PGM Configuration Guidelines

Pragmatic General Multicast (PGM) allows the router to participate in defined PGM router assistance functions between PGM-enabled sources and receivers. Although PGM is a transport layer protocol and is not directly concerned with IP packet routing, PGM must be explicitly configured on the router.

To enable PGM globally on the router, include the pgm statement:

pgm;

You can include this statement at the following hierarchy levels:

[edit protocols]
[edit logical-systems logical-system-name protocols]

To trace the operation of PGM, include the traceoptions statement:

traceoptions {flag flag <flag-modifier>;}

You can include this statement at the following hierarchy levels:

[edit protocols pgm]
[edit logical-systems logical-system-name protocols pgm]

You can specify the following PGM-specific options in the flag statement:

all—Trace all PGM packets.
init—Trace all PGM initialization events.
packets—Trace all PGM packet processing.
parser—Trace all PGM parser processing.
route-socket—Trace all PGM route-socket events.
show—Trace all PGM show command servicing.
state—Trace all PGM state transitions.

For an overview of logical systems and a detailed example of logical system configuration, see the Junos Logical Systems Feature Guide.

By default, PGM is enabled on every interface of the router, but global, explicit configuration is required. No options are available for PGM operation.