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mtrace to-gateway

Syntax


            
               mtrace to-gateway gateway gateway             
               
               <brief | detail>
               <extra-hops extra-hops>       
                       
               
               <group group>
               
               <interface interface-name>
               
               <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>
               
               <unicast-response>
               <wait-time wait-time>

Release Information

Command introduced before JUNOS Release 7.4.

Description

Display trace information about a multicast path from this router to a gateway router.

Options

gateway gateway — Send the trace query to a gateway multicast address.

brief | detail — (Optional) Display the specified level of output.

extra-hops extra-hops — (Optional) Number of hops to take after reaching a nonresponsive router. The range of values is 0 through 255.

group group — (Optional) Group address for which to trace the path. The default group address is 0.0.0.0.

interface interface-name — (Optional) Source address for sending the trace query.

interval interval — (Optional) Number of seconds to wait before gathering statistics again. The default value is 10.

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 value 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.

ttl ttl — (Optional) IP time-to-live value. The range of values is 0 through 255. Local queries to the multicast group use TTL 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 to-gateway

Output Fields

Table 30 describes the output fields for the mtrace to-gateway command. Output fields are listed in the approximate order in which they appear.

Table 30: mtrace to-gateway 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.
router-name	Name of the router for this hop.
address	Address of the router 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 to-gateway

user@host> mtrace to-gateway gateway 192.1.3.2
               group 225.1.1.1 interface 192.1.1.73 brief

Mrace from 192.1.1.73 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  routerA.lab.mycompany.net (192.1.1.2)  PIM  thresh^ 1  
 -2  routerB.lab.mycompany.net (192.1.2.2)  PIM  thresh^ 1  
 -3  routerC.lab.mycompany.net (192.1.3.2)  PIM  thresh^ 1  
Round trip time 2 ms; total ttl of 3 required.

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