3Com 10014298 manual Manual and Static Lacp Aggregation

Configuring Link Aggregation 43

Types of Link Aggregation

The operation key is a configuration set generated by LACP based on port setting (speed, duplex mode, basic configuration and management key). When LACP is enabled, the management key of a dynamic aggregation port is 0 by default, but the management key of a static aggregation port includes the aggregation group ID. For a dynamic aggregation group, all member ports must have the same operation key, while for a manual or static aggregation group, only the active member ports must have the same operation key.

The basic configuration of member ports in an aggregation group must be the same. That is, if one is a trunk port, others must be trunk ports also. If a port turns into an access port, then others must change to access ports.

Basic configuration includes the following types of settings:

■STP — Includes STP enabling/disabling, link attribute (point-to-point or not), STP priority, path cost, max transmission speed, loop protection, root protection, edge port or not

■QoS — Includes traffic limiting, priority marking, default 802.1p priority, bandwidth assurance, congestion avoidance, traffic redirection, traffic statistics

■VLAN — Includes permitted VLAN types and the default VLAN ID

■Port — Includes port link type

The Switch 7750 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.