The SDH bandwidth can be shared by many end-users, which allows to gain from the
statistical effects in the traffic offered by each end-user (“statistical multiplexing”).
Thus, the distributed aggregation in the access network configuration is more
bandwidth efficient than the trunking in the hub node topology.
Another difference is that in the trunking in the hub-node topology, the hub node has
to support many WAN ports, which is not the case in the distributed aggregation in the
access network configuration.
A certain bandwidth allocation fairness can be guaranteed by applying ingress rate
control in the access nodes. Please note that ingress rate control is not supported on
GbE TransLAN
®
cards but only on E/FE TransLAN
®
cards.
Mode of operation
Trunking applications can be realized by using any of the following TransLAN
®
operational modes:
• LAN-VPN mode
• STP virtual switch mode compliant with IEEE 802.1Q
• STP virtual switch mode compliant with IEEE 802.1ad (provider bridge mode)
X
SDH
network
LAN
LAN
LAN
LAN
Trunking LAN interface
(network-role LAN port)
Internet
VLAN
,,17 18 19
VLAN
,5 91
VLAN
,21 22
VLAN
66
VLAN , ,
,,
5
66 91
17 18 19
21 22
,,
,
ISP router
Hub node
Access
nodes
Access
nodes
Ethernet Overview
Ethernet over SDH applications
....................................................................................................................................................................................................................................
365-312-801R7.2
Issue 3, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
11-25
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