3Com S7902E, Configuration Manual

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1-3
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Switches of the S7900E series that support extended LACP functions can function as both member
devices and intermediate devices in LACP MAD implementation.
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For details about IRF, member devices, intermediate devices, and the LACP MAD mechanism, see
IRF in the System Volume .
Operational key
When aggregating ports, link aggregation control automatically assigns each port an operational key
based on port attributes, including the port rate, duplex mode and link state configuration.
In an aggregation group, all selected ports are assigned the same operational key.
Class-two configurations
The contents of class-two configurations are listed in Table 1-1. In an aggregation group, a member port
different from the aggregate interface in the class-two configurations cannot be a selected port.
Table 1-1 Class-two configurations
Type Considerations
Port isolation Whether a port has joined an isolation group
QinQ
QinQ enable state (enable/disable), TPID values in 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, 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
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Some configurations are called class-one configurations. Such configurations, for example, GVRP
and MSTP, can be configured on aggregate interfaces and member ports but will not affect the
select state of link aggregation member ports.
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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.