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mtrace
Command Mode
Description
Syntax
Sample Output
Systems
Document No. 10-300090, Issue 1
Privileged.
Traces the path from a source to a destination branch for a multicast
distribution tree. The trace follows the multicast path from the destination to
the source by passing an mtrace request packet to each hop. The responses
are unicast to the querying router by the first hop router to the source. The
mtrace command is helpful in isolating multicast routing failures.
mtrace <source> [<destination>] [<group>]
Table 9-7. Parameters, Keywords, Arguments
Name
Definition
<source>
The IP address of the Multicast Capable source. This is a unicast
address that represents the beginning of the path to be traced.
<destination>
The IP address of the unicast destination. If omitted, the trace
starts from the system at which the command is typed.
<group>
The Multicast Address of the group address to be traced. The
default address is: 224.2.0.1. (The group used for MBONE
audio.)
The following example traces the path from a source (10.0.2.129) to a
destination (10.0.4.77) branch for a multicast destination tree (255.0.1.1).
# mtrace 10.0.2.129 10.0.4.177 255.0.1.1
OutIntf
InIntf
-1
10.0.6.96, 10.0.5.96 DVMRP
-2
10.0.5.95, 10.0.1.95 DVMRP
-3
10.0.2.63, 10.0.1.63 DVMRP
Round trip time 0 ms
P550R, P580, P880, and P882.
Port
Fwd
thresh^32
thresh^32
thresh^32
IGMP
TTL
0 ms
1391000 ms
2054500 ms
9-13
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