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the Services Router. The mtrace monitor command monitors and displays multicast
trace operations.
This section contains the following topics. For more information about mtrace
commands, see the JUNOS System Basics and Services Command Reference.
■ Using the mtrace from-source Command on page 241
■ Using the mtrace monitor Command on page 243
Using the mtrace from-source Command
To display information about a multicast path from a source to the Services Router,
enter the mtrace from-source command with the following syntax. Table 124 on page
241 describes the mtrace from-source command options.
user@host> mtrace from-source source host <extra-hops number> <group address>
<interval seconds> <max-hops number> <max-queries number> <response host>
<routing-instance routing-instance-name> <ttl number> <wait-time seconds> <loop>
<multicast-response | unicast-response> <no-resolve> <no-router-alert> <brief |
detail>
Table 124: CLI mtrace from-source Command Options
DescriptionOption
Traces the path to the specified hostname or IP address.
source host
(Optional) Sets the number of extra hops to trace past nonresponsive routers. Specify
a value from 0 through 255.
extra-hops number
(Optional) Traces the path for the specified group address. The default value is 0.0.0.0.group address
(Optional) Sets the interval between statistics gathering. The default value is 10.interval seconds
(Optional) Sets the maximum number of hops to trace toward the source. Specify a
value from 0 through 255. The default value is 32.
max-hops number
(Optional) Sets the maximum number of query attempts for any hop. Specify a value
from 1 through 32. The default value is 3.
max-queries number
(Optional) Sends the response packets to the specified hostname or IP address. By
default, the response packets are sent to the Services Router.
response host
(Optional) Traces the routing instance you specify.
routing-instance
routing-instance-name
(Optional) Sets the time-to-live (TTL) value in the IP header of the query packets. Specify
a hop count from 0 through 255. The default value for local queries to the all routers
multicast group is 1. Otherwise, the default value is 127.
ttl number
(Optional) Sets the time to wait for a response packet. The default value is 3 seconds.wait-time seconds
(Optional) Loops indefinitely, displaying rate and loss statistics. To quit the mtrace
command, press Ctrl-C.
loop
Using CLI Diagnostic Commands ■ 241
Chapter 12: Using Services Router Diagnostic Tools