參數(shù)資料
型號： MVTX2803
廠商： Zarlink Semiconductor Inc.
英文描述： Unmanaged 8-Port 1000 Mbps Ethernet Switch
中文描述： 非托管8端口1000 Mbps以太網(wǎng)交換機(jī)
文件頁數(shù)： 26/127頁
文件大?。?/td> 1706K
代理商： MVTX2803
MVTX2803
Data Sheet
26
Zarlink Semiconductor Inc.
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
MVTX2803AG.
The MVTX2803AG 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 MVTX2803AG also provides a safe fail-over mode for port trunking automatically. If one of the ports in the
trunking group goes down, the MVTX2803AG 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.
The search engine retrieves the VLAN member ports from the VLAN index table, which consists of 4K entries.
The search engine retrieves the VLAN member ports from the ingress port’s VLAN map. Based on the
destination MAC address, the search engine determines the egress port from the MCT database. If the egress
port is a member of a trunk group, the packet can be distributed to the other members of that trunk group. The
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
Table 5 - MVTX2803AG Features Enabling IETF Diffserv Standards
相關(guān)PDF資料
PDF描述
MVTX2803AG Unmanaged 8-Port 1000 Mbps Ethernet Switch
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MVTX2804AG 8-Port 1000 Mbps Ethernet Distributed Switch
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MVTX2803A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Unmanaged 8 port Gigabit Ethernet switch
MVTX2803AG 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Unmanaged 8-Port 1000 Mbps Ethernet Switch
MVTX2803AG2 制造商:Microsemi Corporation 功能描述:
MVTX2804 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:8-Port 1000 Mbps Ethernet Distributed Switch
MVTX2804AG 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:8-Port 1000 Mbps Ethernet Distributed Switch
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