Monitor and Debug
555
please refer to traceroute command chapter in the command manual.
71.4
Traceroute6
The Traceroute6 function is used on testing the gateways passed through by the data
packets from the source equipment to the destination equipment, to verify the accessibility
and locate the network failure. The principle of the Traceroute6 under IPv6 is the same as
that under IPv4, which adopts the hop limit field of the ICMPv6 and IPv6 header. First,
Traceroute6 sends an IPv6 datagram (including source address, destination address and
packet sent time) whose HOPLIMIT is set to 1. When first route on the path receives this
datagram, it minus the HOPLIMIT by 1 and the HOPLIMIT is now 0. So the router will
discard this datagram and returns with a
「
ICMPv6 time exceeded
」
message (including
the source address of the IPv6 packet, all content in the IPv6 packet and the IPv6 address
of the router). Upon receiving this message, the Traceroute6 sends another datagram of
which the HOPLIMIT is increased to 2 so to discover the second router. Plus 1 to the
HOPLIMIT every time to discover another router, the Traceroute6 repeat this action till
certain datagram reaches the destination.
Traceroute6 Options and explanations of the parameters of the Traceroute6
command please refer to traceroute6 command chapter in the command manual.
71.5
Show
show
command is used to display information about the system, port and protocol
operation. This part introduces the
show
command that displays system information,
other
show
commands will be discussed in other chapters.
Command
Explanation
Admin Mode
show debugging
Display the debugging state.
show flash
Display the files and the sizes saved in the
flash.
show history
Display the recent user input history
command.