Cisco 15327 - Manual (Page 41)

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Ethernet Card Software Feature and Configuration Guide, R7.2
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 broadcast 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 nonoverlapping 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.