CHAPTER 10. QoS
170
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Features
The network administrator manages bundle bandwidth across various
customers by defining traffic classes. Each traffic class is assigned the desired
committed bandwidth as well as the burst bandwidth. The sum of the CRs of
all classes must be less than or equal to the total bundle bandwidth.
CBQ can only be used in the WAN outbound direction.
A traffic class is characterized by the following parameters:
y
Class name
y
Parent class
y
Committed rate(CR)
y
Peak rate(PR)
y
Classification type based on:
−
Application ports(TCP or UDP)
−
Network level
y
Source or destination IP addresses, address ranges, or subnets
−
Ethernet MAC
y
VLAN identifiers
Traffic classes are arranged in a hierarchical manner. A class has a parent
class and can have one or more child classes. The root class has no parent and
is identified as
root-out
or
root-in
. The only limit to the number of classes that
can be created is 1500 per interface.
Definitions
y
Committed Rate
Each traffic class can be assigned a CR parameter in Kbps. This is the
amount of bandwidth that the class or flow is guaranteed at all times, even
during congestion. The sum of the CRs for all classes in a given direction
cannot exceed the access bandwidth of their parent class. By maintaining a
moving average of the bandwidth for each class, the class is not ‘strictly’
policed at CR Kbps, and momentary peaks in the flow are permitted.
The goal is that each class with sufficient demand will be able to receive
roughly its allocated bandwidth over some interval of time.
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