Ipv6 Traceroute - H3C S3100-52P Operation Manual

Operation Manual – IPv6 Management
H3C S3100-52P Ethernet Switch
Caution:
When you use the ping ipv6 command to verify the reachability of the destination, you
must specify the "–i" keyword if the destination address is a link-local address.

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.
Figure 2-1 Traceroute process
As Figure 2-1
The source sends an IP datagram with the Hop Limit of 1.
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.
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.
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.
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.
shows, the traceroute process is as follows:
2-2
Chapter 2 IPv6 Application Configuration