3Com 4510G Configuration Manual page 53

When a Marker Response Protocol Data Unit (PDU) is received from the peer or the timer
expires, the device starts to redistribute service traffic on all the new link aggregation member
ports in selected state.
Currently, the Switch 4510G Family support returning Marker Response PDUs only after dynamic link
aggregation member ports receive Marker PDUs.
Operational key
When aggregating ports, link aggregation control automatically assigns each port an operational key
based on the port attributes, including the configurations of the port rate, duplex mode and link state.
In a link aggregation group, all member ports in the selected state have the same operation key.
Class-two configurations
Class-two configurations are listed in
member port are different from the class-two configurations, that member port cannot be a selected
port.
Table 2-1 Class-two configurations
Type
Port isolation Whether a port has joined an isolation group
QinQ enable state (enable/disable), outer VLAN tags to be added, inner-to-outer
QinQ
VLAN priority mappings, inner-to-outer VLAN tag mappings, inner VLAN ID
substitution mappings
Permitted VLAN IDs, default VLAN, link type (trunk, hybrid, or access), IP
VLAN
subnet-based VLAN configuration, protocol-based VLAN configuration, tag mode
MAC address learning capability, MAC address learning limit, forwarding of frames
MAC address
with unknown destination MAC addresses after the upper limit of the MAC address
learning
table is reached
Some configurations are called class-one configurations. Such configurations, for example, GVRP
and MSTP, can be configured on aggregate interfaces and member ports but are not considered
during operational key calculation.
The change of a class-two configuration setting may affect the select state of link aggregation
member ports and thus the ongoing service. To prevent unconsidered change, a message
warning of the hazard will be displayed when you attempt to change a class-two setting, upon
which you can decide whether to continue your change operation.
Table 2-1. In an aggregation group, if the configurations of a
Considerations
2-3