Dell Brocade 6520 Fabric OS Troubleshooting and Diagnostics Guide v7.1.0 - Page 34

ATTENTION, Superping and fcPing paths

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2 FC-FC routing connectivity ATTENTION There are some devices that do not support the ELS ECHO request. In these cases, the device either does not respond to the request or send an ELS reject. When a device does not respond to the ELS request, further debugging is required; however, do not assume that the device is not connected. It works by sending ECHO frames to a destination device and outputs the status of each ISL it traverses whether or not the response from the destination device is received. Each ECHO frame may choose any path from multiple available paths in the fabric to reach the destination device. This utility allows you to do the following: • Run a sanity test that exercises all the ISLs and internal links in different paths that route to the destination device. • Determines the least cost path to aid in designing fabric redundancy. • Determines the specific ISLs and internal links with failures. • Exercises all ISL links in the base fabric for a logical fabric configuration. The number of actual paths covered when using the superping tool depends on two other parameters that you can optionally specify. When you issue the fcPing --allpaths command without any other options, superping covers all ISLs in the routes between source to destination, as shown in Figure 1. FIGURE 1 Superping and fcPing paths 18 Fabric OS Troubleshooting and Diagnostics Guide 53-1002751-01

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18
Fabric OS Troubleshooting and Diagnostics Guide
53-1002751-01
FC-FC routing connectivity
2
ATTENTION
There are some devices that do not support the ELS ECHO request. In these cases, the device either
does not respond to the request or send an ELS reject. When a device does not respond to the ELS
request, further debugging is required; however, do not assume that the device is not connected.
It works by sending ECHO frames to a destination device and outputs the status of each ISL it
traverses whether or not the response from the destination device is received. Each ECHO frame
may choose any path from multiple available paths in the fabric to reach the destination device.
This utility allows you to do the following:
•
Run a sanity test that exercises all the ISLs and internal links in different paths that route to the
destination device.
•
Determines the least cost path to aid in designing fabric redundancy.
•
Determines the specific ISLs and internal links with failures.
•
Exercises all ISL links in the base fabric for a logical fabric configuration.
The number of actual paths covered when using the superping tool depends on two other
parameters that you can optionally specify. When you issue the
fcPing
--
allpaths
command
without any other options, superping covers all ISLs in the routes between source to destination, as
shown in
Figure 1
.
FIGURE 1
Superping and fcPing paths