Brocade TurboIron 24X Series Configuration Guide - Manual (Page 389)

Brocade TurboIron 24X Series Configuration Guide 355
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Displaying and determining the status of aggregate links
The key <num> parameter identifies the group of ports that are eligible to be aggregated into a
trunk group. The software automatically assigns a key to each group of ports. The software assigns
the keys in ascending numerical order, beginning with 0. You can change a port group key to a
value from 10000 – 65535.
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.
Configuring port timeout
You can control the time it takes to remove ports from a trunk with link aggregation enabled by
configuring the link aggregated port with a “short” timeout mode. Once a port is configured with a
timeout mode, it will remain in that timeout mode whether it is up or down or whether or not it is
part of a trunk.
All ports in a trunk should have the same timeout mode, which is checked when link aggregation is
enabled on ports.
To configure a port with a short timeout mode, enter a command such as the following.
TurboIron(config)#interface ethernet1
TurboIron(config-if-e10000-1)#link-aggregation configure timeout short
Syntax: [no] link-aggregate configure timeout [short]
If the timeout mode is not configured for a port and link aggregation is enabled, the port starts with
a short timeout mode. Once a trunk is formed, the timeout mode is changed to the long timeout
mode. The value for “long” and “short” is displayed in the output for the show link-aggregate
command.
Displaying and determining the status of aggregate links
The show link-aggregation command provides the ability to view the status of dynamic links. You
can determine the status of ports that are members of an aggregate link, and whether LACPDU
messages are being transmitted between the ports.
The following section provides details about the events that can affect the status of ports in an
aggregate link and the status of LACP messages exchanged between the ports. Later sections
provide instructions for viewing these status reports.
Events that affect the status of ports in an aggregate link
Devices can block traffic on a port or shut down a port that is part of a trunk group or aggregate
link, when a port joins a trunk group and the port on the other end of the link shuts down or stops
transmitting LACP packets. Depending on the timeout value set on the port, the link aggregation
information expires. If this occurs, the device shuts down the port and notifies all the upper layer
protocols that the port is down.
Devices can also block traffic on a port that is initially configured with link aggregation. The port is
blocked until it joins a trunk group. In this case, traffic is blocked, but the port is still operational.
A port remains blocked until one of the following events occurs:
• Both ports in the aggregate link have the same key