Alcatel-Lucent 7750 Network Router User Manual


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Alcatel-Lucent 7750 Service Router
ALCATEL-LUCENT HIGH-SCALE MEDIA DEPENDENT ADAPTER
The Alcatel-Lucent 7750 Service Router (SR) with High-Scale Media Dependent Adapter (HS-MDA) extends
the service-rich capabilities of the industry-leading 7750 SR by enhancing the scale, density and granularity
of service queues. Intended for very large-scale deployments of legacy and emerging residential, business
and mobile services, the HS-MDA optimizes the 7750 SR performance for delivering packet services engineered
with high statistical gain at the unified IP/MPLS and Carrier Ethernet service edge.
The 7750 SR supports the HS-MDA as
a hot-swappable, half-slot module with
10 ports for Gigabit Ethernet (GigE). Each
port is compatible with optical GigE Small
Form Factor Pluggable (SFP) transceivers
(see Table 1).
Features
• Supports160,000ingressqueuesand
160,000egressqueuesoneach7750
SR HS-MDA, providing each of 20,000
subscriberswitheightqueuesand
eight separate scheduling classes
• Usesaport-basedscheduler,with
eight strict priority schedulers, for
each HS-MDA egress port:
¬ Allows configuring each strict
scheduler per egress port with a
shaping rate, limiting the amount
of bandwidth allowed for that level
¬ Supports weighted servicing for
selected scheduling classes by using
two weighted groups, allowing
flexible usage
• Supports64egresssecondaryshapers,
providing a control mechanism to
prevent downstream overruns
at specific access nodes:
¬ Locates each shaper before the
egress port scheduler in the data
path, ensuring that when a partic-
ular destination’s configured peak
information rate (PIR) is exceeded,
allqueuesforthatdestinationwill
stop.Thisisdoneforeachqueue
group that has a per-subscriber
context.
• Offersanonboard,robust,exible
and deep buffer-pool hierarchy:
¬ Provides one million ingress and
one million egress buffers for
packet processing
¬Usestworandomearlydetection
(RED)slopesoneachqueueforvery
granular buffer-pool management
¬Offersthreelevelsofon-board
flexible buffer hierarchy: port-
class buffer pools, class pools and
root pools
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