HP StorageWorks 1606 Brocade Fabric OS Command Reference v6.3.0 (53-1001337-01 - Page 272

2 fcPing fcPing Synopsis Description Notes Operands Sends a Fibre Channel Extended Link Service (ELS) Echo request to a pair of ports or to a single destination. fcping [--number frames][--length size][--interval wait][--pattern pattern] [--bypasszone] [--quiet] [source] destination [--help] Use this command to send a Fibre Channel ELS Echo request to a pair of ports (a source and a destination) or to a single device. When using fcPing with a source and a destination, the command performs a zoning check between the two ports. In addition, two Fibre Channel ELS requests 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 identifier. 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 a 24-bit Fibre Channel port identifier, a port world wide name, or a node world wide name. The two port identifiers are then used to determine if the identifiers are zoned together. The ELS Echo requests contain 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 --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 a specified source or a destination. When using fcPing to probe a single destination, an ELS Echo is sent to the specified destination and a response obtained. The destination can be a switch WWN, a domain ID, or a switch domain controller ID. No zoning check is performed when a single device is probed. The ELS Echo may 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 may be needed to determine, whether the device does not support ELS Echo, or whether the request is rejected for some other reason. Do not assume that the device is not connected. 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. This command has the following operands: --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. 242 Fabric OS Command Reference 53-1001337-01