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Ethernet Card Software Feature and Configuration Guide, R7.2
January 2009
Chapter 1 ML-Series Card Overview
ML-Series Feature List
RPR-IEEE service qualities supported:
Per-service-quality flow-control protocols regulate traffic introduced by clients.
Class A allocated or guaranteed bandwidth has low circumference-independent jitter.
Class B allocated or guaranteed bandwidth has bounded circumference-dependent jitter. This
class allows for transmissions of excess information rate (EIR) bandwidths (with class C
properties).
Class C provides best-effort services.
RPR-IEEE design strategies increase effective bandwidths beyond those of a broadca st ring:
Clockwise and counterclockwise transmissions can be concurrent.
Bandwidths can be reallocated on nonoverlapping segments.
Bandwidth reclamation. Unused bandwidths can be reclaimed by opportunistic services.
Spatial bandwidth reuse. Opportunistic bandwidths are reused on no noverlapping segments.
Temporal bandwidth reuse. Unused opportunistic bandwidth can be consumed by others.
RPR-IEEE fairness features ensure proper partitioning of opportunistic traffic:
Weighted fairness allows a weighted fair access to available ring capacity.
Aggressive fairness is supported.
Single Choke Fairness Supports generation, termination, and processing of Single Choke
Fairness frames on both spans.
RPR-IEEE plug-and-play automatic topology discovery and advertisement of station capabilities
allow systems to become operational without manual intervention.
RPR-IEEE multiple features support robust frame transmissions:
Service restoration time is less than 60 milliseconds after a station or link failure.
Queue and shaper specifications avoid frame loss in normal operation.
Fully distributed control architecture eliminates single points of failure.
Operations, administration, and maintenance support service provider environments.
RPR-IEEE non-supported features:
EoMPLS is not supported.
IP forwarding is not supported.
Wrapping, the optional IEEE 802.17b protection scheme, is not supported. Steering, the
protection scheme mandated by the standard, is supported.
Layer 3 routing is not supported.