Method for Preventing Ip Multicast Data Stream to Overload Communication System by Distinguishing All Kinds of Services

A method for preventing IP multicast data stream from overloading communication system by distinguishing multiple services, comprising the following steps of:

• (b1) generating a multicast route entry M(key) by a protocol layer according to a protocol state machine, performing the next step if the entry is set with an up-sending flag ‘Upsend’;
• otherwise, synchronizing the M(key) to a forwarding layer, generating or updating a forwarding route list, entering into a normal route forwarding flow, and ending a multicast flow control;
• (b2) searching for a current-limiting policy corresponding to the key in configured multicast current-limiting policies by the protocol layer, applying the current-limiting policy searched to the M(key) to form P_M(key) attached with the current-limiting policy, then synchronizing it to the forwarding layer;
• (b3) if a matching multicast route entry is found when the forwarding layer receives the multicast data packet ‘packet(key)’, and if the forwarding requirements are satisfied, then first forwarding the ‘packet(key)’, and achieving current limit for up sending the multicast data packet P_M(key) to the protocol processor according to the current-limiting policy of the multicast data packet P_M(key).

A method for preventing IP multicast data stream from overloading communication system by distinguishing multiple services, comprising the following steps of:

• (d1) a multicast data packet ‘packet(key)’ with a key value of ‘key’ reaching a forwarding layer, the forwarding layer deciding whether a matching forwarding route can be found;
• if yes, performing the next step, otherwise, performing step (d8);
• (d2) judging whether forwarding conditions are satisfied, if yes, the forwarding layer first entering a normal forwarding flow to forward the ‘packet(key)’, then performing the next step;
• otherwise, performing step (d6);
• (d3) judging whether a protocol requires up sending the multicast data packet ‘packet(key)’ to a protocol processor, if yes, up sending the ‘packet(key)’ to a protocol layer by the forwarding layer, and performing the next step;
• otherwise, not performing current limiting, ending;
• (d4) the protocol layer receiving the multicast data packet ‘packet(key)’ up sent by the forwarding layer, and driving a protocol state machine to generate a new multicast route entry M(key), if the M(key) is set with an up-sending flag ‘Upsend’, performing the next step;
• otherwise, synchronizing the M(key) to the forwarding layer, then the forwarding layer forwarding the received multicast data packet ‘packet(key)’ according to the new multicast route entry M(key), ending;
• (d5) the protocol layer searching a current-limiting policy corresponding to the ‘key’ under this condition and applying it to the M(key) so as to obtain P_M(key) attached with the current-limiting policy, then synchronizing the P_M(key) to the forwarding layer, said forwarding layer achieving current limiting for up sending the multicast data packet ‘packet(key)’ to the protocol processor according to the current-limiting policy of the P_M(key), ending;
• (d6) judging whether the requirements of an assert mechanism state machine of a multicast protocol are satisfied, if yes, performing the next step;
• if not, discarding the multicast data packet ‘packet(key)’, ending;
• (d7) using a preset assert mechanism current-limiting policy in the forwarding layer, if the policy requires up sending the ‘packet(key)’ to the protocol processor, up sending the data packet ‘packet(key)’, generating a new multicast route entry according to the protocol state machine and synchronizing it to the forwarding layer by the protocol layer, then performing forwarding and up-sending according to this entry by the forwarding layer, ending;
• if the policy does not require up-sending, shielding the multicast data packet ‘packet (key)’, ending;
• (d8) up sending the multicast data packet ‘packet (key)'to the protocol processor, driving the protocol state machine to generate a new multicast route forwarding entry by the protocol layer;
• meanwhile, searching a current-limiting policy corresponding to the ‘key’ under this condition by the forwarding layer, generating a temporary forwarding route entry T_M(key), and limiting the current of subsequent multicast data packets ‘packet (key)’ according to this entry;
• (d9) synchronizing the new multicast route forwarding entry to the forwarding layer if it is generated, using this entry to update the T_M(key) by the forwarding layer, and entering the normal forwarding flow, ending;
• continuing to limit current by the forwarding layer according to the current-limiting policy attached to the T_M(key) if the M(key) can not be generated, and deciding when to end the current limiting according to the policy.