Ip Service Classes; Table 242 Service Classes - Nortel BCM 3.7 Manual

798 Policy configuration overview

IP service classes

Business Communications Manager supports the following services classes:
• Critical and Network classes have the highest priority over all other traffic.
• Premium class is an end-to-end service functioning similarly to a virtual leased line. Traffic in
this service class is guaranteed an agreed upon peak bandwidth. Traffic requiring this service
should be shaped at the network boundary in order to undergo a negligible delay and delay
variance. This service class is suitable for real time applications like video and voice over IP.
The recommended PHB for this service is the Expedited Forwarding (EF) PHB.
• Platinum, Gold, Silver, and Bronze classes use the Assured Forwarding PHB. These classes
are used for real time, delay tolerant traffic and non real time, mission critical traffic.
• Best Effort (standard) class is the standard Internet packet service with an additional, optional
use of traffic profiling that is used at the network boundary to 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).
The following table describes the service classes and the required treatment. The following table
shows how the service classes are mapped to the Business Communications Manager queues.

Table 242 Service classes

Traffic category
Critical Network Control
Standard Network
Control
Real time, delay
intolerant, fixed
bandwidth
Real time, delay tolerant,
low variable bandwidth
Real time, delay tolerant,
high variable bandwidth
Non-real time, mission
critical, interactive
Non-real time, mission
critical, non-interactive
Non-real time,
non-mission critical
N0008589 3.3
Service class Application type
Critical Critical network control traffic
Network Standard network control traffic
Premium Person to person
communications requiring
interaction (such as VoIP).
Platinum Person to person
communications requiring
interaction with additional minimal
delay (such as low cost VoIP).
Gold Single human communication
with no interaction (such as Web
site streaming video).
Silver Transaction processing (such as
Telnet, Web browsing).
Bronze For example, E-mail, FTP, SNMP. Lower-priority scheduling providing
Standard Bulk transfer (such as large FTP
transfers, after-hours tape
backup).
Required treatment
Highest priority over all other traffic.
Guaranteed minimum bandwidth.
Priority over user traffic. Guaranteed
minimum bandwidth
Absolute bounded priority over user
traffic. No packet loss for in-profile
traffic. Virtual leased line with lowest
amount of latency. Provisioned for
peak rate.
Higher-priority scheduling providing
guaranteed minimum provisioned
bandwidth. Competes for additional
bandwidth.
High-priority scheduling providing
guaranteed minimum provisioned
bandwidth. Competes for additional
bandwidth.
Medium priority scheduling providing
guaranteed minimum provisioned
bandwidth. Competes for additional
bandwidth.
guaranteed minimum provisioned
bandwidth. Competes for additional
bandwidth.
Best effort delivery. Uses remaining
available bandwidth.