Brocade Communications Systems 8/80 Service Manual download pdf (Page 55)

Switching and Routing

Link Aggregation Parameters

You can change the settings for the following link aggregation parameters, on an individual port basis:

System Priority

The system-priority <num> parameter specifies the Brocade device’s link aggregation priority. On links on which

link aggregation is enabled, system priority specifies the Brocade device’s link aggregation priority relative to the

devices at the other ends. 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 Brocade device to another vendor’s device and the link aggregation feature is

not working, set the system priority on the Brocade 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 <num> 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 Brocade 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 type server | switch parameter specifies whether the port group is connected to a server (server) or to

another networking device (switch). The default is switch.

NOTE: When you change the trunk hashing from server to switch, or switch to server, you must disable or

enable the trunk.

For static trunk, execute the trunk deploy command after changing the hashing type.

For dynamic trunk (LACP), first execute the no link-aggr active command on trunk ports, change the hashing

type, and then execute the link-aggregation active command.

Key

Every port that is 802.3ad-enabled has a key. The key <num> parameter identifies the group of ports that are

eligible to be aggregated into a trunk group. 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, Brocade’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 Layer 3 Switch). 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.

NOTE: If you change the key for a port group, Brocade recommends that you use the value 10000 or higher, to

avoid potential conflicts with dynamically created keys.

Figure 2.6 on page 2-48 shows an example of ports with the same key but are in different aggregate links.

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Brocade Communications Systems 8/80 Service Manual Page 55