Operation Manual – IPv6 Management
H3C S3100 Series Ethernet Switches
Chapter 2 IPv6 Application Configuration
2-2
2.2.2 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.
Device A
Hop Limit=1
Hop Limit exceeded
Hop Limit=2
Hop Limit exceeded
Hop Limit=n
UDP port unreachable
Device B
Device C
Device D
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.
Table 2-2
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
2.2.3 IPv6 TFTP
IPv6 supports TFTP (Trivial File Transfer Protocol). As a client, the device can
download files from or upload files to a TFTP server. For details about TFTP, see
FTP-SFTP-TFTP
.
