ZyXEL Communications PES-1014 - Manual (Page 44)

PES-1014 User’s Guide
6-4 Trunk
The designated two bits of the SA and DA are Exclusive Or’d (XOR).
Table 6-1 Exclusive Or
BINARY BIT PAIR XOR RESULT
[0, 0] 0
[0, 1] 1
[1, 0] 1
[1, 1] 0
These combinations map to trunk ports as shown next. The left value represents SA and the right represents DA.
Table 6-2 Bit Selection Port Assignment
XOR RESULT
PAIR
PORT FORWARDED TO
[1, 1] trunk port 1
[1, 0] trunk port 2
[0, 1] trunk port 3
[0, 0] trunk port 4
MAC Address Based Mode Bit Selection Example
Select Trunk 2 from Trunk Assignment and [0,1] MAC Address Based Mode Bit Selection in the MAC-based
Mode Trunk Configuration screen.
The following two packets are forwarded as follows:
Table 6-3 MAC Address Based Mode Bit Selection Example
PACKET SA DA PORT FORWARDED TO
Packet 1 00:C0:A7:98:FE:81
1
00:C0:A7:98:FE:9B
2
Port 4 (trunk port 2).
Packet 2 00:C0:A7:98:FE:80
3
00:C0:A7:98:FE:9A
4
Port 5 (trunk port 3).
6.3.4 Port-based Mode Trunk Configuration
Assign ports that map to a trunk in this screen when you choose Port Based Method in the Load Balancing Mode
Selection screen shown previously. Aggregate between two and four ports to each trunk.
1 The last two bits are “81” which is “10000001” binary. Exclusive Or these last two (least significant) bits (01) to give “1”.
2 The last two bits are “9B” which is “10011011” binary. Exclusive Or these last two bits (11) to give “0”. [1,0] maps to trunk
port 2 according to the table above. As Trunk 2 is selected, trunk port 2 is Port 4.
3 The last two bits are “80” which is “10000000” binary. Exclusive Or these last two bits (00) to give “0”.
4
The last two bits are “9A” which is “10011010” binary. Exclusive Or these last two bits (10) to give “1”. [0,1] maps to trunk
port 3 according to the table above. As Trunk 2 is selected, trunk port 3 is Port 5.