Spectrum model activation hanging on Multicast models (Legacy KB ID CNC TS33626 )

Document ID : KB000051884
Last Modified Date : 14/02/2018
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This issue will be addressed in Spectrum The following is the Release Note reference:

Symptom:The Multicast Manager may cause activation on startup to be delayed with the McastIHPerfCtrl handler causing the delays.

Resolution: The Multicast handlers will stop sending so many SNMP packets to devices that are down on startup.  There should no longer be such a long activation delay on startup.

Related Issues/Questions:
Spectrum model activation hanging on Multicast models

Problem Environment:
Model Activation
Multicast Manager

When mdlact_debug=true is added to the $SPECROOT/SS/.vnmrc file, the following is seen in the $SPECROOT/SS/VNM.OUT file (the model handle may be different):


Model 200030 is calling class McastIHPerfCtrl


Causes of this problem:
On SpectroSERVER startup, McastIHPerfCtrl sends an action to McastIHPerfCol which causes probe packets to be sent to devices. Some groups in the database have over 50 sources. Each source may send 2 packets since two types of probes are tried (if the first one fails). On devices that are down, this could be over a hundred packets for one Multicast group alone. The SNMP timeout and retries thus cause at least a 9 second delay per probe and this could be over a 1000 seconds for just one group.

(Legacy KB ID CNC TS33626 )