HP StorageWorks 1606 Brocade Fabric OS Command Reference v6.3.0 (53-1001337-01 - Page 671

portCmd 2 portCmd Synopsis Description Notes Diagnoses intelligent ports. portcmd action [slot/]geport arguments optional_arguments Use this command to invoke the end-to-end IP path performance (ipperf) characterization feature, to ping or trace a route to a destination IP host from an intelligent GbE port, or to determine the path characteristics between a local data source and a remote data sink. When issued with the ipperf option, this command determines characteristics of the path to the remote host. The output of --ipperf -S includes the following information: Sampling frequency(s) The interval specified with the -i option or the default (30 seconds). Total Time(s) The time in seconds the command has been running since it was last issued. BW The bandwidth measured in the last interval. Bandwidth is defined as the total number of transmitted packets in bytes. BW represents what the FCIP tunnel and the FC application register as throughput rather than the Ethernet on-the-wire bytes. WBW The current bandwidth weighted with a gain of 50%. Loss(%) The number of TCP retransmits. This number averages the TCP retransmit rate over the last display interval. Delay(ms) The smoothed TCP round-trip time and variance estimate in milliseconds. PMTU The path maximum transmission unit (MTU) represents the largest IP layer datagram that can be transmitted over the end-to-end path without fragmentation. This value is measured in bytes and includes the IP header and payload. There is limited support for black hole PMTU detection. PTMUs of decreasing size are sent: Jumbo PMTU (greater than 1500 bytes), 1500 bytes, and 1260 bytes, the minimum PMTU supported for FCIP tunnels. If the 1260 PMTU transmission fails, --ipperf terminates. There is no support for aging. During black hole PMTU detection the BW, WBW, Loss and PMTU values printed may not be accurate. VLAN tagging ensures that test traffic traverses the same path as real FCIP traffic. A VLAN tag entry must exist prior to issuing the --ping or --traceroute commands; this includes both the local and remote sides. A VLAN Tag table entry is dynamically maintained by the ipperf application. The following portcmd features are platform-specific: Tperf Brocade FX-24 and 7800 only. VLAN tagging Brocade FR4-18i and 7500 only. ipperf Brocade FR4-18i and 7500 only. IPv6 Brocade FR4-18i and 7500 only. End-to-end path characterization is not supported if there exists an IPSec-enabled tunnel using the same source/local IP address. Fabric OS Command Reference 641 53-1001337-01