Traceroute for IPv6

The traceroute6 command enables you to trace the route from a switch to a host device that is identified by an IPv6 address or IPv6 host name. In the command output, information on each (router) hop between the switch and the destination IPv6 address is displayed.

To use a traceroute6 command with an IPv6 host name or fully qualified domain names, see DNS resolver for IPv6.

Note that each time you perform a traceroute operation, the traceroute command uses the default settings unless you enter different values with each instance of the command.

Replies to each traceroute operation are displayed on the console screen. To stop a traceroute operation before it finishes, press [Ctrl] [C].

For more information about how to configure and use a traceroute operation, see the ArubaOS-Switch Management and Configuration Guide for your switch.

Syntax:

traceroute6 <ipv6–address|hostname> [minttl <1–255> [maxttl <1–255> [timeout <1–120>] [probes <1–5>] [source <ipv6–addr|vid|loopback <0-7>] [dstport <1-34000>] [srcport <1-34000>]

Syntax:

traceroute6 <link-local–address %vlan <vid>|hostname> [minttl <1–255> [maxttl <1–255> [timeout <1–120>] [probes <1–5>] [source <ipv6–addr|vid>]

Lists the IPv6 address of each hop in the route to the specified destination host device with the time (in microseconds) required for a packet reply to be received from each next-hop device.

<ipv6–address> : IPv6 address of a destination host device.

<link-local–address> %vlan <vlan–id> : IPv6 link-local address, where %vlan <vlan–id> specifies the VLAN ID number.

<hostname> : Host name of an IPv6 host device configured on an IPv6 DNS server.

minttl : Minimum number of hops allowed for each probe packet sent along the route. Default: 1; Range: 1–255

  • If the minttl value is greater than the actual number of hops, the traceroute output displays only the hops equal to or greater than the configured minttl threshold value. The hops below the threshold value are not displayed.

  • If the minttl value is the same as the actual number of hops, only the final hop is displayed in the command output.

  • If the minttl value is less than the actual number of hops, all hops to the destination host are displayed.

maxttl : Maximum number of hops allowed for each probe packet sent along the route. Valid values: 1–255. Default: 30

If the maxttl value is less than the actual number of hops required to reach the host, the traceroute output displays only the IPv6 addresses of the hops detected by the configured maxttl value.

timeout : Number of seconds within which a response is required from the IPv6 device at each hop in the route to the destination host before the traceroute operation times out. Default: 5 seconds; Range: 1–120

probes : Number of times a traceroute is performed to locate the IPv6 device at any hop in the route to the specified host before the operation times out. Default: 3; Range: 1–5

[source <ipv6–addr|vid>] : The source IPv6 address or VLAN of the traceroute device or the VLAN-ID on which the traceroute packet is being sent.

[dstport <1-34000>] : Destination port.

[srcport <1-34000>] : Source port.

IPv6 traceroute probes

Switch# traceroute6 2001:db8::10
traceroute to 2001:db8::10
      1 hop min, 30 hops max, 5 sec. timeout, 3 probes
 1 2001:db8::a:1c:e3:3           0 ms   0 ms   0 ms
 2 2001:db8:0:7::5               7 ms   3 ms   0 ms
 3 2001:db8::214:c2ff:fe4c:e480  0 ms   1 ms   0 ms
 4 2001:db8::10                  0 ms   1 ms   0 ms

First three hops: Intermediate router hops with the time (in milliseconds) for the switch to receive a response from each of the three probes sent to each router.

Last hop: Destination IPv6 address 

Switch# traceroute6 2001:db8::10 maxttl 7
traceroute to fe80::1:2:3:4
      1 hop min, 7 hops max, 5 sec. timeout, 3 probes
1 2001:db8::a:1c:e3:3           0 ms   0 ms   0 ms
2 2001:db8:0:7::5               0 ms   0 ms   0 ms
3 * 2001:db8::214:c2ff:fe4c:e480 *
4 * * *
5 * * *
6 * * *
7 * * *

At hop 3, the first and third probes timed out, but the second probe reached the router. Each timed-out probe is displayed with an asterisk (*).

The four remaining probes within the configured seven-hop maximum (maxttl) also timed out without finding a next-hop router or the destination IPv6 address.