26-18
Ethernet Card Software Feature and Configuration Guide, R7.2
January 2009
Chapter 26 Configuring IEEE 802.17b Resilient Packet Ring
ClassC
ClassC
This is the lowest traffic priority. Class C cannot allocate any ring bandwidth guarantees
MQC -IEEE RPR CLI Characteristics
• 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.
Configuring Traffic Rates for Transmission
To enable and configure the traffic rates, perform the following procedure, beginning in global
configuration mode:
Command Purpose
Step 1 Router(config)# interface rpr-ieee 0 Activates interface configuration mode to
configure the RPR-IEEE interface.
Step 2 Router(config-if)# rpr-ieee tx-traffic
rate-limit {reserved | high | medium} rate
[east | west]
Specifies a rate limit on a traffic queue. The
allowable rate depends on the speed of the
interface.
reserved—Reserves bandwidth for the highes t
priority traffic, known as service class A0. The
default allocation is 0 Mbps.
high—Limits the rate of service class A1. The
default allocation is 10 Mbps.
medium—Limits the rate of service class B-CIR.
The default allocation is 10 Mbps.
(Optional) Specify the east or west ringlet.
Step 3 Router(config)# no shut Enables the RPR-IEEE interface and changes the
mode from the default passthrough.