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AL10051N3DL 参数 Datasheet PDF下载

AL10051N3DL图片预览
型号: AL10051N3DL
PDF下载: 下载PDF文件 查看货源
内容描述: 薄膜片式电感器 [THIN FILM CHIP INDUCTOR]
分类和应用: 电感器
文件页数/大小: 66 页 / 368 K
品牌: ABC [ ABC Taiwan Electronics Corp ]
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AL103 Revision 1.0  
3.7 Port Aggregation (Trunking)  
The AL103 supports trunking/port aggregation. Port aggregation and trunking is essentially a  
method to treat multiple physical links as a single logical link. The benefit of trunking is the ability  
to group multiple lower speed links into one higher speed link. For example, four full-duplex 100  
Mbps links can be used as one single 800-Mbps link. This is very useful for switch to switch,  
switch to server, and switch to router applications.  
The AL103 considers a trunk as a single port entity regardless of the trunk composition. Two to  
four ports can be grouped together as a single trunk link. The grouping of the ports in the trunk  
must be from the top four ports or the bottom four ports of the device, i.e. port 0 to 3 or port 4 to 7.  
In a multiple link trunk, the links within the trunk should have a balanced amount of traffic in order  
to achieve maximum efficiency. One of the requirements for transmission is that the frames being  
transmitted must be in order. Therefore, some sort of load balancing among the links of the trunk  
must be deployed. The AL103 offers two methods of load balancing which can be selected in the  
System Configuration Register I (register 00).  
3.7.1 Load Balancing  
The two load-balancing methods that AL103 uses to support trunking are port based and MAC  
address based. Port based load balancing method is an explicit port assignment scheme. It requires  
each individual port be assigned to a specific link (trunk port) in the trunk. If the port is not  
assigned, the frame might be routed to the trunk randomly which may cause the frames to go out of  
order. The port based load balancing trunk can be assigned as a 2-, 3-, or 4-port trunk.  
During transmission of the frame, it will be routed from the source port to the assigned trunk port.  
When a frame is received from any one of the trunk ports, it will be routed to the destination port  
within the VLAN. In essence, the AL103 treats a trunk as any single port within the same VLAN. If  
the ports traffic is evenly distributed among all the trunk ports, load balancing is achieved and the  
aggregate bandwidth of the trunk can be as high as 800 Mbit/s (full-duplex).  
The alternative is the MAC address based load balancing. When the AL103 receives a frame with a  
trunk destination, it will automatically forward the frame to a port in the trunk based on the source,  
destination, or the combination of the source and destination MAC address. The MAC address load  
balancing decision is based on a proprietary algorithm. The MAC address based load-balancing  
trunk also can be assigned as a 2-, 3-, or 4-port trunk.  
3.7.2 Trunk Fail Over  
If a link is lost in one of the trunk ports, frame loss will occur. The trunk fail-over feature in the  
AL103 can prevent frame loss caused by link failure in a trunk port. When the trunk fail-over option  
is enabled in register 2D, bit 9 (L2Fail), the AL103 will automatically shift the load from the port  
with the lost link to the next available port. This option is available for MAC address based loading  
trunk only. Once the port with a lost link recovers and links up, the AL103 will return to the original  
trunk setting.  
9/00  
Reference Only / Allayer Communications  
21  
 
 
 
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