H3C Technologies H3C S12500 Series Switches - Manual (Page 119)

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On a Layer 3 aggregate interface, you can create subinterfaces, which are called "Layer 3 aggregate
subinterfaces." These subinterfaces are logical interfaces that operate at the network layer. They can
receive VLAN tagged packets for their Layer 3 aggregate interface.
The rate of an aggregate interface equals the total rate of its member ports in selected state and its
duplex mode is the same as that of the selected member ports. For more information about the states of
member ports in an aggregation group, see " Aggregation states of member ports in an aggregation
group ."
Aggregation states of member ports in an aggregation group
A member port in an aggregation group can be in either of the following two aggregation states:
• Selected—A Selected port can forward user traffic.
• Unselected—An Unselected port cannot forward user traffic.
Operational key
When aggregating ports, the system automatically assigns each port an operational key based on port
information such as port rate and duplex mode. Any change to this information triggers a recalculation
of this operational key.
In an aggregation group, all selected member ports are assigned the same operational key.
Configuration classes
Every configuration setting on a member port in a link aggregation group might affect the aggregation
state of the port in the group more or less. They are divided into three configuration classes:
• Port attribute configurations—Includes port rate, duplex mode, and link status (up/down), which
are the most basic port configurations.
• Class-two configurations—A member port can be placed in selected state only if it has the same
class-two configurations as the aggregate interface.
Table 12 Class-two configurations
Item Considerations
Port isolation
Whether the port has joined an isolation group, and the isolation group to
which the port belongs
QinQ
QinQ enable state (enable/disable), TPID for VLAN tags, outer VLAN tags to
be added, inner-to-outer VLAN priority mappings, inner-to-outer VLAN tag
mappings, inner VLAN ID substitution mappings
VLAN
Permitted VLAN IDs, PVID, link type (trunk, hybrid, or access), IP
subnet-based VLAN configuration, protocol-based VLAN configuration,
VLAN tagging mode
MAC address learning
MAC address learning capability, MAC address learning limit, forwarding
of frames with unknown destination MAC addresses after the MAC address
learning limit is reached
NOTE:
•
Class-two configurations made on an aggregate interface are automatically synchronized to all its
member ports. These configurations are retained on the member ports even after the aggregate
interface is removed.
• Any class-two configuration change might affect the aggregation state of link aggregation member
ports and thus ongoing traffic. To make sure that you are aware of the risk, the system displays a