Nortel BCM 3.7, Manual

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