Dell Brocade G620 Brocade 8.0.1 Fabric OS Command Reference - Page 271

fcPing fcPing Sends a Fibre Channel Extended Link Service (ELS) Echo request to a pair of ports or to a single destination, or executes a SuperPing. Synopsis fcping [--number frames] [--length size] [--interval wait] [--pattern pattern] [--bypasszone] [--quiet] [source] destination fcping --allpaths [-printisl] [-maxtries M] [-covcount N] [-delay D] [-framelength len] [-errstats] [-vc] 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." A SuperPing exercises all ISLs and the internal links included in the least-cost paths that route to the destination. It 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, the destination port identifier. To execute a SuperPing for two destinations, you must issue the fcping --allpaths 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 failures. 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. Brocade Fabric OS Command Reference 247 53-1004112-02