Classb; Classc; Mqc -Ieee Rpr Cli Characteristics - Cisco ONS 15454 SDH Configuration Manual

Chapter 26 Configuring IEEE 802.17b Resilient Packet Ring
stations recognize the bandwidth allocation cumulatively. Reserved A0 bandwidth can be used only by
the station that reserves it. The default allocation is 0 Mbps. The unreserved classA bandwidth is called
the A1 bandwidth. Service class A1 is configured as high-priority traffic in excess of the A0 bandwidth
reservation, and can be rate-limited using the high tx-traffic rate limiter. The default allocation for A1 is
5 Mbps.

ClassB

This is the medium traffic priority. Lower priority than classA, but higher priority than classC. The medium
transmit traffic rate limiter allows a certain amount of traffic to be added to the ringlet that is not subject to
fairness eligibility, but must compete for the unreserved bandwidth with other traffic of the same service
class. This traffic is committed information rate (B-CIR) traffic. The default allocation is 10 Mbps.

ClassC

This is the lowest traffic priority. Class C cannot allocate any ring bandwidth guarantees

MQC -IEEE RPR CLI Characteristics

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IEEE-RPR classes are applicable to both front end and RPR-IEEE interfaces.
A MQC class in a policy map can be mapped to one of the RPR classes using "set rpr-ieee service
class". By default the MQC class maps to IEEE-RPR class C.
RPR classes B and C support Weighted Round Robin scheduling for multiple MQC classes mapping
to RPR class A and B. MQC classes mapped to RPR class A gets mapped to one stream, while each
MQC class mapped to RPR class B or C gets mapped to a seperate stream.
The "Bandwidth percent" action is supported for MQC classes mapping to RPR class B and C. The
bandwidth percent for these MQC classes defines the proportion of b/w these class B and C stream
will get, out of total b/w available to class B and C (whatever remains after class A traffic) . Both
these RPR classes allow 100% each. Trying to assign more than 100% will be rejected with an error .
The MQC class mapped to IEEE RPR class B or C with no explicit "bandwidth percent" configured
gets a default 7% bandwidth.
Bandwidth absolute/ percent action is not supported on rpr-ieee interfaces but only on Gig/Fast
Ethernet interfaces.
Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, R8.0
ClassB
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