參數(shù)資料
型號(hào): MVTX2804AG
廠商: ZARLINK SEMICONDUCTOR INC
元件分類: 網(wǎng)絡(luò)接口
英文描述: 8-Port 1000 Mbps Ethernet Distributed Switch
中文描述: DATACOM, LAN SWITCHING CIRCUIT, PBGA596
封裝: 40 X 40 MM, 2.33 MM HEIGHT, MS-034, HSBGA-596
文件頁數(shù): 35/174頁
文件大?。?/td> 2249K
代理商: MVTX2804AG
MVTX2804
Data Sheet
35
Zarlink Semiconductor Inc.
Features of the MVTX2804 that correspond to the requirements of their associated IETF classes are
summarized in the table below.
8.0 Port Trunking
8.1 Features and Restrictions
A port group (i.e. trunk) can include up to 8 physical ports, but all of the ports in a group must be in the same
MVTX2804.
In managed mode, there are four trunk groups total.
In unmanaged mode, the MVTX2804 provides several pre-assigned trunk group options, containing as many as
4 ports per group, or alternatively, as many as 4 total groups.
Load distribution among the ports in a trunk for unicast is performed using hashing based on source MAC
address and destination MAC address. The other options include source MAC address only, destination MAC
address only. Load distribution for multicast is performed similarly.
If a VLAN includes any of the ports in a trunk group, all the ports in that trunk group should be in the same VLAN
member map.
The MVTX2804 also provides a safe fail-over mode for port trunking automatically. If one of the ports in the
trunking group goes down, the MVTX2804 will automatically redistribute the traffic over to the remaining ports in
the trunk in unmanaged mode. In managed mode, the software can perform similar tasks.
8.2 Unicast Packet Forwarding
The search engine finds the destination MCT entry, and if the status field says that the destination address
found belongs to a trunk, then the group number is retrieved instead of the port number. In addition, if the
source address belongs to a trunk, then the source port's trunk membership register is checked to determine if
the address has moved.
A hash key is used to determine the appropriate forwarding port, based on some combination of the source and
destination MAC addresses for the current packet.
Network management (NM)
and Expedited forwarding (EF)
Global buffer reservation for NM and EF
Shaper for EF traffic
Option of strict priority scheduling
No dropping if admission controlled
Assured forwarding (AF)
Four AF classes
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
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
Figure 6 - MVTX2804 Features Enabling IETF Diffserv Standards
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