2-2
IPv6 Traceroute The 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 process
As 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 and
return an ICMP timeout error message. Thus, the source can 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 device returns an ICMP
timeout 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 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 understands that the packet
has reached the destination, and thus determines the route of the packet from source to
destination.
Follow these steps to traceroute IPv6:
To do… Use the command… Remarks
Traceroute IPv6
tracert ipv6 [ -f first-ttl | -m max-ttl | -p
port | -q packet-num | -w timeout ]*
remote-system
Required
Available in any view
IPv6 supports Trivial File Transfer Protocol (TFTP). As a client, the device can download files from or
upload files to a TFTP server. For details about TFTP, see FTP-SFTP-TFTP Operation.
Configuration preparation
Enable TFTP on the TFTP server and specify the path to download or upload files. For specific
operations, refer to TFTP server configuration specifications.
IPv6 TFTP configuration
Follow these steps to download or upload files to TFTP servers: