68
NOTE:
•
The router supports up to 240 aggregation groups.
•
On a Layer 3 aggregate interface, you can create subinterfaces. These subinterfaces are logical
interfaces that operate at the network layer. They can receive VLAN tagged packets for their Layer 3
aggregate interface.
•
The rate of an aggregate interface equals the total rate of its member ports in Selected state, and its
duplex mode is the same as the selected member ports. For more information about the states of
member ports in an aggregation group, see “
Aggregation states of member ports in an aggregation
Aggregation states of member ports in an aggregation group
A member port in an aggregation group can be in either of the following aggregation states:
•
Selected
—A Selected port can forward user traffic.
•
Unselected
—An Unselected port cannot 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 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
. A member port can be placed in Selected state
only if it has the same class-two configurations as the aggregate interface.
Table 8
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, 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
