Carriers offering triple play services over the broadband infrastructure require
advanced QoS and redundancy features from the backhaul network that are
hard to address with Layer 2 switching. For example, carriers may wish to perform
Connection Admission Control (CAC) for video services and may need to have sub-50-ms
restoration for both voice and video services. Also, as broadband deployments increase
in scale, the ability of EoMPLS to support MAC hiding (for point-to-point services) and
VLAN translation becomes more useful. A common architecture is to use Ethernet
pseudowires for unicast traffic, with redundant pseudowires toward dual BRAS devices,
and H-VPLS for multicast IP TV (as discussed in ???Triple-play Aggregation,??? later
in this chapter). Another benefit when using EoMPLS is that legacy ATM DSLAMs
may be connected to the same infrastructure using ATM pseudowires. Also, because
EoMPLS uses the IP control plane, it may be possible to integrate the backhaul and
service control planes into one routing instance, reducing the operational overhead of
operating multiple networks.
When Does This Solution Not Fit?
No technology is applicable to all environments.
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