Dell PowerEdge M610x Fabric OS Command Reference Manual Supporting Fabric - Page 724
During black hole PMTU detection the BW, WBW, Loss and PMTU, Delayms, ipperf, traceroute, portcmd
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2 portCmd 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 FX-24/7800 and FR4-18i/7500. IPv6 Brocade FX-24/7800 and FR4-18i/7500. ipperf Brocade FR4-18i and 7500 only. Notes End-to-end path characterization is not supported if there exists an IPSec-enabled tunnel using the same source/local IP address. Make sure to use --ping and --ipperf with a double-dash (--). If the dashes are omitted, a message displays indicating that the command is deprecated. 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. Operands This command has the following operands: slot For bladed systems only, specifies the slot number of the port to be configured, followed by a slash (/). geport Specifies the port number of the GbE port on the blade. --ipperf Determines the path characteristics to the remote host. Valid arguments and their values include the following: -s src_ip -d dst_ip Specifies the local IP address to use for sourcing the probe packets. ipperf will not start if there exists an IPSec-enabled tunnel using the same source IP address. IPv6 addresses are supported. Specifies the destination IP address to which to probe the IP router path. IPv6 addresses are supported. -S Instructs the source mode to initiate the TCP connection. The source end-point generates a traffic stream and reports the end-to-end IP path characteristics from this end-point to the receiver end-point sink. 692 Fabric OS Command Reference 53-1001764-02