Cisco 10000 Series User Manual

15-33
Cisco 10000 Series Router Quality of Service Configuration Guide
OL-7433-09
Chapter 15 Oversubscribing Physical and Virtual Links
Configuring VC Weighting
Configuration Example for Configuring VC Weighting on a Subinterface Using Bandwidth Remaining
Ratio
The following example shows how to differentiate one ATM PVC from another during congestion by
using bandwidth-remaining ratios. In the example, during periods of congestion in which the traffic on
all PVCs on the interface exceeds the interface speed, the router uses the configured
bandwidth-remaining ratio of 10 to determine the amount of excess (unused by priority traffic)
bandwidth to allocate to non-priority traffic on PVC 0/200, relative to the other ATM PVCs configured
on the interface.
policy-map Child
class precedence_0
bandwidth 100
class precedence_1
bandwidth 10000
!
policy-map Parent
class class-default
bandwidth remaining ratio 10
service-policy Child
!
interface ATM2/0/3.200 point-to-point
ip address 10.20.1.1 255.255.255.0
pvc 0/200
Step 13
Router(config)# interface type
slot/module/port.subinterface [point-to-point |
multipoint]
Creates or modifies the interface you specify. Enters
subinterface configuration mode.
type is the interface type (for example, Gigabit Ethernet).
slot/module/port.subinterface is the number of the
subinterface that identifies the subinterface (for example,
1/0/0.1).
(Optional) point-to-point indicates that the subinterface is
a point-to-point subinterface.
(Optional) multipoint indicates that the subinterface is a
point-to-multipoint subinterface.
Step 14
Router(config-if)# service-policy {input |
output} parent-policy-name
Applies the parent policy to the subinterface.
input indicates to apply the service policy to inbound
traffic.
output indicates to apply the service policy to outbound
traffic.
parent-policy-name is the name of the parent policy map.
The router shapes the subinterface traffic to the shaping rate
specified in the parent class-default class and applies the
QoS actions specified in the child policy to traffic matching
the traffic classes.
During periods of congestion, the router uses the
bandwidth-remaining ratio specified in the parent policy
map to allocate unused bandwidth on this subinterface
relative to other subinterfaces.
Command or Action Purpose

Cisco 10000 Series Specifications

General

Brand	Cisco
Model	10000 Series
Category	Network Router
Language	English