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參數(shù)資料
| 型號： | GT-48004A |
| 廠商： | Galileo Technology Services, LLC |
| 英文描述： | Four Port Switched Fast Ethernet Controller(四端口、交換式快速以太網控制器) |
| 中文描述： | 四端口交換式快速以太網控制器（四端口，交換式快速以太網控制器） |
| 文件頁數(shù)： | 65/106頁 |
| 文件大?。?/td> | 953K |
| 代理商： | GT-48004A |
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GT-48004A Four Port Switched Fast Ethernet Controller
61
Revision 1.0
N:\Marketing\Docs\Archive\48004A\DATASHEET\Rev 1.0\484ads10.fm
Tree algorithm itself is performed by a management CPU.
The GT-48004A includes a SpanEn bit in the Global Control register and additional SpanEn bits in each of the 8 Port
Control registers. Table 31 summarizes the hardware assistance for the Spanning Tree algorithm.
Note 1: The GT-48004A does not learn MAC addresses during the Spanning Tree ‘Learning’ stage (it is ‘learning’ the
bridge topology while in this mode.) The GT-48004A only learns MAC addresses in the Forward mode.
Note 2: The CPU can send BPDU messages to a port of the GT-48004A which is disabled. The mechanism to send
BPDUs from the CPU to a locked port is to send a BUFFER_REQUEST message like the format shown in Section
11.3.4, but with the LSB bits of the address as 0x58, instead of 0x0. This BUFFER_REQUEST message will cause the
GT-48001A to allocate a buffer regardless of the state of that port.
15.4
Broadcast Storm Filtering
Excessive broadcast packets (broadcast “storms”) can be filtered in a managed switch by setting the DisBroad bit in
the port control register. Broadcast packets can be re-enabled once the loops causing the broadcast storm are elimi-
nated via the spanning tree algorithm.
Table 31: Spanning Tree Enable Bit Definition
Sp a n En
( Gl oba l)
Sp anE n
(P or t)
L ogi c
St at e
Re m a rk s
0
x
Port Enable
No Spanning Tree. Treat BPDUs as regular Multicast.
1
Blocking,
Listening, Learning
Transfer BPDUs to CPU. All receive/transmit packets are
rejected, except BPDU messages from the CPU. Address
learning disabled.
1
0
Forward
Transfer BPDU to the CPU. Accept all packets. Address
learning enabled.
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