參數(shù)資料
型號： GT-48207
廠商： Galileo Technology Services, LLC
英文描述： Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高級交換式 10+10/100 BaseX以太網(wǎng)控制器)
中文描述： 先進的交換式以太網(wǎng)控制器的10 10/100 BaseX（高級交換式10 10/100 BaseX以太網(wǎng)控制器）
文件頁數(shù)： 82/135頁
文件大小： 1619K
代理商： GT-48207
GT-482xx Switched Ethernet Controllers for 10+10/100 BaseX
GALI
LEO
TECHNOLOGY
CONFI
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REPRODUCE
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Revision 1.2
When Monitoring is implemented in a multi-device configuration and connected together through the expansion
port, the user cannot set the source sniffer and the target sniffer in the different devices. This requires using the
expansion port as target sniffer in the source device, and as source sniffer in the target device and will cause unre-
lated traffic between the devices to be forwarded to the target-sniffer port on the other device.
For such configuration the recommended operation should be one of the following:
a) Designate the CPU as the target sniffer,
or
b) Restrict the source and the target sniffer port to reside in the same device
11.3
Spanning Tree (BPDU) Support
The GT-482xx provides hardware assistance for the Bridge Spanning Tree Algorithm. The Spanning Tree algo-
rithm itself is performed by a management CPU.
The GT-482xx includes a SpanEn bit in the Global Control register and additional SpanEn bits in each of the 14
Port Control registers. Table 12 summarizes the hardware assistance for the Spanning Tree algorithm.
Note: The GT-482xx does not learn MAC addresses during the Spanning Tree ‘Learning’ stage (it is ‘learning’ the
bridge topology while in this mode.) The GT-482xx only learns MAC addresses in the Forward mode.
11.4
Broadcast Storm Filtering
Excessive Broadcast packets (Broadcast “storms”) can be filtered in a managed switch by setting the FilBroad bit
in the Port Control register. In this mode, the inbound Broadcast packets will be discarded. Broadcast packets can
be re-enabled once the loops causing the Broadcast storm are eliminated via the spanning tree algorithm.
Table 12: Spanning Tree Enable Bit Definition
Sp a nE n
(G loba l)
Spa n En
(Po r t)
Logic
S tat e
R emar ks
0
x
Port Enable
No Spanning Tree. Treat BPDU as regular Multicast
1
Blocking,
Listening,
Learning
Transfer BPDUs to CPU.
All receive/transmit packets should be rejected.
Accept BPDU messages from the CPU.
No address learning
1
0
Forward
Transfer BPDU to the CPU. Accept all packets.
Address learning
相關PDF資料
PDF描述
GT-48208 Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高級交換式 10+10/100 BaseX以太網(wǎng)控制器)
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