3Com 4210G Series, Configuration Manual, Page: 54 / 1133

2-3
z
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 4210G 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 Table 2-1 . In an aggregation group, if the configurations of a
member port are different from the class-two configurations, that member port cannot be a selected
port.
Table 2-1
Class-two configurations
Type Considerations
Port isolation Whether a port has joined an isolation group
QinQ
QinQ enable state (enable/disable), 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, default VLAN, link type (trunk, hybrid, or access), IP
subnet-based VLAN configuration, protocol-based VLAN configuration, tag mode
MAC address
learning
MAC address learning capability, MAC address learning limit, forwarding of frames
with unknown destination MAC addresses after the upper limit of the MAC address
table is reached