
Configuring IP Multicasting and Multimedia Services
B-2 117355-A Rev. A
mtrace
The mtrace command allows you trace the branch of a multicast tree from a
source to a receiver for a particular multicast group. Each branch of the tree is a
data path consisting of multiple hops. Mtrace displays statistics about packet rates
and losses for each hop along the path.
To display Mtrace information, enter the
mtrace command at the Technician
Interface as follows:
mtrace [<
options>
]
<source> <receiver>
[
<group>
]
<options>
= [-e
<extra_hops
> | -g
<gateway
> | -i
<if_addr
> | -M |
-m
<max_hops
>
| -q
<nqueries
> | -r
<resp_dest
> | -s | -S
<statint
> | -t
<ttl
> | -U | -v | -w
<wait
>]
T
able B-1 explains the meanings of each mtrace option in more detail.
Table B-1. Meanings of Mtrace Options
Option Meaning
-e
<extra_hops>
Mtrace tries to trace extra hops past a nonresponding router. The
<extrahops>
value is an integer.
-g
<gateway>
Mtrace sends the trace query via a unicast packet directly to the
multicast router
<gateway>
you specify.
-i
<if_addr>
Mtrace uses
<if_address>
as the local interface address for
sending the trace query and as the default address for the
receiver and the response destination. The
<if_address>
is an IP
address in dotted decimal notation.
-M Mtrace requests the response using a multicast address.
-m
<max_hops>
Mtrace sets to integer the maximum number of hops that are
traced from the receiver back to the source. The default
<max_hops>
value is 32.
-q
<nqueries>
Mtrace sets the maximum number of query attempts to integer.
The default for <nqueries> value is 3.
-r
<resp_dest>
Mtrace sends the trace response to host (that is, the response
destination) rather than to the host on which Mtrace is running,
or to a multicast address other than the one regisitered for this
purpose (224.0.1.32).
-s Mtrace prints a short form output including only the multicast
path and not the packet rate and loss statistics.
(continued)
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