Each access node is individually connected to the hub node over a single SDH
connection (or even one SDH connection per LAN port). The trunking LAN interface
is a network-role LAN port. The VLAN tags in the Ethernet frames are preserved, i.e.
made available to the service provider, and can thus be used for further processing.
A high WAN port density is required in the hub-node.
Averaging of the peak traffic loads of each access node (or LAN port) is not used.
Each SDH link bandwidth has to be engineered for the corresponding amount of peak
traffic.
Distributed aggregation in the access network
This figure shows an example of distributed aggregation in the access network:
X
SDH
network
LAN
LAN
LAN
LAN
Trunking LAN interface
(network-role LAN port)
Hub node
Internet
VLAN
,,17 18 19
VLAN
,5 91
VLAN
,21 22
VLAN
66
VLAN , ,
,,
5
66 91
17 18 19
21 22
,,
,
ISP router
Access
nodes
Access
nodes
Traffic provisioning
Ethernet over SDH applications
....................................................................................................................................................................................................................................
365-312-807R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
8-55
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