FBFM2112F897CSLJLS View Datasheet(PDF) - Intel

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FBFM2112F897CSLJLS

Intel® FM2112 24-Port 10G/1G Ethernet Switch Chip

Intel 

Intel® FM2112 24-Port 10G/1G Ethernet Switch Chip Data Sheet

3.3.1

Figure 9.

Congestion Management Architecture

Priority Mapping

{Described in registers Table 96 through Table 99, Table 161, and

Table 162}

Priority is used to separate traffic into different ordering domains, with

differentiated service for each ordering domain. There are 5 types of

priority classes in the Intel®Ethernet Switch Family: Ingress

(25*8=200), Switch (16), Egress (25*8=200), PWD (16) and Egress

Scheduling (4), related through mapping functions. Ingress priority is

the 3 bit VLAN priority tag that appears on all tagged frames. The

Egress Priority has no effect on the switch, it is simply the tag

presented to the outside network on each frame.

In addition, user defined triggers, see section 3.2.9, can establish a

switch priority based on any trigger rule. This is helpful for applications

in which using VLAN priority tagging is not the preferred way of

establishing priority.

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