HP 9304m Installation And Getting Started Manual page 151

Installation and Getting Started Guide
NOTE: Use the link aggregation feature only if the device at the other end of the links you want to aggregate also
supports IEEE 802.3ad link aggregation. Otherwise, you need to manually configure the trunk links.
Link aggregation support is disabled by default. You can enable the feature on an individual port basis, in active or
passive mode.
• Active mode – When you enable a port for active link aggregation, the HP port can exchange standard LACP
Protocol Data Unit (LACPDU) messages to negotiate trunk group configuration with the port on the other side
of the link. In addition, the HP port actively sends LACPDU messages on the link to search for a link
aggregation partner at the other end of the link, and can initiate an LACPDU exchange to negotiate link
aggregation parameters with an appropriately configured remote port.
• Passive mode – When you enable a port for passive link aggregation, the HP port can exchange LACPDU
messages with the port at the remote end of the link, but the HP port cannot search for a link aggregation port
or initiate negotiation of an aggregate link. Thus, the port at the remote end of the link must initiate the
LACPDU exchange.
NOTE: HP recommends that you disable or remove the cables from the ports you plan to enable for dynamic link
aggregation. Doing so prevents the possibility that LACP will use a partial configuration to talk to the other side of
a link. A partial configuration does not cause errors, but does sometimes require LACP to be disabled and re-
enabled on both sides of the link to ensure that a full configuration is used. It's easier to disable a port or remove
its cable first. This applies both for active link aggregation and passive link aggregation.
Enabling Link Aggregation
By default, link aggregation is disabled on all ports. To enable the feature, use the following CLI method.
USING THE CLI
To enable link aggregation on a set of ports, enter commands such as the following at the interface configuration
level of the CLI:
HP9300(config)# interface ethernet 1/1
HP9300(config-if-e1000-1/1)# link-aggregate active
HP9300(config)# interface ethernet 1/2
HP9300(config-if-e1000-1/2)# link-aggregate active
The commands in this example enable the active mode of link aggregation on ports 1/1 and 1/2. The ports can
send and receive LACPDU messages.
The following commands enable passive link aggregation on ports 1/5 – 1/8
HP9300(config)# interface ethernet 1/5 to 1/8
HP9300(config-mif-1/5-1/8)# link-aggregate passive
The commands in this example enable the passive mode of link aggregation on ports 1/5 – 1/8. These ports wait
for the other end of the link to contact them. After this occurs, the ports can send and receive LACPDU messages.
To disable link aggregation on a port, enter a command such as the following:
HP9300(config-if-e1000-1/8)# link-aggregate off
Syntax: [no] link-aggregate active | passive | off
Configuring Link Aggregation Parameters
You can change the settings for the following link aggregation parameters, on an individual port basis:
• System priority
• Port priority
• Link type
• Key
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