Frame Types - Brocade Communications Systems Brocade 8/12c User Manual

Brocade network advisor san user manual v11.1x (53-1002167-01, may 2011)

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Frame Monitor

Frame types

The frame type can be a standard type (for example, a SCSI read command filter that counts the

number of SCSI read commands that have been transmitted by the port) or a user-defined frame

type customized for your particular use.

Pre-defined frame types

Pre-defined frame types include the following:

Custom frame types

In addition to the standard frame types, you can create custom frame types to gather statistics that

fit your needs. To define a custom frame type, you must specify a series of offsets, bitmasks, and

values. For all transmitted frames, the switch performs these tasks:

You can specify up to four values to compare against each offset. If more than one offset is

required to properly define a filter, the bytes found at each offset must match one of the given

values for the filter to increment its counter. If one or more of the given offsets does not match any

of the given values, the counter does not increment. The value of the offset must be between 0 and

63, in decimal format. Byte 0 indicates the first byte of the Start of Frame (SOF), byte 4 is the first

byte of the frame header, and byte 28 is the first byte of the payload. Thus only the SOF, frame

header, and first 36 bytes of payload can be selected as part of a filter definition. Offset 0 is a

special case, which can be used to monitor the first 4 bytes of the frame (SOF). When the offset is

set to 0, the values 0–7 that are checked against that offset are predefined as shown in

ABTS (Abort Sequence Basic Link Service command)

BA_ACC (Abort Accept)

SCSI-2 Reserve

SCSI-3 Reserve

Locates the byte found in the frame at the specified offset.

Applies the bitmask to the byte found in the frame.

Compares the new value with the given value.

Increments the filter counter if a match is found.

Predefined values at offset 0

Brocade Network Advisor IP User Manual

53-1002168-01

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