HP 3100 Series Configuration Manual page 39

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Configuration classes
Every configuration setting on a port might affect its aggregation state. Port configurations fall into
the following classes:
Port attribute configurations—Includes 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 its member ports. These
configurations are retained on the member ports even after the aggregate interface is removed.
Table 2 Class-two configurations
Feature
Port isolation
QinQ
VLAN
MAC address learning
NOTE:
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.
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 MSTP
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.
LACP
The IEEE 802.3ad Link Aggregation Control Protocol (LACP) enables dynamic aggregation of
physical links. It uses link aggregation control protocol data units (LACPDUs) for exchanging
aggregation information between LACP-enabled devices.
LACP functions
1.
The IEEE 802.3ad LACP offers basic LACP functions and extended LACP functions, as
described in
Table 3 Basic and extended LACP functions
Category
Basic LACP
functions
Considerations
Whether the port has joined an isolation group
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
Permitted VLANs, PVID, link type (trunk, hybrid, or access), IP subnet-based
VLAN configuration, protocol-based VLAN configuration, VLAN tagging mode
MAC address learning capability
Table
3.
Description
Implemented through the basic LACPDU fields, including the system LACP priority,
system MAC address, port aggregation priority, port number, and operational key.
Each member port in a LACP-enabled aggregation group exchanges the preceding
information with its peer. When a member port receives an LACPDU, it compares the
received information with the information received on the other member ports. In this way,
the two systems reach an agreement on which ports should be placed in the Selected
state.
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