Operation Manual – IPv6 ManagementH3C S3100 Series Ethernet Switches Chapter 2 IPv6 Application Configuration2-22.2.2 IPv6 TracerouteThe traceroute ipv6 command is used to record the route of IPv6 packets from sourceto destination, so as to check whether the link is available and determine the point offailure.Device AHop Limit=1Hop Limit exceededHop Limit=2Hop Limit exceededHop Limit=nUDP port unreachableDevice B Device C Device DFigure 2-1 Traceroute processAs Figure 2-1 shows, the traceroute process is as follows:z The source sends an IP datagram with the Hop Limit of 1.z If the first hop device receiving the datagram reads the Hop Limit of 1, it willdiscard the packet and return an ICMP timeout error message. Thus, the sourcecan get the first device’s address in the route.z The source sends a datagram with the Hop Limit of 2 and the second hop devicereturns an ICMP timeout error message. The source gets the second device’saddress in the route.z This process continues until the datagram reaches the destination host. As thereis no application using the UDP port, the destination returns a “port unreachable”ICMP error message.z The source receives the “port unreachable” ICMP error message and understandsthat the packet has reached the destination, and thus determines the route of thepacket from source to destination.Table 2-2 Traceroute IPv6To do… Use the command… RemarksTraceroute IPv6tracert ipv6 [ -f first-ttl | -mmax-ttl | -p port | -q packet-num |-w timeout ]* remote-systemRequiredAvailable in any view2.2.3 IPv6 TFTPIPv6 supports TFTP (Trivial File Transfer Protocol). As a client, the device candownload files from or upload files to a TFTP server. For details about TFTP, seeFTP-SFTP-TFTP.
