Ravindra_Katrag,
you can use priotity queues Firewall Priority Queues in R77.30 / R80.10 and above
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Packets could be dropped by Firewall when CPU cores, on which Firewall runs, are fully utilized. Such packet loss might occur regardless of the connection's type (for example, local SSH or connection to Security Management Server server).
To help mitigate the above issue, Firewall Priority Queues feature was introduced in R77.30 Security Gateway.
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or if your gateway has enough CPUs you can use the new management plane feature in R80.30 to separate the .
See this thread from Danny New! R80.30 feature: Management Data Plane Separation (for gateways with 8+ cores)
Wolfgang