Supported Platforms
mtrace from-source
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 11.3 for the QFX Series.
Description
Display trace information about an IP multicast path from a source to this router or switch. If you specify a group address with this command, Junos OS returns additional information, such as packet rates and losses.
Options
brief | detail | — | (Optional) Display the specified level of output. |
extra-hops extra-hops | — | (Optional) Number of hops to take after reaching a nonresponsive router. You can specify a number between 0 and 255. |
group group | — | (Optional) Group address for which to trace the path. The default group address is 0.0.0.0. |
interval interval | — | (Optional) Number of seconds to wait before gathering statistics again. The default value is 10 seconds. |
loop | — | (Optional) Loop indefinitely, displaying rate and loss statistics. |
max-hops max-hops | — | (Optional) Maximum hops to trace toward the source. The range of values is 0 through 255. The default value is 32 hops. |
max-queries max-queries | — | (Optional) Maximum number of query attempts for any hop. The range of values is 1 through 32. The default is 3. |
multicast-response | — | (Optional) Always request the response using multicast. |
no-resolve | — | (Optional) Do not attempt to display addresses symbolically. |
no-router-alert | — | (Optional) Do not use the router-alert IP option. |
response response | — | (Optional) Send trace response to a host or multicast address. |
routing-instance routing-instance-name | — | (Optional) Trace a particular routing instance. |
source source | — | Source hostname or address. |
ttl ttl | — | (Optional) IP time-to-live (TTL) value. You can specify a number between 0 and 255. Local queries to the multicast group use a value of 1. Otherwise, the default value is 127. |
unicast-response | — | (Optional) Always request the response using unicast. |
wait-time wait-time | — | (Optional) Number of seconds to wait for a response. The default value is 3. |
Required Privilege Level
view
List of Sample Output
mtrace from-sourceOutput Fields
Table 1 describes the output fields for the mtrace from-source command. Output fields are listed in the approximate order in which they appear.
Table 1: mtrace from-source 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. |
source | Source address. |
Response Dest | Response destination address. |
Overall | Average packet rate for all traffic at each hop. |
Packet Statistics for Traffic From | Number of packets lost, number of packets sent, percentage of packets lost, and average packet rate at each hop. |
Receiver | IP address receiving the multicast. |
Query source | IP address sending the mtrace query. |
Sample Output
mtrace from-source
user@host> mtrace from-source source 192.1.4.2
group 225.1.1.1 Mtrace from 192.1.4.2 to 192.1.1.2 via group 225.1.1.1
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.
Waiting to accumulate statistics...Results after 10 seconds:
Source Response Dest Overall Packet Statistics For Traffic From
192.1.4.2 192.1.1.2 Packet 192.1.4.2 To 225.1.1.1
v __/ rtt 2 ms Rate Lost/Sent = Pct Rate
192.1.2.1
192.1.3.2 routerC.lab.mycompany.net
v ^ ttl 2 0/0 = -- 0 pps
192.1.4.1
192.1.2.2 routerB.lab.mycompany.net
v \__ ttl 3 ?/0 0 pps
192.1.1.2 192.1.1.2
Receiver Query Source
