Brocade Communications Systems Brocade 8/12c Command Reference Manual page 589

Reverse path
Source route
NOTES
The execution of this command is subject to Virtual Fabric or Admin Domain restrictions that may be in
place. Refer to Chapter 1, "Using Fabric OS Commands" and Appendix A, "Command Availability" for
details.
OPERANDS
This command has the following operands:
destination_switch
source_port
Fabric OS Command Reference
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Words
The total number of 4-byte Fibre Channel words.
Frames
The total number of frames.
Errors
The total number of errors that may have caused a frame not to be received
correctly. This includes cyclic redundancy check (CRC) errors, bad end-of-frame
(EOF) errors, frame truncated errors, frame-too-short errors, and encoding errors
inside a frame.
The path from port A on switch X to port B on switch Y may be different from the
path from port B to port depending on the links traversed between a given
sequence of switches, or the reverse path may involve different switches. The -r
option displays routing and statistics information for the reverse path in addition to
those for the direct path.
The source route option allows you to specify a sequence of switches or ports,
which the pathInfo frame has to traverse to reach the destination. Therefore, the
path specified may be different from the one used by actual traffic.
The source route is expressed as a sequence of switches, a sequence of output
ports, or a combination of both. The next hop in the source route is described by
either the output port to be used to reach the next hop, or the domain ID of the
next hop.
The source route can specify a full route from source to destination or a partial
route. In a partial route the remaining hops are chosen as the path from the input
port on the first hop not listed in the source route to the destination. The maximum
hop count is enforced in both cases.
If the source route does not specify all the switches along a section of the path,
you can specify a strict or a loose path. A strict source route requires that only the
specified switches are reported in the path description. If two switches are
specified back-to-back in the source route descriptor but are not directly
connected, the switches in-between are ignored. In a loose source route, the
switches in-between are reported. The concepts of strict and loose route apply
only to the portions of the path described by domains, not to the part described by
output ports.
Specifies the destination switch. To obtain path info in a Layer 2 fabric, the
destination switch can be identified by its Domain ID, by the switch WWN, or by
the switch name. To obtain path info across remote fabrics connected through an
FC Router, the destination switch must be identified by its Domain ID. Identifying
the switch by name or WWN is not accepted. This operand is optional; if omitted,
the command prompts for input interactively.
Specifies the port whose path to the destination domain is traced, specified as the
port index. The embedded port (-1) is the default. The embedded port can be
selected manually by entering the value of MAX_PORT. MAX_PORT stands for
the maximum number of ports supported by the local switch.
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pathInfo
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