H3C Technologies H3C S5560 Series Switches - Manual (Page 58)

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Feature Considerations
VLAN
VLAN attribute configurations include the following:
• Permitted VLAN IDs.
• PVID.
• Link type (trunk, hybrid, or access).
• Operating mode (promiscuous, trunk promiscuous, host).
• VLAN tagging mode.
For information about VLAN, see "Configuring VLANs."
• Protocol configurations—Protocol configurations do not affect the aggregation state of the member
ports. MAC address learning and spanning tree settings are examples of protocol configurations.
NOTE:
The protocol configuration for a member port is effective only when the member port leaves the
aggregation group.
Link aggregation modes
Link aggregation has dynamic and static modes:
• Static aggregation mode—Aggregation is stable. The aggregation state of the member ports are
not affected by the peer ports.
• Dynamic aggregation mode—The peering system automatically maintains the aggregation state of
the member ports, which reduces the administrators' workload.
An aggregation group in static mode is called a "static aggregation group" and an aggregation group
in dynamic mode is called a "dynamic aggregation group."
Aggregating links in static mode
Choosing a reference port
When setting the aggregation state of the ports in an aggregation group, the system automatically
chooses a member port as the reference port. A Selected port must have the same operational key and
attribute configurations as the reference port.
The system chooses a reference port from the member ports that are in up state with the same attribute
configurations as the aggregate interface.
The candidate ports are sorted in the following order:
1. Highest port priority
2. Full duplex/high speed
3. Full duplex/low speed
4. Half duplex/high speed
5. Half duplex/low speed
The candidate port at the top is chosen as the reference port.