Link Aggregation Modes; Configuration Classes; Static Aggregation Mode - HP 1920 Gigabit Ethernet Switch Series User Manual

Configuration classes

Port configurations include the following classes:
• Class-two configurations—A member port can be placed in the Selected state only if it has the
same class-two configurations as the aggregate interface.
Table 63 Class-two configurations
Type
Port isolation
VLAN
MAC address
learning
Class-one configurations—Include settings that do not affect the aggregation state of the member
•
port even if they are different from those on the aggregate interface. For example, MSTP, can be
configured on aggregate interfaces and member ports. However, class-one configurations do not
take effect in operational key calculation.
Any class-two configuration change might affect the aggregation state of link aggregation member ports
and running services. To make sure you are aware of the risk, the system displays a warning message
every time you attempt to change a class-two configuration setting on a member port.

Link aggregation modes

Based on the link aggregation procedure, link aggregation operates in one of the following modes:

Static aggregation mode

•
• Dynamic aggregation mode
Static aggregation mode
LACP is disabled on the member ports in a static aggregation group. In a static aggregation group, the
system sets the aggregation state of each member port according to the following rules:
1. Chooses a reference port from the member ports that are in up state and with the same class-two
configurations as the aggregate interface. The candidate ports are sorted in the following order:
Full duplex/high speed
Full duplex/low speed
Half duplex/high speed
Half duplex/low speed
If two ports have the same duplex mode/speed pair, the one with the lower port number is chosen.
2. Places the ports in up state with the same port attributes and class-two configurations as the
reference port in the Selected state, and place all others in the Unselected state.
3. The number of Selected ports is limited in a static aggregation group. When the number of the
Selected ports is under the limit, all the member ports become Selected ports. When the limit is
Considerations
Whether a port has joined an isolation group, and the isolation group to which
the port belongs.
Permitted VLAN IDs, port VLAN ID (PVID), link type (trunk, hybrid, or access), IP
subnet-based VLAN configuration, protocol-based VLAN configuration, and
VLAN tagging mode.
MAC address learning capability, MAC address learning limit, and forwarding
of frames with unknown destination MAC addresses after the upper limit of the
MAC address table is reached.
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