参数资料
型号: IP178CHLF
厂商: Electronic Theatre Controls, Inc.
英文描述: 8 Port 10/100 Ethernet Integrated Switch
中文描述: 8端口10/100以太网集成开关
文件页数: 42/91页
文件大小: 1244K
代理商: IP178CHLF
IP178C
Preliminary Data Sheet
2.10
Copyright
2004, IC Plus Corp.
42/91
October 27, 2005
IP178C-DS-R09
Spanning tree
IP178C supports spanning tree function with the following features:
1. Detect BPDU frames by examining multicast address (01-80-c2-00-00-00).
2. Forward BPDU packets to CPU through MII and add special tag for source port information.
Forward BPDU packets from CPU according to the special tag in a frame.
Please refer to section “Tag VLAN / Tag and un-tag function”.
Port states
To support spanning tree protocol, each port of IP178C provides five port states shown in the following
table. Port 0~7 of IP178C can be configured in one of the five spanning tree states individually by
programming MII register 31.13 to enable (disable) forwarding and learning function. Port 8 (MII) is
dedicated for CPU.
Fwd BPDU
packet to CPU
from CPU
Disable
X (note 2)
X (note 2)
Blocking
O
X (note 3)
Listening
O
O
Learning
O
O
Forwarding
O
O
State
Fwd BPDU packet
Address
learning
X
X
X
O
O
Fwd all packet
normally
X
X
X
X
O
(Forward enable,
Learning enable)
(0,0)
(0,0)
(0,0)
(0,1)
(1,1)
Note1:
O: enabled, X: disabled
Note2:
CPU should not send packets to IP178C and should discard packets from IP178C.
Note3:
CPU should not send packets to IP178C.
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