuration Manual

Configuring VLAN Stacking

VLAN Stacking Application Example

The VLAN Stacking feature provides the ability to transparently connect multiple customer sites over a
single shared service provider network. This section demonstrates this ability by providing a sample
VLAN Stacking configuration that tunnels customer VLANs (CVLAN) inside a service provider VLAN
(SVLAN} so that customer traffic is transparently bridged through a Metropolitan Area Network (MAN).
The illustration below shows the sample VLAN Stacking configuration described in this section. In this
configuration, the provider edge bridges will encapsulate Customer A traffic (all CVLANs) into SVLAN
100 and Customer B traffic (CVLAN 10 only) into SVLAN 200. In addition, the CVLAN 10 inner tag
priority bit value is mapped to the SVLAN out tag priority value. The customer traffic is then transpar-
ently bridged across the MAN network and sent out to the destined customer site.
Double-tagging is the encapsulation method used in this application example, This method consists of
appending the SVLAN tag to customer packets ingressing on provider edge UNI ports so that the traffic is
bridged though the provider network SVLAN. The SVLAN tag is then stripped off of customer packets
egressing on provider edge UNI ports before the packets are delivered to their destination customer site.
Customer A
Site 1
All CVLANs
UNI 1/1
PE1
UNI 2/1
OmniSwitch AOS Release 6 Network Configuration Guide
MAN CLOUD
MAN CLOUD
NNI 3/1
CVLAN 10
Customer B
Site 1
VLAN Stacking Application
All CVLANs
SVLAN 100
NNI 3/1
SVLAN 200
CVLAN 10
Customer B
Site 2
September 2009
VLAN Stacking Application Example
Customer A
Site 2
UNI 1/1
PE2
UNI 2/1
page 9-21