3Com 3500 - page 528

528 CHAPTER 18: IP MULTICAST
ip multicast
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traceRoute
For CoreBuilder 9000: Applies to Layer 3 switching modules only.
Provides a method for tracing the path that an IP multicast packet takes
from a source to a particular receiver. Unlike unicast IP traceroute,
multicast traceroute works in the reverse and requires a special packet
type and implementation in routing devices.
Valid Minimum Abbreviation
ip m t
Important Considerations
■This command traces the path backwards from a specific receiving
device to a specific source device. When you use this command, the
receiver is assumed to be the system to which yo u are connected.
■This command produces a display that shows IP addresses o f the
interfaces that sp an from your system back to the source th at you
specify. The display also shows the number of hops back to those
interfaces, the multicast routing protocols used, and the am ount of
time it takes to reach each hop from the receiver.
■All interim devices must support IP multicast tracerout e for you to see
a complete path on the display.
Options
Prompt Description Possible Values [Default]
source IP
address
IP address of the source device
that sends traffic to a specific IP
multicast group address
Any valid IP address
for IP multicast
source devices in
your network
–
multicast
group
address
The IP multicast group address
that the source is using for a
particular application. This is
useful when all applications
come from the same source.
Any valid IP
multicast group
address used by
source devices in
your network
–