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Port Trunking and Load Balancing in Blade Switches 
For example: There is a port trunk group with eight member ports, and there is a frame with 
SA=0x0080C800000B DA=0x0080C800000C. 
• 
• 
• 
• 
• 
• 
SA last three bits is 0b011 
DA last three bits is 0b100 
SA XOR DA is 0b111 
In the following example, four trunk ports are link up in the port trunk. 
For algorithm 1, N = 0b011 MOD 4 = 3    
The outgoing port would be the fourth link up in the port trunk. 
For algorithm 2, N = 0b100 MOD 4 = 0    
The outgoing port would be the first link up in the port trunk. 
For algorithm 3, N = 0b111 MOD 4 = 3    
The outgoing port would be the fourth link up in the port trunk. 
The following table shows the relationship between the remainder and outgoing ports 
 
Link up port 
 
1
st
 
2
nd
 
3
rd
 
4
th
 
5
th
 
6
th
 
7
th
 
8
th
 
Last three LSB 
0b000 0b001 
0b010 
0b011 
X X X  X 
Last three LSB 
0b100 0b101 
0b110  0b111 X 
In the following example, 6 trunk ports are link up in the port trunk. 
• 
• 
• 
For algorithm 1, N = 0b011 MOD 6 = 3    
The outgoing port would be the fourth link up in the port trunk. 
For algorithm 2, N = 0b100 MOD 6 = 4    
The outgoing port would be the fifth link up in the port trunk. 
For algorithm 3, N = 0b111 MOD 6 = 1    
The outgoing port would be the second link up in the port trunk. 
The following table shows the relationship between the remainder and outgoing ports. 
 
Link up port 
 
1
st
 
2
nd
 
3
rd
 
4
th
 
5
th
 
6
th
 
7
th
 
8
th
 
Last three LSB 
0b000 0b001 0b010 
0b011  0b100 0b101 X 
Last three LSB 
0b110 
0b111 
X X  X X X X 
 
HP ProLiant BL e-Class C-GbE Interconnect Switch User Guide 
G-5 
  
 
HP CONFIDENTIAL Codename: DeLorean Part Number: 263682-002 Last Saved On: 2/5/03 10:51 AM