Nortel 4526T-PWR 用户指南
20
Chapter 1 An Introduction to Policy-Enabled Networks
request a better effort treatment for packets that are in-profile (packets
that do not break the service agreements between the user and the
service provider).
that do not break the service agreements between the user and the
service provider).
describes the service classes and their
required treatment.
Service Classes
Traffic category
Service class
Application type
Required treatment
Real-time,
delay-intolerant,
fixed bandwidth
delay-intolerant,
fixed bandwidth
Premium
Real-time applications
such as video and Voice
over IP (VoIP).
such as video and Voice
over IP (VoIP).
Expedited Forwarding
(EF) - end-to-end function
similar to a virtual leased
line. Guaranteed agreed
peak bandwidth and 100%
priority.
(EF) - end-to-end function
similar to a virtual leased
line. Guaranteed agreed
peak bandwidth and 100%
priority.
Critical and
standard network
control
standard network
control
Critical and Network
Critical and standard
network control traffic.
network control traffic.
Weighted Round Robin -
65% proportion
65% proportion
Real-time,
delay-tolerant
traffic and
non-real-time,
mission-critical
traffic
delay-tolerant
traffic and
non-real-time,
mission-critical
traffic
Platinum, Gold,
Silver, and Bronze
Silver, and Bronze
Communications
requiring interaction
with additional minimal
delay (such as low-cost
VoIP). Single human
communication with no
interaction (such as web
site streaming video).
Transaction processing
(such as Telnet, web
browsing), and. e-mail,
FTP, SNMP.
requiring interaction
with additional minimal
delay (such as low-cost
VoIP). Single human
communication with no
interaction (such as web
site streaming video).
Transaction processing
(such as Telnet, web
browsing), and. e-mail,
FTP, SNMP.
Assured Forwarding (AF)
Non-real time,
non-mission-critical
non-mission-critical
Standard
Bulk transfer (such as
large FTP transfers,
after-hours tape backup).
large FTP transfers,
after-hours tape backup).
Best-effort delivery. Uses
remaining available
bandwidth. Optional use of
traffic classification at the
network boundary requests
better effort treatment for
in-profile packets.
remaining available
bandwidth. Optional use of
traffic classification at the
network boundary requests
better effort treatment for
in-profile packets.
Specifying interface groups
Interface groups are used in the creation of role-based policies. Role-based
policies differ from port-based policies in the fact that role-based policies
group ports together to apply a common set of rules to them. Alternatively,
port-based polices are used to apply rules to one port only.
policies differ from port-based policies in the fact that role-based policies
group ports together to apply a common set of rules to them. Alternatively,
port-based polices are used to apply rules to one port only.
Nortel Ethernet Routing Switch 4500 Series
Configuration — Quality of Service
NN47205-504 (322816-
B
)
03.01
Standard
5.1
23 November 2007
Copyright © 2007, Nortel Networks
.