VLAN Trunking
At the ISP premises, the aggregated LAN traffic from multiple customers (i.e. multiple
VLANs) via one single high capacity Ethernet link (Fast Ethernet) to data equipment
in a Central Office or ISP POP such as an IP edge Router, IP Service Switch or ATM
Switch, can be handled by means of the VLAN trunking feature. VLAN trunking is a
possible application of the IEEE 802.1Q and IEEE 802.1 ad VLAN tagging scheme.
Main benefit of the VLAN trunking feature is that TransLAN
®
cards can hand off end
user LAN traffic via one high capacity LAN port instead of multiple low speed LAN
ports, thus reducing port, space and cabling costs. The following figure illustrates an
example of VLAN Trunking.
Corporate Head Office
Corp. A
Corp. B
PBX
PBX
LAN
LAN
CO or POP
LAN
Metro AM
Corp. A Branch Office
To Internet
PBX
E1
E1
PBX
LAN
LAN
Corp. A Branch Office
Metro AM
Metro AM
STM-16 Metro/Regional Ring
STM-1 Access/Edge Ring
ADM
ADM
ADM
Metro AM
=
Equipped as Metropolis
®
AM
= Firewall
= Router/Switch
E1
E1
nxE1
Digital
Switch
ISP Router
or Metropolis
®
AMS
Network Topologies
Multi-service application with the
TransLAN
®
option board
...................................................................................................................................................................................................................................
365-312-801R7.2
Issue 3, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
3-15
To Next Page
Loading...
