HP StorageWorks 2/16V Brocade Fabric OS Command Reference Manual - Supporting - Page 217

fcPing 2 fcPing Sends a Fibre Channel Extended Link Service (ELS) Echo request to a pair of ports. Synopsis fcping [-hbq][-n frames][-l length][-i wait][-p pattern] source destination Description Use this command to perform a zoning check between the source and destination. In addition, two Fibre Channel ELS request are 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 elicits an ELS Echo response from a port identifier in the fabric and is useful for validating link connectivity. The source and destination port identifiers can be specified as 24-bit Fibre Channel port identifiers, port World Wide Names, or node World Wide Names. The two port identifiers are then used to determine if the identifiers are zoned together. The ELS Echo requests comprise a 24-byte Fibre Channel frame header, a 4-byte ELS Echo request header, an 8-byte timestamp from gettimeofday, and an arbitrary number of bytes as specified by -l length to fill out the request frame. The source identifier in the ELS Echo request is the domain controller and the destination identifier is either source or destination. The echo ELS might not be supported on all devices. In such cases, the response could be either an ELS reject or a request timeout. By default, fcPing sends five ELS Echo requests to each port. When a device does not respond to the ELS Echo request, further debugging is necessary to understand if this is due to the device not supporting this ELS Echo request. Do not assume that the device is not FC-connected. The execution of this command is subject to Admin Domain restrictions that may be in place. Operands This command has the following operands: -n frames Specifies the number of ELS Echo requests to send. -l length Specifies requests containing length bytes of data. The default is 0 bytes of data. Without data, the Fibre Channel Echo request frame size is 12 total bytes. This is a combination of 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. -h Causes the program to display the proper command line usage syntax information and then terminate. -i wait Specifies the interval, in seconds, between successive ELS Echo requests. The default is 0 seconds. -p 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, -p ff causes the request frame to be filled with all 1s. -b Specifies to bypass the zone check functionality. -q Specifies quiet output. Only the zoning information and the summary line display on program termination. source Specifies the source port ID, port WWN, or node WWN. Fabric OS Command Reference Manual 185 53-1000436-01