參數(shù)資料
型號： MVTX2602
廠商： Zarlink Semiconductor Inc.
英文描述： Managed 24 Port 10/100 Mbps Ethernet Switch
中文描述： 管理的24端口10/100 Mbps以太網(wǎng)交換機
文件頁數(shù)： 36/147頁
文件大小： 924K
代理商： MVTX2602
MVTX2602
Data Sheet
36
Zarlink Semiconductor Inc.
7.8 Buffer Management
Because the number of FDB slots is a scarce resource and because we want to ensure that one misbehaving
source port or class cannot harm the performance of a well-behaved source port or class, we introduce the concept
of buffer management into the MVTX2602. Our buffer management scheme is designed to divide the total buffer
space into numerous reserved regions and one shared pool, as shown in Figure 10 on page 37.
As shown in the figure, the FDB pool is divided into several parts. A reserved region for temporary frames stores
frames prior to receiving a switch response. Such a temporary region is necessary because when the frame first
enters the MVTX2602, its destination port and class are as yet unknown and so the decision to drop or not needs to
be temporarily postponed. This ensures that every frame can be received first before subjecting them to the frame
drop discipline after classifying.
Six reserved sections, one for each of the first six priority classes, ensure a programmable number of FDB slots per
class. The lowest two classes do not receive any buffer reservation. Furthermore, even for 10/100 Mbps ports, a
frame is stored in the region of the FDB corresponding to its class. As we have indicated, the eight classes use only
four transmission scheduling queues for 10/100 Mbps ports, but as far as buffer usage is concerned, there are still
eight distinguishable classes.
Another segment of the FDB reserves space for each of the 25 ports — 24 ports for Ethernet and one CPU port
(port number 24). One parameters can be set, one for the source port reservation for 10/100 Mbps ports and CPU
port. These 25 reserved regions make sure that no well-behaved source port can be blocked by another
misbehaving source port.
In addition there is a shared pool which can store any type of frame. The frame engine allocates the frames first in
the six priority sections. When the priority section is full or the packet has priority 1 or 0, the frame is allocated in the
shared poll. Once the shared poll is full the frames are allocated in the section reserved for the source port.
The following registers define the size of each section of the Frame data Buffer:
PR100- Port Reservation for 10/100 Ports
SFCB- Share FCB Size
C2RS- Class 2 Reserve Size
C3RS- Class 3 Reserve Size
C4RS- Class 4 Reserve Size
C5RS- Class 5 Reserve Size
C6RS- Class 6 Reserve Size
C7RS- Class 7 Reserve Size
相關PDF資料
PDF描述
MVTX2602AG Managed 24 Port 10/100 Mbps Ethernet Switch
MVTX2603 Unmanaged 24-Port 10/100 Mb + 2-Port 1 Gb Ethernet Switch
MVTX2603AG Unmanaged 24-Port 10/100 Mb + 2-Port 1 Gb Ethernet Switch
MVTX2604 Managed 24-Port 10/100 Mb + 2 Port 1 Gb Ethernet Switch
MVTX2604AG Managed 24-Port 10/100 Mb + 2 Port 1 Gb Ethernet Switch
相關代理商/技術參數(shù)
參數(shù)描述
MVTX2602A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MVTX260x Port Mirroring
MVTX2602AG 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Managed 24 Port 10/100 Mbps Ethernet Switch
MVTX2602AG2 制造商:Microsemi Corporation 功能描述:
MVTX2603 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Unmanaged 24-Port 10/100 Mb + 2-Port 1 Gb Ethernet Switch
MVTX2603A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Unmanaged 24 port 10/100Mb + 2 port 1Gb Ethernet switch
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