參數(shù)資料
型號: ZL50418GKC
廠商: Zarlink Semiconductor Inc.
英文描述: Managed 16-Port 10/100 M + 2-Port 1 G Ethernet Switch
中文描述: 管理16端口10/100平方米端口1個G以太網(wǎng)交換機(jī)
文件頁數(shù): 40/163頁
文件大小: 2122K
代理商: ZL50418GKC
ZL50418
Data Sheet
40
Zarlink Semiconductor Inc.
7.11 Mapping to IETF Diffserv Classes
The mapping between priority classes discussed in this chapter and elsewhere is shown below.
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 of Table 9 are merged in pairs—one class corresponding to NM+EF, two AF
classes and a single BE class.
Features of the ZL50418 that correspond to the requirements of their associated IETF classes are summarized in
the table below.
ZL
P7
P6
P5
P4
P3
P2
P1
P0
IETF
NM
EF
AF0
AF1
AF2
AF3
BE0
BE1
Table 10 - Mapping between ZL50418 and IETF Diffserv Classes for Gigabit Ports
ZL
P3
P2
P1
P0
IETF
NM+EF
AF0
AF1
BE0
Table 11 - Mapping between ZL50418 and IETF Diffserv Classes for 10/100 Ports
Network management (NM) and
Expedited forwarding (EF)
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
Assured forwarding (AF)
Four AF classes for 1 Gbps ports
Programmable 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 programmable levels
Global buffer reservation for each AF class
Best effort (BE)
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
Traffic from flow control enabled ports automatically classified
as BE
Table 12 - ZL50418 Features Enabling IETF Diffserv Standards
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