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Configuring the Switch
Load Balancing: Port Trunking
Configuring the Switch
Operating Information
This section describes port usage and how traffic is distributed by the various
trunking options.
Trunk Operation Using the “Trunk” Option
This method provides the best means for evenly distributing traffic over
trunked links to devices.
Configuring the Trunk (source address/destination address or SA/DA) option
for a port trunk causes the switch to distribute traffic in a sequential manner
to the links within the trunk on the basis of source/destination address pairs.
That is, traffic from the same source address to the same destination addresses
will travel over the same trunked link. Traffic from the same source address
but meant for different destination addresses will be distributed across differ-
ent links. Likewise, traffic for the same destination address but from different
source addresses will be distributed across different links. Because of this
feature, broadcasts, multicasts, and floods from different source addresses
are distributed evenly across the links. As links are added or deleted, traffic
will be redistributed across the trunk. For example, in the three-port trunk
shown below, traffic could be assigned as shown in the table below.
Figure 6-52. Example of Port-Trunked Network
Example of Link Assignments in a Trunk ((SA/DA Distribution)
Source: Destination: Link:
Node A Node W 1
Node B Node X 2
Node C Node Y 3
Node D Node Z 1
Node A Node Y 2
Node B Node W 3
Switch Switch
A
W
CY
BX
DZ
1
2
3