Brocade Fabric OS Troubleshooting and Diagnostics Guide v6.2.0 (53-1001187-01, April 2009)

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Fabric OS Troubleshooting and Diagnostics Guide 15

53-1001187-01

Fibre Channel Router connectivity

This section describes tools you can use to troubleshoot Fibre Channel routing connectivity and

performance.

Generate and route an ECHO

The FC-FC Routing Service enables you to route the ECHO generated when an fcPing command is

issued on a switch, providing fcPing capability between two devices in different fabrics across the

FC router.

The fcPing command sends a Fibre Channel ELS ECHO request to a pair of ports. It performs a

zone check between the source and destination. In addition, two Fibre Channel Extended Link

Service (ELS) requests will be generated. The first ELS request is from the domain controller to the

source port identifier. The second ELS request is from the domain controller to the destination port

identifiers. The ELS ECHO request will elicit an ELS ECHO response from a port identifier in the

fabric and validates link connectivity.

To validate link connectivity to a single device or between a pair of devices, use the fcPing

command in the following syntax:

fcping [

--number frames][--length size][--interval wait][--pattern pattern] [--bypasszone]

[

--quiet] [source] destination [--help]

Where:

--number frames Specifies the number of ELS Echo requests to send. The default value is 5.

length size Specifies the frame size of the requests in bytes. The default value is 0.

Without data, the Fibre Channel Echo request frame size is 12 bytes. The

total byte count includes four bytes from the Echo request header and eight

bytes from the timestamp. The maximum allowed value is 2,036 bytes. The

length must be word-aligned.

interval wait Specifies the interval, in seconds, between successive ELS Echo requests.

The default value is 0 seconds.

pattern pattern Specifies up to 16 "pad" bytes, which are used to fill out the request frame

payload sent. This is useful for diagnosing data-dependent problems in the

fabric link. The pattern bytes are specified as hexadecimal characters. For

example, the --pattern ff fills the request frame with instances of the

number 1. If a non-byte aligned pattern is specified, the upper nibble of the

last pattern byte is filled with zeros. For example, --pattern 123 fills the

payload with a pattern of 0x1203.

bypasszone Bypasses the zone check

quiet Suppresses the diagnostic output. Only zoning information, if applicable, and

the summary line are displayed.

source

Specifies the source port ID, port WWN, or node WWN. This operand is

optional.

destination

Specifies the destination. When using fcPing between a source and a

destination, specify the destination as a port WWN or a node WWN. When

using fcPing to ping a single device, specify the destination as a switch WWN,

a domain ID, or a switch domain controller ID.

help Displays the command usage.