2-2IPv6 TracerouteThe traceroute ipv6 command is used to record the route of IPv6 packets from source to destination,so as to check whether the link is available and determine the point of failure.Figure 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 will discard the packet andreturn an ICMP timeout error message. Thus, the source can get the first device’s address in theroute.z The source sends a datagram with the Hop Limit of 2 and the second hop device returns an ICMPtimeout error message. The source gets the second device’s address in the route.z This process continues until the datagram reaches the destination host. As there is no applicationusing the UDP port, the destination returns a “port unreachable” ICMP error message.z The source receives the “port unreachable” ICMP error message and understands that the packethas reached the destination, and thus determines the route of the packet from source todestination.Follow these steps to traceroute IPv6:To do… Use the command… RemarksTraceroute IPv6tracert ipv6 [ -f first-ttl | -m max-ttl |-p port | -q packet-num | -wtimeout ]* remote-systemRequiredAvailable in any viewIPv6 TFTPIPv6 supports Trivial File Transfer Protocol (TFTP). As a client, the device can download files from orupload files to a TFTP server. For details about TFTP, see FTP-SFTP-TFTP Operation.Configuration preparationEnable TFTP on the TFTP server and specify the path to download or upload files. For specificoperations, refer to TFTP server configuration specifications.IPv6 TFTP configurationFollow these steps to download or upload files to TFTP servers:
