User Manual
Product information and planning
9500 MPR Rel. 3.1
3DB18809AAAA Issue 1192/980
2.8.19 LAG (Link Aggregation Group)
2.8.19.1 LAG overview
Link Aggregation groups a set of ports so that two network nodes can be interconnected using multiple
links to increase link capacity and availability between them.
When aggregated, two or more physical links operate as a single logical link with a traffic capacity that
is the sum of the individual link capacities.
This doubling, tripling or quadrupling of capacity is relevant where more capacity is required than can be
provided on one physical link.
Link aggregation also provides redundancy between the aggregated links. If a link fails, its traffic is redi-
rected onto the remaining link, or links.
If the remaining link or links do not have the capacity needed to avoid a traffic bottleneck, appropriate QoS
settings are used to prioritize traffic so that all high priority traffic continues to get through.
The Link Aggregation is performed according to 802.3ad and can be applied to Radio ports and to User
Ethernet ports.
2.8.19.1.1 Link aggregation on Radio ports (Radio LAG)
Link aggregation can be applied to radio ports (in this case it is named Radio Link Aggregation).
Figure 96. Radio LAG overview
In this example, user traffic is split up into radio channels. Main advantages:
– Throughput. The overall radio Ethernet throughput is more than 1 Gbit/sec (4 x 350 Mbit/s, being
this the value for 256QAM@56 MHz)
– Protection. In case of a failure of one of the three channels, all the traffic is redirected on the remain-
ing link (with a throughput of around 0.35 Gbit/sec). The discarded or dropped traffic is the one with
lower priority: high priority traffic is still running on the remaining active channels.
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