Cisco Systems 15327 Manual de usuario descargar pdf (Pagina 434)

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Ethernet Card Software Feature and Configuration Guide, R7.2

January 2009

Chapter 26 Configuring IEEE 802.17b Resilient Packet Ring

RPR-IEEE Features on the ML-Series Card

Note Throughout this book, Cisco proprietary RPR is referred to as Cisco proprietary RPR, and

IEEE 802.17b-based RPR is referred to as RPR-IEEE. This chapter covers RPR-IEEE. Chapter 17,

“Configuring Cisco Proprietary Resilient Packet Ring” covers Cisco Proprietary RPR.

RPR-IEEE Features on the ML-Series Card

See the “ML-Series Feature List” section on page 1-2 for a list of the ML-Series card’s supported and

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:

• 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.

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.

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