3Com Switch 8800 Advanced Software V5 Configuration Guide

70 CHAPTER 8: LINK AGGREGATION OVERVIEW
When aggregating ports, link aggregation control automatically assigns each port
an operational key based on its rate, duplex mode, and other basic configurations.
In a manual or static LACP aggregation, the selected ports share the same
operational key.
Consistency
Considerations for Ports
in an Aggregation
Group
To participate in traffic sharing, member ports in an aggregation group must use
the same configurations with respect to STP, QoS, GVRP, QinQ, BPDU tunnel,
VLAN, port attributes, MAC address learning, and so on, as shown in the
following table.
Tabl e 6 Consistency considerations for ports in an aggregation
Category Considerations
STP ■ State of port-level STP (enabled or disabled)
■ Attribute of the link (point-to-point or
otherwise) connected to the port
■ Port path cost
■ STP priority
■ Maximum transmission rate
■ Loop protection
■ Root protection
■ Port type (whether the port is an edge port)
QoS ■ Traffic policing
■ Traffic shaping
■ Congestion avoidance
■ Strict priority (SP) queuing
■ Port priority
■ Policy setting on the port
■ Flow template
GVRP ■ GVRP state on ports (enabled or disabled)
■ GVRP registration type
■ GARP timers
QinQ ■ State of QinQ (enabled or disabled)
■ Added outer VLAN tag
BPDU tunnel ■ BPDU tunnel state on ports (enabled or
disabled)
■ BPDU tunnel state for STP on ports (enabled
or disabled)
VLAN ■ VLANs carried on the port
■ Default VLAN ID on the port
■ Link type of the port, which can be trunk,
hybrid, or access
Port attribute ■ Port rate
■ Duplex mode
■ Up/down state of the link
■ Isolation group membership of the port