1-5z Enable sending of ICMP destination unreachable packets on the destination device. If thedestination device is an H3C device, execute the ip unreachables enable command. For moreinformation about this command, see IP Performance Optimization Configuration Commands inthe Layer 3 - IP Services Command Reference.Tracert configurationFollow these steps to configure tracert:To do… Use the command… RemarksEnter system view system-view —tracert [ -a source-ip | -f first-ttl | -mmax-ttl | -p port | -q packet-number |-vpn-instance vpn-instance-name | -wtimeout ] * hostDisplay the routes from sourceto destinationtracert ipv6 [ -f first-ttl | -m max-ttl | -pport | -q packet-number | -w timeout ] *hostRequiredUse either approachThe tracert command isapplicable in an IPv4 network;the tracert ipv6 command isapplicable in an IPv6 network.Available in any viewSystem DebuggingIntroduction to System DebuggingThe device provides various debugging functions. For the majority of protocols and featuressupported, the system provides corresponding debugging information to help users diagnose errors.The following two switches control the display of debugging information:z Protocol debugging switch, which controls protocol-specific debugging information.z Screen output switch, which controls whether to display the debugging information on a certainscreen.As Figure 1-3 illustrates, assume the device can provide debugging for the three modules 1, 2, and3. The debugging information can be output on a terminal only when both the protocol debuggingswitch and the screen output switch are turned on.
