Administrator Guide

Layer 3 Routing Commands 1591
• interval—The time (in seconds) between successive echo requests.
Default 3.
• init-ttl—The initial TTL sent in the ICMP echo request packets (Range 1-
255. Default 1).
• max-ttl—The maximum ttl sent in the ICMP echo request packet (Range
1-255, default 30). Must be equal to or larger than init-ttl.
• port—The destination UDP port of the probe. (Range 1-65535).
• size—The packet size padding in bytes. (Range 0-39936, default 0).
• source—Use the specified source IP address, loopback address, VLAN
address, tunnel or out-of-band interface address in the transmitted
packets.
Default Configuration
There is no default configuration for this command.
Command Mode
Privileged Exec and User Exec modes
User Guidelines
Traceroute operates by sending a sequence of Internet Control Message
Protocol (ICMP) echo request packets. The time-to-live (TTL) value, is used
in determining the intermediate routers through which the packet flows
toward the destination address. Routers decrement a packet’s TTL value and
discard packets whose TTL equals 0. On discarding a packet, the router
returns an ICMP time exceeded message to the source.
Example
(console)# traceroute ipv6 2001::2 init-ttl 1 max-ttl 4 max-fail 0 interval 1
count 3 port 33434 size 43
Traceroute to 2001::2, 4 hops max, 43 byte packets:
1 2001::2 708 msec 41 msec 11 msec
2 2001::2 12 msec 13 msec 12 msec
3 2001::2 14 msec 9 msec 11 msec