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JunosE 11.3.x Multicast Routing Configuration Guide
Investigating Multicast Routes
mtrace
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You can use the mtrace command to trace the path that multicast packets take from a
source to a destination through a multicast group address. This command is similar to
the traceroute command for investigating unicast routes.
Use to trace the path that multicast packets take to a destination.
Specify the unicast IP address of the source for the packets.
To direct the packets to a particular destination, specify the unicast address for that
destination. If you do not specify a destination, the router traces the route from the
device on which you issue the command.
To direct the packets through a particular multicast group address, specify that
multicast group address. If you do not specify a multicast group address, the router
traces the route through the MBone audio multicast group.
To send the trace to a particular device, specify the IP address of that device. If you do
not specify a response address, the router sends the trace to an IP address on the
router.
To investigate a problem at a particular point in the route, specify the maximum number
of hops for the trace. The default number of hops is 64.
The trace starts at the destination and works back to the source.
Field descriptions
Tracing multicast route from a.a.a.a to b.b.b.b for group c.c.c.c using response address
d.d.d.d—A description of the trace is as follows:
a.a.a.a—IP address of the source
b.b.b.b—IP address of the destination
c.c.c.c—IP address of the multicast group
d.d.d.d—IP address of the router to which the router sends the trace
Received mtrace response packet of length n—Length of the response packet, in
bytes
Each line of the trace has the following format: hops. ip-address Protocol: protocol
FwdingCode:forwarding code
hops—Number of hops from the destination to this intermediate router
ip-address—IP address of the intermediate router
Copyright © 2010, Juniper Networks, Inc.
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