Packet Classifiers; Table 243 Default Queue Mapping For Business Communications Manager - Nortel BCM 3.7 Manual

These Required treatments (or service class behaviors) for these Service classes are implemented
using nine queues and a scheduler for these queues. Queue 1 has the highest priority, referred to as
Strict Priority. Queues 2 to 9 are scheduled according to a Weighted Fair Queuing (WFQ) scheme.
The following table summarizes the mappings between service classes, queues and DSCP codes.

Table 243 Default Queue mapping for Business Communications Manager

NNSC
Premium
Network
Platinum
Gold
Silver
Bronze
Standard
Standby
N/A

Packet classifiers

Filters are organized in groups. A filter group is an ordered list of filters. Each group of filters is
associated with actions that are executed when the packet matches the first filter in the group. The
filter group and the associated actions constitute a policy. A classifier is an ordered list of policies.
Filters can be added or deleted from an existing group.
The order of a filter group in a classifier is called the group precedence. The lower the order of a
group in a classifier the higher the precedence. The order in which filters in a given classifier are
evaluated depends on the precedence of the filter group in which the filter resides and, on the order
of the filter in the group. Filters in the higher-precedence groups are evaluated before filters in the
lower-precedence groups.
A classifier is associated with a role combination. Packets received from any port that has the same
role combination are classified with the same classifier. The Policy Table in Unified Manager
defines the policies of the classifier associated with a given role combination.
IP filters
IP filters are used to classify IP traffic based on the following criteria:
• Layer 3 information, including IP source and subnet addresses, IP destination and subnet
addresses, DSCP, and IP protocols such as TCP/UDP
• Layer 4 information, including TCP/UDP port numbers
Business Communications Manager can use 31 IP filters.
Default DSCP
40, 46
48, 56
34, 36, 38
26, 28, 30
18, 20, 22
10, 12, 14
0
2
N/A
Policy configuration overview
Business
Communications
Manager Queue
1
2
3
4
5
6
7
8
9 (unused)
Programming Operations Guide
799
Business
Communications
Manager Scheduler
Strict Priority
Weighted Fair Queuing
Weighted Fair Queuing
Weighted Fair Queuing
Weighted Fair Queuing
Weighted Fair Queuing
Weighted Fair Queuing
Weighted Fair Queuing
Weighted Fair Queuing