參數(shù)資料
型號： MDS212CG
廠商： ZARLINK SEMICONDUCTOR INC
元件分類： 網(wǎng)絡(luò)接口
英文描述： 12-Port 10/100Mbps Ethernet Switch
中文描述： DATACOM, LAN SWITCHING CIRCUIT, PBGA456
封裝： 35 X 35 MM, 2.33 MM HEIGHT, MS-034, HSBGA-456
文件頁數(shù)： 61/111頁
文件大?。?/td> 1609K
代理商： MDS212CG
MDS212
Data Sheet
61
Zarlink Semiconductor Inc.
17.2.2 Blocking Multicast Packets Back To The Source Trunk
For local multicast packets, the Frame Engine needs to block the multicast packets from being sent to the same
Trunk Group as the receiving (source) port. To do it, the Search Engine utilizes the Trunk Group ID (TGID) in ECR1
Register.
The Frame Engine compares the TGID of the source and forwarding ports. If the two TGIDs are the same, the
Frame Engine blocks the forwarding port for this multicast packet. The Switch Engine provides the TGID of the
source port.
Example:
The following demonstrates the port trunking scheme for multicast packet forwarding.
4 Trunk Group in a switch:
Group 0: port 0,1,2 in device 0
Group 1: port 4, 5,6 in device 0
Group 2: port 1, 2,3 in device 1
Group 3: port 4, 5,6 in device 1
A multicast packet with VLAN INDEX=5 is received at port 0 of device 0.
The membership of this VLAN:
Device 0: port 0, 1, 2, 4, 5, 6, 7
Device 1: port 1, 2, 3, 4, 5, 6, 8
Hash Key = 3
Forwarding Port for each group with Hash Key=3,
Port 2 for Group 0
Port 4 for Group 1
Port 3 for Group 2
Port 6 for Group 3
Figure 23 - Multicast Packet Forwarding Example
0
0
1
1
1
0
0
1
1
1
1
1
1
1
1
0
1
1
1
1
0
0
0
0
0
0
1
0
1
0
0
1
0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
0
0
1
2
3
4
5
6
.......
11
7
A
N
D
Turn this port off
since port 2 has the
same TGID of source
port 0
Multicast packet received at port 0 of device 0
VLAN IDX=5, Hash Key=3
1
0
0
1
0
0
1
1
1
1
1
1
0
1
1
1
1
1
1
0
1
0
0
0
0
0
0
1
0
0
1
0
1
0
0
0
0
1
2
3
4
5
6
.......
11
7
Device 0
Local
Device 1
Remote
A
N
D
Forwarding Port Mask
for Key=3
VLAN Member
INDEX=5
for
Forwarding ports
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參數(shù)描述
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MDS217 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC
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