HP 1820 Management And Configuration Manual page 57

Table 6-2. Additional Trunk Configuration Fields
Field Description
STP Mode The spanning tree protocol (STP) mode of the trunk. When enabled, the trunk participates in the
STP operation to help prevent network loops. This feature is enabled on all trunks by default.
Load Balance The hashing algorithm used to distribute traffic load among the physical ports of the trunk while
preserving the per-flow packet order. The hashing algorithm uses various packet attributes to
determine the outgoing physical port.The following sets of packet attributes can be used to
compute the hashing algorithm:
• Source MAC, VLAN, Ethertype, Incoming Port
• Destination MAC, VLAN, Ethertype, Incoming Port
• Source/Destination MAC, VLAN, Ethertype, Incoming Port
• Source/Destination MAC, VLAN, Ethertype, Incoming Port (this is the default.)
• Source IP and Source TCP/UDP Port Fields
• Destination IP and Destination TCP/UDP Port Fields
• Source/Destination IP and TCP/UDP Port Fields
Port List/Members The Port List shows ports that are not members of the trunk, and the Members list shows the
ports that are members. Use the arrows to move ports between the lists.
Note the following considerations when configuring trunks and trunk members:
All ports in a trunk must have the same full-duplex speed.
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Loop protection is supported on static trunks, but not on dynamic trunks. If loop protection is enabled
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on a static trunk that is now being changed to a dynamic trunk, loop protection will be disabled on the
trunk.
A port that is added to a trunk loses its port VLAN membership and is assigned the VLAN memberships
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configured for the trunk. Individual port VLAN memberships cannot be configured for ports that are
members of a trunk. When the port is removed from a trunk, the port is made a member of the default
VLAN.
When ports are members of a trunk, they take on the STP configuration for the trunk. When ports are
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removed from a trunk, the take on their earlier configured STP states.
Click Apply to save any changes to the currently selected trunk. The changes take effect immediately.
Trunks
Trunk Configuration
6-3