Configuration Guide User guide

702 FastIron Configuration Guide
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Trunk group overview
Configuration notes for FastIron devices in an IronStack
In a Brocade IronStack system, a trunk group may have port members distributed across multiple
stack units. Both static and dynamic trunking are supported.
NOTE
Cascaded trunks between stack units are supported on Brocade ICX devices only.
To configure trunk groups for FastIron devices in an IronStack, use the CLI syntax in “CLI syntax for
configuring consecutive ports in a trunk group” on page 707.
The following notes apply to FastIron stackable devices that are part of an IronStack:
• If a stack unit fails or is removed from the stack, its static trunk configuration becomes a
reserved configuration on the Active Controller. Any remaining ports of the static trunk in the
IronStack continue to function.
• When a new stack unit is added to an IronStack, the new unit receives running configuration
and trunk-related information, including a list of ports that are up and are members of a trunk,
from the Active Controller.
• Before merging two IronStack devices, make sure that there are no static trunks configured
between them. This can result in self-looped ports.
• When an IronStack device with static trunks partitions into multiple IronStacks, loops and
forwarding errors may occur. In these cases, user intervention is required to remove the loops.
• 10 Gbps links support up to eight ports in a trunk for stackable units.
Trunk group configuration examples
Figure 64 shows some examples of valid 2-port trunk group links between devices. The trunk
groups in this example are switch trunk groups between two Brocade devices. Ports in a valid
2-port trunk group on one device are connected to two ports in a valid 2-port trunk group on
another device. The same rules apply to 3-port trunk groups, 4-port trunk groups, and so on.