mtrace from-source
Syntax
mtrace from-source source source <brief | detail> <extra-hops extra-hops> <group group> <interval interval> <loop> <max-hops max-hops> <max-queries max-queries> <multicast-response | unicast-response> <no-resolve> <no-router-alert> <response response> <routing-instance routing-instance-name> <ttl ttl> <wait-time wait-time>
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
Output 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.
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 192.168.4.2 group 233.252.0.1
Mtrace from 192.168.4.2 to 192.168.1.2 via group 233.252.0.1
Querying full reverse path... * *
0 routerA.lab.mycompany.net (192.168.1.2)
-1 routerB.lab.mycompany.net (192.168.2.2) PIM thresh^ 1
-2 routerC.lab.mycompany.net (192.168.3.2) PIM thresh^ 1
-3 hostA.lab.mycompany.net (192.168.4.2)
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
192.168.4.2 192.168.1.2 Packet 192.168.4.2 To 233.252.0.1
v __/ rtt 2 ms Rate Lost/Sent = Pct Rate
192.168.2.1
192.168.3.2 routerC.lab.mycompany.net
v ^ ttl 2 0/0 = -- 0 pps
192.168.4.1
192.168.2.2 routerB.lab.mycompany.net
v \__ ttl 3 ?/0 0 pps
192.168.1.2 192.168.1.2
Receiver Query Source
Release Information
Command introduced before Junos OS Release 7.4.