Definition of a MAD
Refer to Figure 28-1 on page 781. A Management Datagram (MAD) is always 256 bytes in length and is carried in the data payload field of either an SMP or a GMP. While an SMP MAD only contains an LRH (it never contains a GRH) and cannot be used to address a port outside of the SM's subnet, a GMP can contain a GRH and can be used to address a port outside of the subnet. This means that a GSM can be used to manage devices in multiple subnets.
Figure 28-1. A MAD Is Exactly 256 Bytes in Length
A MAD is generated under the following circumstances:
SMP MADs:
- The Master SM issues a SM MAD to a device's SMA requesting that a SubnGet() ...
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