Supported Platforms
mtrace
Syntax
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 sourceOutput 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.
