Juniper JUNOSE 11.0.X MULTICAST ROUTING, Configuration Manual

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Use the no version to set the port number to the default value.
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See udp-port
SNMP Traps and System Log Messages
The router can send Simple Network Management Protocol (SNMP) traps to alert
network managers when:
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A RADIUS server fails to respond to a request.
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A RADIUS server that previously failed to respond to a request (and was
consequently removed from the list of active servers) returns to active service.
Returning to active service means that the E Series RADIUS client receives a
valid response to an outstanding RADIUS request after the server is marked
unavailable.
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All RADIUS servers within a VR context fail to respond to a request.
The router also generates system log messages when RADIUS servers fail to respond
or when they return to active service; no configuration is required for system log
messages.
SNMP Traps
The router generates SNMP traps and system log messages as follows:
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If the first RADIUS server fails to respond to the RADIUS request, the E Series
RADIUS client issues a system log message and, if configured, an SNMP trap
indicating that the RADIUS server timed out. The E Series RADIUS client will not
issue another system log message or SNMP trap regarding this RADIUS server
until the deadtime expires, if configured, or for 3 minutes if deadtime is not
configured.
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The E Series RADIUS client then sends the RADIUS request to the second
configured RADIUS server. If the second RADIUS server fails to respond to the
RADIUS request, the E Series RADIUS client again issues a system log message
and, if configured, an SNMP trap indicating that the RADIUS server timed out.
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This process continues until either the E Series RADIUS client receives a valid
response from a RADIUS server or the list of configured RADIUS servers is
exhausted. If the list of RADIUS servers is exhausted, the E Series RADIUS client
issues a system log message and, if configured, an SNMP trap indicating that all
RADIUS servers have timed out.
If the E Series RADIUS client receives a RADIUS response from a “dead” RADIUS
server during the deadtime period, the RADIUS server is restored to active status.
If the router receives a valid RADIUS response to an outstanding RADIUS request,
the E Series client issues a system log message and, if configured, an SNMP trap
indicating that the RADIUS server is now available.
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Configuring RADIUS Authentication and Accounting Servers
JUNOSe 11.0.x Broadband Access Configuration Guide