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removing a static trunk via the configuration interface.
◆ 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 method used in the load-balance calculation can be selected to provide the best
result for trunk connections. The switch provides four load-balancing modes as described
in the following section.
◆ Aggregation Mode Configuration also applies to LACP (see "Configuring LACP" on page
114).
PARAMETERS
These parameters are displayed:
Aggregation Mode Configuration
◆ Hash Code Contributors – 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 MAC Address – 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. (One of the defaults.)
■ Destination MAC Address – 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.
■ IP Address – 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. (One of the
defaults.)
■ TCP/UDP Port Number – 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
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