Configuration Guide User guide

FastIron Configuration Guide 559

53-1002494-02

Management MAC address for stackable devices

In an IronStack, the management MAC address of the Active Controller is always used as the STP

bridge ID. The Active Controller management MAC address is always used for control protocols for

the following reasons:

• Unlike standalone devices, each stack member has a different range of MAC addresses.

• In a stack, the management MAC address is software generated, and is always the MAC

address of the Active Controller first port. This ensures consistency across the stack during

resets, assuming that the Active Controller is always the same unit.

• This helps avoid the disruption of frequent topology changes in the stack.

For more information about stacking and Brocade stackable devices, see Chapter 7, “Brocade

Stackable Devices”.

MAC learning rate control

NOTE

The MAC learning rate control feature is not supported on FastIron X Series devices.

You can set a rate limit to control CPU address updating. The range for this rate limit is 200 to

50,000 per second. The MAC learning rate limit applies to each packet processor, which means

that for a system with two packet processors, each processor can send address messages to the

CPU at the established rate limit.

Syntax: [no] cpu-limit addr-msgs <msgsRateLimit>

NOTE

Actual rates in hardware may have a variance of +200 or -100.