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參數(shù)資料
| 型號： | RTL8305SB |
| 英文描述： | RTL8305SB |
| 中文描述： | RTL8305SB |
| 文件頁數(shù)： | 48/66頁 |
| 文件大?。?/td> | 963K |
| 代理商： | RTL8305SB |
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RTL8305SB
2002/04/09
48
Rev.1.0
7.3.13 Loop Detection
Loops should be avoided between switch applications. The simplest loop as shown below results in: 1) Unicast frame
duplication; 2) Broadcast frame multiplication; 3) Address table nonconvergence. Frame may be transmitted from Switch1 to
Switch2 via Link1, then return to Switch1 via Link2.
S w i t c h 1
S w i t c h 2
L i n k 2
L i n k 1
Figure 2: Example of Loop
When the loop detection function is enabled by setting DisLoop=0 in EEPROM or an internal register, the RTL8305SB
periodically sends out a broadcast 64-byte packet every 3~5 minutes and automatically detect whether if there is a network loop
(or bridge loop) existence. The LoopLED# will be ON (active low or high) to indicate that a loop exits. The LED goes out by
unplugging both of the RTL8305SB ports of the loop. The Loop frame length is 64 bytes and its format as shown below.
Table 7: Loop frame format
FFFF FFFF FFFF SID
8899 0300 000…0000
CRC
In order to achieve loop detection, each switch device needs different SID (Source MAC address Identifier) for detection. So
that, the different EtherID is needed for each device when the loop detection function is enabled. If the EEPROM is not used, a
unique EtherID via SMI should be assigned after reset and the default EtherID (0x5254 4c83 05b0) should not be used.
Ethernet MAC address byte (bit) ordering: For example, MAC address is 52 54 4c 00 01 02. According to 802.3, 0x52 is byte
0, 0x54 is byte 1, 0x02 is byte 5,
Byte 0 Byte 1 Byte 2 Byte 3 Byte 4 Byte 5
Bytes --- 52 54 4c 00 01 02
Bits --- 0101 0010 0101 0100 0100 1100 0000 0000 0000 0001 0000 0010
Bit7 Bit0 Bit15 Bit8 ……………. Bit47 Bit40
The order of bit transmission is low-order bit first. From bit0 to bit47:
0100 1010 0010 1010 0011 0010 0000 0000 1000 0000 0010 0000
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RTL8305SC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:用于100M網(wǎng)絡(luò)交換 |
| RTL8305SC-LF | 制造商:Realtek Semiconductor 功能描述: |
| RTL8308B | 制造商:Realtek Semiconductor 功能描述:8-PORT 10/100 ETHERNET SWITCH CONTROLLER WITH EMBEDDED MEMORY, PQFP128 |
| RTL8309SB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SINGLE-CHIP 9-PORT 10/100MBPS SWITCH CONTROLLER |
| RTL8309SB-LF | 制造商:Realtek Semiconductor 功能描述:RTL8309 Series 9 Port 10/100 Mbps Ethernet Switch Controller - PQFP-128 制造商:Realtek 功能描述:RTL8309 Series 9 Port 10/100 Mbps Ethernet Switch Controller - PQFP-128 |
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