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22
C
ONFIGURING
Q
UALITY
OF
S
ERVICE
R
OUTING
22.1 Configuring QoS
Black Box QoS ensures bandwidth guarantees throughout the system by implementing Random Early Detection (RED) to
address congestion and Class Based Queuing (CBQ) to address traffic policing. This document discusses the CBQ features.
Black Box’s bandwidth management capability allows multiple agencies or customers to share access bandwidth on a
WAN link in a controlled fashion to effectively and efficiently utilize available bandwidth. Even during times of
congestion, each customer is guaranteed a share of the access bandwidth and is allowed to borrow unused bandwidth
from other customers. This bandwidth management capability allows service providers to offer their customers Internet
access based on the amount of guaranteed bandwidth-committed rate (CR) and the amount of bandwidth-borrowed
burst rate (BR). Similarly, an organization can share its access bandwidth among its different departments.
22.1.1Features
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 be deployed in both the WAN outbound and WAN inbound directions.
A traffic class is characterized by the following parameters:
Class name
Parent class
Committed rate (CR)
Burst rate (BR)
Classification type based on:
Application level
Application ports (TCP or UDP)
Network level
Source or destination IP addresses, address ranges, or subnets
Ethernet MAC level
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. There is no theoretical limit to the number of classes
that can be created. The only limitation that can arise is due to available memory in the Black Box system.