Foundry Configuration Guide for the FESX, FSX, and FWSX
10 - 18
© Foundry Networks, Inc.
December 2005
Link Aggregation Parameters
You can change the settings on individual ports for the following link aggregation parameters:
•
System priority
•
Port priority
•
Link type
•
Key
System Priority
The system priority parameter specifies the Foundry 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 Foundry device to another vendor’s device and the link aggregation feature is
not working, set the system priority on the Foundry 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 parameter 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 Foundry 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 parameter 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
Every port that is 802.3ad-enabled has a key. The key identifies the group of potential trunk ports to which the
port belongs. Ports with the same key are called a key group and are eligible to be in the same trunk group.
When you enable link-aggregation on a tagged or untagged port, Foundry’s software assigns a default key to the
port. The default key is based on the position of the port within an eight-port group (the maximum number of ports
in a trunk group on a chassis device). The software assigns the keys in ascending numerical order, beginning with
key 0 for the first group of eight ports. For example, a 24-port module in chassis slot 1 contains keys 0, 1, and 2 by
default. Ports 1/1 – 1/8 have key 0, ports 1/9 – 1/16 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 10.7 on page 10-19 shows an example.
Содержание FastIron Edge Switch X424
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