Rpr-Ieee Features On The Ml-Series Card; Advantages Of Rpr-Ieee; Role Of Sonet/Sdh Circuits - Cisco ONS 15454 SDH Configuration Manual

RPR-IEEE Features on the ML-Series Card

RPR-IEEE Features on the ML-Series Card
See the
non-supported features based on the expected IEEE 802.17b.

Advantages of RPR-IEEE

In Software Release 7.2 and later, the ML-Series card supports RPR-IEEE in addition to Cisco
proprietary RPR. Some of the advantages of RPR-IEEE include:
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Role of SONET/SDH Circuits

The ML-Series cards in an RPR-IEEE must connect directly or indirectly through point-to-point
synchronous transport signal/synchronous transport module (STS/STM) circuits. The point-to-point
STS/STM circuits are configured on the ONS node through Cisco Transport Controller (CTC) or
Transaction Language One (TL1) and are transported over the ONS node's SONET/SDH topology on
either protected or unprotected circuits.
On circuits unprotected by the SONET/SDH mechanism, RPR-IEEE provides resiliency without using
the capacity of the redundant protection path that a SONET/SDH protected circuit would require. This
frees this capacity for additional traffic. RPR-IEEE also utilizes the bandwidth of the entire ring and does
not block segments like STP or RSTP.
Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, R8.0
26-2
"ML-Series Feature List" section on page 1-2
Steering. Ring protection is accomplished through steering instead of wrapping. Steering is a more
efficient way of routing around a failure.
Dual-transit queues. Dual-transit queues offer more control in handling transit traffic.
Best-effort traffic classifications. "Best Effort" and "EIR" traffic classifications improve
distribution of traffic across a best-effort service class.
Interoperability. Conformance to the expected IEEE 802.17b standard increases interoperability
with third-party vendors.
Built-in service provider support. RPR-IEEE provides built-in operations, administration, and
maintenance (OAM) support for service provider environments.
Fairness. Fairness allows all the stations on the ring to fairly share the RPR-IEEE's best-effort
bandwidth.
Chapter 26 Configuring IEEE 802.17b Resilient Packet Ring
for a list of the ML-Series card's supported and