HP 5820X Series

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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 port may affect its aggregation state. Port configurations fall into the
following classes:
• Port attribute configurations, including port rate, duplex mode, and link status (up/down), which are
the most basic port configurations.
• Class-two configurations, as described in Table 4. A me
mber port can be placed in the selected
state only if it has the same class-two configurations as the aggregate interface.
Table 4 Class-two configurations
Feature Considerations
Port isolation Whether the port has joined an isolation group
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
Class-two configurations made on an aggregate interface are synchronized automatically 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 may affect the aggregation state of link aggregation member ports
and ongoing traffic. To make 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.
• Class-one configurations do not affect the aggregation state of the member port even if they are
different from those on the aggregate interface. GVRP and MSTP settings are examples of class-one
configurations.
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.
LACP
The IEEE 802.3ad LACP enables dynamic aggregation of physical links. It uses LACPDUs for exchanging
aggregation information between LACP-enabled devices.
1. LACP functions
The IEEE 802.3ad LACP offers basic LACP functions and extended LACP functions, as described in Table
5.