HP ProCurve 1800-8G, Management And Configuration Manual

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Using the ProCurve Web Browser Interface
Web Configuration
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Trunk Membership
This page allows you to create static trunks. Trunking allows you to assign
physical links to one logical link (trunk) that functions as a single, higher-
speed link providing dramatically increased bandwidth. This capability
applies to connections between backbone devices as well as to connections
in other network areas where traffic bottlenecks exist.
The Membership Table has one row for each port and a column for each trunk,
plus an additional column for ports that are not members of a trunk. Each row
contains radio buttons that are used to indicate which trunk (if any) the port
belongs to.
Aggregation Mode
When incoming data frames are fowarded by the switch over a trunk, the
switch must determine which port link in the trunk to use for each outgoing
frame. To maintain the frame sequence for 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. In order to meet this
requirement and to distribute a balanced load across all links in a trunk, the
switch uses an algorithm based on the frame source or destination addresses
to calculate an output link member 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 to one
port in a trunk.
To ensure that the switch traffic load is distributed evenly across all links in
a trunk, the source or destination addresses used in the load-balance
calculation can be selected to provide the best result for trunk connections.
The switch provides six load-balancing modes that apply for both static and
dynamic trunks:
■ SMAC: 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.
Port Trunking Support ProCurve 1800-8G ProCurve 1800-24G
Ports per trunk (maximum) 8 8
Trunks per switch (maximum) 4 12