Mapping To Ietf Diffserv Classes - Planet WGSW-404 User Manual

5.15.1.10 Mapping to IETF Diffserv Classes

The mapping between priority classes discussed in this chapter and elsewhere is shown below.
T 5-6 M
ABLE
Gigabit Port P7
Megabit Port P3
IETF NM
As the table illustrates, P7 is used solely for network management (NM) frames. P6 is used for
expedited forwarding service (EF). Classes P2 through P5 correspond to an assured forwarding (AF)
group of size 4.
Finally, P0 and P1 are two best effort (BE) classes.
For 10/100 Mbps ports, the classes are merged in pairs—one class corresponding to NM+EF, two AF
classes, and a single BE class.
Features of the Switch that correspond to the requirements of their associated IETF classes are
summarized as the following.
Network management (NM)
and Expedited forwarding
(EF)
Assured forwarding (AF)
Best effort (BE)
B
APPING ETWEEN THE
P6 P5
P2
EF AF0
Global buffer reservation for NM and EF
Shaper for EF traffic on 1 Gbps ports
Option of strict priority scheduling
No dropping if admission controlled
Four AF classes for 1 Gbps ports
Configurable bandwidth partition, with option of WFQ
service.
Option of delay-bounded service keeps delay under
fixed levels even if not admission-controlled.
Random early discard, with configurable levels
Global buffer reservation for each AF class
Two BE classes for 1 Gbps ports
Service only when other queues are idle means that
QoS not adversely affected
Random early discard, with programmable levels
S IETF D
WITCH AND
P4 P3 P2
P1
AF1 AF2 AF3
- 156 -
C
IFFSERV LASSES
P1 P0
P0
BE0 BE1