If the IGMPStaticForwarding Policy mode is set to static
to dynamic (static inbound and multicast protcol outbound)
mode. This value should be set based on which protcols are
planned to be configured on the outbound. Typical values
are for DVMRP(7200), MOSPF(600) and PIM(210) so that MTM
cache entries will be alive for the above specified
seconds even if the traffic is not present.
The above value is in seconds.