Operational key, Configuration classes, Reference port – H3C Technologies H3C WX5500E Series Access Controllers User Manual
Page 44
33
•
Selected—A Selected port can forward user traffic.
•
Unselected—An Unselected port cannot forward user traffic.
When a Selected port fails, an Unselected port might become a Selected port and 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 the operational key.
In an aggregation group, all selected member ports are assigned the same operational key.
Configuration classes
Every configuration setting on a port might affect its aggregation state. Port configurations include the
following classes:
•
Port attribute configurations—Include port rate, duplex mode, and link status (up/down). These 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.
Class-two configurations made on an aggregate interface are automatically synchronized to all
member ports of the interface. 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 ongoing traffic. To be sure that you are aware of the risk, the system displays
a warning message every time you attempt to change a class-two configuration setting on a
member port.
Table 2 Class-two configurations
Feature
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, port VLAN ID (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.
•
Class-one configurations—Include settings that do not affect the aggregation state of the member
port even if they are different from those on the aggregate interface. GVRP and the spanning tree
settings are examples of class-one configurations.
The class-one configuration for a member port is effective only when the member port leaves the
aggregation group.
Reference port
When setting the aggregation state of the ports in an aggregation group, the system automatically picks
a member port as the reference port. A Selected port must have the same port attributes and class-two
configurations as the reference port. For how to choose a reference port, see