Brocade BigIron RX Series Configuration Guide - Manual (Page 321)

BigIron RX Series Configuration Guide 243
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Configuration of a LAG
8
Specifying the trunk threshold for a trunk Group
You can configure the BigIron RX switch to disable all of the ports in a trunk group when the
number of active member ports drops below a specified threshold value. For example, if a trunk
group has 8 ports, and the threshold for the trunk group is 5, then the trunk group is disabled if the
number of available ports in the trunk group drops below 5. If the trunk group is disabled, then
traffic is forwarded over a different link or trunk group.
NOTE
This configuration is only applicable for configuration of a static or dynamic LAGs.
For example, the following commands establish a trunk group consisting of 4 ports, then establish
a threshold for this trunk group of 3 ports.
BigIron RX(config)# lag blue static
BigIron RX(config-lag-blue)# ports ethernet 3/1 to 3/4
BigIron RX(config-lag-blue)# trunk-threshold 3
In this example, if the number of active ports drops below 3, then all the ports in the trunk group
are disabled.
Syntax: trunk-threshold <number>
You can specify a threshold from 1 (the default) up to the number of ports in the trunk group.
When a LAG is shut down because the number of ports drops below the configured threshold, the
LAG is kept intact and it is re-enabled if enough ports become active to reach the threshold.
NOTE
Trunk threshold should be configured only at one end of the trunk. If it is set on both sides, link
failures will result in race-conditions and the trunk will not function properly.
Configuring LACP port priority
In a dynamic or keep alive LAG, the port priority determines the active and standby links. The other
ports (with lower priorities) become standby ports in the trunk group.
BigIron RX(config)# lag blue dynamic
BigIron RX(config-lag-blue)# lacp-port-priority 100000
Syntax: [no] lacp-port-priority <slot/port> <number>
For a port specified by the <slot/port> variable, you can specify a priority in the <number> variable
from 0 – 65535. A higher value indicates a lower priority. The default is 1.
NOTE
This configuration is only applicable for configuration of a dynamic or keep-alive LAGs.
Configuring an LACP timeout
In a dynamic or keep-alive LAG, a port's timeout can be configured as short or long. Once a port is
configured with a timeout option, it will remain in that timeout mode whether it's up or down, or
part of a trunk or not.
All the ports in a trunk should have the same timeout mode. This is checked when the LAG is
enabled on ports. To configure a port for a short LACP timeout use the following command.