User manual

C HAPTER 4 | Configuring the Switch
Creating Trunk Groups
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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 123).
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 web browsing. However, it can be used effectively in
combination with the IP Address option. (One of the defaults.)