Chapter 7. Node and Terminal Plug-ins
Vol. IV-7-80 Alcatel-Lucent
Figure 7-31. 600 Mbps L2 Link Aggregation: Four 150 Mbps Links
Layer 1 Link Aggregation
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.
DA
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