The value of tmnxMsdpMsgRcvRateTime specifies the time in seconds
that together with tmnxMsdpMsgRcvRate defines the number of MSDP
messages (including source active messages) that are read from the
TCP session within the configured number of seconds.
By default, no MSDP messages are read from the TCP session
and this is specified by the value 0.
Once the number of MSDP packets defined in tmnxMsdpMsgRcvRateThd
have been processed the rate of all other MSDP packets is rate
limited by no longer accepting messages from the TCP session until
tmnxMsdpMsgRcvRateTime seconds have elapsed.