參數(shù)資料
型號(hào): RTL8309SB
廠商: Electronic Theatre Controls, Inc.
英文描述: SINGLE-CHIP 9-PORT 10/100MBPS SWITCH CONTROLLER
中文描述: 單芯片9口10/100Mbps開(kāi)關(guān)控制器
文件頁(yè)數(shù): 101/115頁(yè)
文件大?。?/td> 866K
代理商: RTL8309SB
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RTL8309SB
Datasheet
Single-chip 9-port 10/100Mbps Switch Controller
86
Track ID: JATR-1076-21 Rev. 1.4
8.3.16. 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 non-convergence. Frames may be transmitted from Switch1 to
Switch2 via Link1, then returned to Switch1 via Link2.
Switch 1
Switch 2
Link2
Link1
Figure 15. Loop Example
When the loop detection function is enabled, the RTL8309SB periodically sends out a broadcast packet every 3~5 minutes and
automatically detects whether there is a network loop (or bridge loop). If a loop is detected the LoopLED# will be ON (active
low or high). The LED goes out when the network loop no longer exists. The Loop frame length is 64 bytes and its format is
shown below.
Table 112. Loop Frame Format
SID
8899
FFFF FFFF FFFF
0300 000…0000
CRC
In order to achieve loop detection, each switch device needs a unique SID (the source MAC address). If the EEPROM is not
used, a unique SID should be assigned via SMI after reset, and the default SID (0x52 54 4c83 09 b0) should not be used.
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