Dell PowerEdge M610x Fabric OS Command Reference Manual Supporting Fabric - Page 295

fcPing 2 fcPing Synopsis Sends a Fibre Channel Extended Link Service (ELS) Echo request to a pair of ports or to a single destination, or executes a SuperPing. fcping [--number frames][--length size][--interval wait][--pattern pattern] [--bypasszone] [--quiet] [source] destination fcping --allpaths] [-printisl] [-maxTries M][-covcount N][-delay N] destination fcping --help Description Use this command to send a Fibre Channel ELS Echo request to a pair of ports (a source and a destination), to a single device, or to execute a SuperPing that exercises all interswitch links (ISLs) and internal links in different paths that route to the destination device. • When you use 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 (PISD), 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. • When you use 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. • When you use fcPing with the --allpaths option, the command exercises a "SuperPing." Superping exercises all ISLs and the internal links included in the paths that route to the destination. The SuperPing command collects statistical data of all the covered paths and their port and provides optional parameters to selectively display the data. SuperPing takes only one argument, that is, the destination port identifier. To execute SuperPing for two destination, you must issue the command separately for each destination. Superping facilitates troubleshooting of links that experience problems. When an echo frame is dropped, all the ISLs and internal links potentially traversed by this frame are marked as failure. If a fabric topology is considered fully redundant, that is, at each hop there are multiple paths to reach a destination, a high percentage of errors are recorded on the link that experiences errors. Logical Fabrics: When executed in a Logical Fabric from a switch to a destination device connected through the base fabric, SuperPing exercises all paths in the base fabric along with the ISLs in the logical fabric. The path output indicates the LISLs and the base switch. Refer to the example section for an illustration. Notes 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. Fabric OS Command Reference 263 53-1001764-02