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# traceroute

#### Syntax

traceroute [ vrf vrfName ] destination [ ttl maxTTLCount ]
[ timeout timeOutVal ] [ data-size sizeValue ]
[ source { interface interfaceType interfaceSpecifier | address sourceAddress } ]
[ extended [ tos tosVal ] [ set-dont-fragment-bit ] [ interface iType iNumber ]

traceroute ipv6 [ vrf vrfName ] destination [ hop-limit hopLimit ]
[ timeout timeOutVal ][ data-size sizeValue ] [ source { interface interfaceType interfaceSpecifier |
address sourceAddress } ] [ extended [ dscp trafficClass ] [ flow-label flowLabel ] ]

#### Release Information

Command introduced before JUNOSe Release 7.1.0.
vrf keyword and vrfName variable added to IPv6 version in JUNOSe Release 7.2.0.

#### Description

Discovers the paths that router packets follow when traveling to their destinations. There is no no version.

#### Options

- vrfName—Name of the VRF context; string of 1–32 alphanumeric characters
- ipv6—Specifies the destination address as IPv6 format
- destination—IP address, IPv6 address, or domain name of the trace
- hopLimit—Maximum number of hops of the trace in the range 1–255; default value is 32
- maxTTLCount—Maximum number of hops of the trace in the range 1–255; default value is 32
- timeOutVal—Time in seconds to wait for trace responses in the range 1–20; default value is 2
- sizeValue—Number of bytes comprising the IP packet and reflected in the IP header in the range 0–64000
- source interface—Specifies an interface as the source for the transmitted packets
  - interfaceType—Interface type; see Interface Types and Specifiers
  - interfaceSpecifier—Particular interface; format varies according to interface type; see Interface Types and Specifiers
- source address—Specifies an IP address as source for the transmitted packets
  - sourceAddress—IP address or domain name used as the source address
- extended—Specifies extended IP header attributes
  - tosVal—Value of the ToS byte
  - set-dont-fragment-bit—Specifies the don’t-fragment bit
  - iType—Interface type
  - iNumber—Interface location
  - trafficClass—Specifies the traffic class value to match in the Traffic Class field of each IPv6 packet header, in the range 1–255
  - flowLabel—Specifies the flow label value to match in the Flow Label field of each IPv6 packet header, in the range 1–1048576

#### Mode

Privileged Exec, User Exec

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