Forwarding Classes; Table 18: Forwarding Classes - Alcatel-Lucent 7210 SAS E OS Quality Of Service Manual

Forwarding Classes

7210 SAS devices support multiple forwarding classes and class-based queuing, so the concept of
forwarding classes is common to all of the QoS policies.
Each forwarding class (also called Class of Service (CoS)) is important only in relation to the other
forwarding classes. A forwarding class provides network elements a method to weigh the relative
importance of one packet over another in a different forwarding class.
Queues are created for a specific forwarding class to determine the manner in which the queue
output is scheduled. The forwarding class of the packet, along with the in-profile or out-of-profile
state, determines how the packet is queued and handled (the per hop behavior (PHB)) at each hop
along its path to a destination egress point. 7210 SAS devices support eight (8) forwarding classes
(Table

Table 18: Forwarding Classes

FC-ID
7
6
5
4
3
2
1
0
Note that
behavior, in terms of ingress marking interpretation and egress marking, can be changed by a
Network QoS Policies on page
and out-of-profile.
7210 SAS-E OS Quality of Service Guide
18).
FC Name
Designa-
tion
Network NC
Control
High-1
Expedited
High-2
Low-1
Assured
Low-2
Best Effort
Table 18 presents the default definitions for the forwarding classes. The forwarding class
FC DiffServ
Name
NC2
H1 NC1
EF EF
H2 AF4
L1 AF2
AF AF1
L2 CS1
BE BE
21. All forwarding class queues support the concept of in-profile
Notes
Intended for network control traffic.
Intended for a second network control
class or delay/jitter sensitive traffic.
Intended for delay/jitter sensitive traffic.
Intended for delay/jitter sensitive traffic.
Intended for assured traffic. Also is the
default priority for network management
traffic.
Intended for assured traffic.
Intended for BE traffic.
QoS Policies
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