Types Of Link Aggregation - 3Com Switch 7700 Configuration Manual

36 C 2: P C
HAPTER ORT ONFIGURATION
Types of Link
Aggregation
(point-to-point or not), STP priority, path cost, max transmission speed, loop
protection, root protection, edge port or not. The QoS setting includes traffic
limiting, priority marking, default 802.1p priority, bandwidth assurance,
congestion avoidance, traffic redirection, traffic statistics. The VLAN setting
includes permitted VLAN types, default VLAN ID. The port setting includes port
link type.
The Switch 7700 supports a maximum of sixty four load-balance groups, with
each group containing a maximum of eight 1000M ports or sixteen 100M ports.
For the 48-port 10/100Base-T auto-sensing fast Ethernet interface card, a port
grouped in first 24 ports cannot be aggregated with the one grouped in the last
24 ports.
Configuring Link Aggregation is described in the following sections:

Types of Link Aggregation

■
Load Sharing
■
Configuring Link Aggregation
■
Example: Link Aggregation Configuration
■
The types of link aggregation are described in the following sections:
Manual and Static LACP Aggregation
■
Dynamic LACP aggregation
■
Manual and Static LACP Aggregation
Both manual aggregation and static LACP aggregation require manual
configuration of aggregation groups. They prohibit automatic adding or deleting
of member ports by the system. A manual or static LACP aggregation group must
contain at least one member port, and you must delete the aggregation group,
instead of the port, if the group contains only one port. At a manual aggregation
port, LACP is disabled and you are not allowed to enable it. LACP is enabled at a
static aggregation port. When a static aggregation group is deleted, its member
ports form one or several dynamic LACP aggregation groups and LACP remains
enabled on them. You are not allowed to disable LACP protocol at a static
aggregation group.
In a manual or static LACP aggregation group, its ports may be in an active or
inactive state. However, only the active ports can receive user service packets. The
active port with the minimum port number serves as the master port, while others
act as sub-ports.
In a manual aggregation group, the system sets the ports to active or inactive state
based on these rules:
Based on the descending order of priority levels from full duplex/high speed, to
■
full duplex/low-speed, to half duplex/high speed and to half duplex/low speed,
the system sets the port with the highest priority to active state, and others to
inactive state.
The system sets ports to inactive state if they cannot aggregate with the active
■
port with the lowest port number due to a hardware limit, for example, if
trans-board aggregation is not available.