H3C Technologies H3C S7500E Series Switches - Manual (Page 127)

11-3
Table 11-1 Class-two configurations
Item 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, default VLAN, link type (trunk, hybrid, or access), IP
subnet-based VLAN configuration, protocol-based VLAN configuration, VLAN
tag 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 automatically synchronized 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 thus 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, which are configurations 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.
Reference port
When setting the aggregation state of the ports in an aggregation group, the system automatically
picks a member port as the reference. This port is called the reference port of the aggregation group.
The port attribute and class-two configurations of every other member port are compared with those of
the reference port.
IEEE 802.3ad LACP protocol
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.
1) LACP functions
Based on the fields carried in LACPDUs, the functions delivered by the IEEE 802.3ad LACP fall into
basic LACP functions and extended LACP functions, as described in
Table 11-2 .