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C
6
HAPTER
Configuring Trunk Settings
C
T
ONFIGURING
RUNK
S
ETTINGS
When incoming data frames are forwarded through the switch to a trunk,
the switch must determine to which port link in the trunk an outgoing
frame should be sent. To maintain the frame sequence of various traffic
flows between devices in the network, the switch also needs to ensure that
frames in each "conversation" are mapped to the same trunk link.
To achieve this requirement and to distribute a balanced load across all
links in a trunk, the switch uses a hash algorithm to calculate an output
link number in the trunk. However, depending on the device to which a
trunk is connected and the traffic flows in the network, this load-balance
algorithm may result in traffic being distributed mostly on one port in a
trunk. To ensure that the switch traffic load is distributed evenly across all
links in a trunk, the hash methods used in the load-balance calculation can
be selected to provide the best result for trunk connections. The switch
provides five load-balancing methods as described below.
P
ARAMETERS
The following parameters are displayed on the Trunk Setting page:
◆
Distribution Algorithm Parameters – Selects the load-balance
method to apply to all trunks on the switch. If more than one option is
selected, each factor is used in the hash algorithm to determine the
port member within the trunk to which a frame will be assigned. The
following options are supported:
Source Port – All traffic with the same source and destination TCP/
■
UDP port number is output on the same link in a trunk. Avoid using
his mode as a lone option. It may overload a single port member of
the trunk for application traffic of a specific type, such as web
browsing. However, it can be used effectively in combination with
the IP Address option.
Source MAC – All traffic with the same source MAC address is
■
output on the same link in a trunk. This mode works best for
switch-to-switch trunk links where traffic through the switch is
received from many different hosts. (The default.)
Dest. MAC – All traffic with the same destination MAC address is
■
output on the same link in a trunk. This mode works best for
switch-to-switch trunk links where traffic through the switch is
destined for many different hosts. Do not use this mode for switch-
to-router trunk links where the destination MAC address is the same
for all traffic.
Source IP – All traffic with the same source and destination IP
■
address is output on the same link in a trunk. This mode works best
for switch-to-router trunk links where traffic through the switch is
destined for many different hosts. Do not use this mode for switch-
to-server trunk links where the destination IP address is the same
for all traffic.
– 52 –
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