Alcatel-Lucent 9500 MXC User Manual page 470

Chapter 7. Node and Terminal Plug-ins
Layer 1 Link Aggregation
Vol. IV-7-80
600 Mbps L2 Link Aggregation: Four 150 Mbps Links
Figure 7-31.
Eclipse
Eclipse
DAC GE DAC GE
Eclipse
Eclipse
DAC GE DAC GE
P1
P2
P3
P4
P1
VLAN 10
P2
VLAN 20
P3
VLAN 30
P4
With L1 link aggregation a maximum of two links can be aggregated per DAC
GE transport channel, with the aggregation applied on the backplane bus using
circuit cross-connects (CT Circuits screen).
• One DAC GE transport channel comprising NxE1, NxDS1, or NxSTM1
circuits is split across two separate links by assigning the individual circuits
across two separate links.
• The links do not need to be configured for equal capacity.
• The circuits must be assigned in correct sequence, for example circuits 1 to 8
over one link, and 9 to 20 over the other.
Ethernet traffic is split equally between the link timeslots on a byte basis (parallel
bus) meaning data within an Ethernet frame is transported across both links.
Compared to L2 aggregation it provides optimum payload balance regardless of
the throughput demands of individual user connections. Whether there is one, a
few or many concurrent sessions, traffic is always split between the links based
on the configured capacity of the links.
In the event a link is lost, its traffic is assigned to the remaining link.
Radio Link 1
DAC GE DAC GE
Radio Link 2
Radio Link 3
DAC GE DAC GE
Radio Link 4
150 Mbps
C1
C1
C2 C2
150 Mbps
150 Mbps
C1 C1
C2
C2
150 Mbps
Eclipse
Eclipse
Eclipse
Eclipse
P1
P2
P3
P4
P1
VLAN 10
P2
VLAN 20
P3
VLAN 30
P4
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