HP 9304m Installation And Getting Started Manual page 152

Configuring Trunk Groups and Dynamic Link Aggregation
System Priority
The system priority specifies the HP device's link aggregation priority relative to the devices at the other ends of
the links on which link aggregation is enabled. A higher value indicates a lower priority. You can specify a priority
from 0 – 65535. The default is 1.
NOTE: If you are connecting the HP device to another vendor's device and the link aggregation feature is not
working, set the system priority on the HP device to a lower priority (a higher priority value). In some cases, this
change allows the link aggregation feature to operate successfully between the two devices.
Port Priority
The port priority determines the active and standby links. When a group of ports is negotiating with a group of
ports on another device to establish a trunk group, the HP port with the highest priority becomes the default active
port. The other ports (with lower priorities) become standby ports in the trunk group. You can specify a priority
from 0 – 65535. A higher value indicates a lower priority. The default is 1.
NOTE: This parameter is not supported in the current software release. The primary port in the port group
becomes the default active port. The primary port is the lowest-numbered port in a valid trunk-port group.
Link Type
The link type specifies whether the trunk is connecting to a server (server link) or to another networking device
(switch link). The default link type is switch.
Key
The key identifies the group of potential trunk ports this port belongs to. The software assigns a default key based
on the position of the four-port group in the chassis. The software numbers the keys in ascending order beginning
with key 0 for the first group of four ports. For example, an 8-port module in chassis slot 1 contains keys 0 and 1
by default. Ports 1/1 – 1/4 have key 0 and ports 1/5 – 1/8 have key 1, and so on.
All ports within an aggregate link must have the same key. However, if the device has ports that are connected to
two different devices, and the port groups allow the ports to form into separate aggregate links with the two
devices, then each group of ports can have the same key while belonging to separate aggregate links with
different devices. Figure 5.7 on page 5-22 shows an example.
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