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mtrace

Syntax

mtrace source<logical-system logical-system-name><routing-instance routing-instance-name>

Release Information

Command introduced before Junos OS Release 7.4.

Command introduced in Junos OS Release 9.0 for EX Series switches.

Command introduced in Junos OS Release 9.5 for SRX1400, SRX3400, SRX3600, SRX5600, and SRX5800 devices.

Command introduced in Junos OS Release 11.3 for the QFX Series.

Command introduced in Junos OS Release 12.3 for the PTX Series.

Description

Display trace information about an IP multicast path.

Options

source

Source hostname or address.

logical-system (logical-system-name)

(Optional) Perform this operation on a logical system.

routing-instance routing-instance-name

(Optional) Trace a particular routing instance.

Additional Information

The mtrace command for multicast traffic is similar to the traceroute command used for unicast traffic. Unlike traceroute, mtrace traces traffic backwards, from the receiver to the source.

Required Privilege Level

view

List of Sample Output

mtrace source

Output Fields

Table 1 describes the output fields for the mtrace command. Output fields are listed in the approximate order in which they appear.

Table 1: mtrace Output Fields

Field Name

Field Description

Mtrace from

IP address of the receiver.

to

IP address of the source.

via group

IP address of the multicast group (if any).

Querying full reverse path

Indicates the full reverse path query has begun.

number-of-hops

Number of hops from the source to the named router or switch.

router-name

Name of the router or switch for this hop.

address

Address of the router or switch for this hop.

protocol

Protocol used (for example, PIM).

Round trip time

Average round-trip time, in milliseconds (ms).

total ttl of

Time-to-live (TTL) threshold.

Sample Output

mtrace source

user@host> mtrace 192.1.4.2
Mtrace from 192.1.4.2 to 192.1.1.2 via group 0.0.0.0
Querying full reverse path... * * 
  0  routerA.lab.mycompany.net (192.1.1.2)
 -1  routerB.lab.mycompany.net (192.1.2.2)  PIM  thresh^ 1  
 -2  routerC.lab.mycompany.net (192.1.3.2)  PIM  thresh^ 1  
 -3  hostA.lab.mycompany.net (192.1.4.2)
Round trip time 2 ms; total ttl of 2 required.

Published: 2014-07-23

Published: 2014-07-23