A method for implementing multicast includes: receiving or generating an internet group management protocol IGMP packet; judging whether the packet is a first join packet or a last leave packet of a multicast group, and adding an identifier indicating whether the IGMP packet is a first join packet or a last leave packet of a multicast group to the IGMP packet, where the identifier is used for a subsequent entity not to perform multicast processing on the IGMP packet when judging that the IGMP packet is not the first join packet or the last leave packet of the multicast group according to the identifier; and forwarding the IGMP packet to the subsequent entity. Therefore, the packet processing pressure on the network apparatus is relieved, and meanwhile, the IGMP packet requirements in the practical network are met.

Method, device and system for implementing multicast

Building method of multicast forwarding path and route equipment

The invention discloses a unified electoral method of a PIM-SM (Protocol Independent Multicast-Sparse Mode) designated router and an IGMP (Internet Group Management Protocol) querier. According to the unified electoral method, roles of a main router in a VRRP (Virtual Router Redundancy Protocol) in the same network are introduced as reference basis in the process of electing the designated router in a PIM-SM and the querier in an IGMP, namely, the states of the designated router in the PIM-SM and the querier in the IGMP are the same as the state of the main router in the VRRP respectively, and when the state of the main router in the VRRP changes, the designated router in the PIM-SM and the querier in the IGMP are subjected to state switching synchronously. Therefore, the problem that multicast traffic cannot be correctly forwarded in the multicast because of inconformity of the designated router in the PIM-SM and the querier in the IGMP in the same network is solved, and meanwhile, the electron and switching speeds of the designated router in the PIM-SM and the querier in the IGMP are also improved.

Unified electoral method of PIM-SM (Protocol Independent Multicast-Sparse Mode) designated router and IGMP (Internet Group Management Protocol) querier

The invention discloses a host routing table entry generating method and device. According to the host routing table entry generating method and device, when an ARP request message sent by a terminal is received, a host routing table entry is directly generated according to authentication information saved by the terminal during authentication. Compared with the prior art that a host routing table entry is generated according to an ARP table entry after an ARP request message is verified by an ARP monitoring table entry, the host routing table entry generating method and device have the advantage that resource consumption can be reduced.

Host routing table entry generating method and device

The invention relates to an address resolution protocol (ARP) table entry management method and a three-layer exchanger. The method comprises that: before the time of the aging of the ARP table entry, the three-layer exchanger broadcast an ARP request according to the ARP table entry in a sub virtual local area network (Subvlan) corresponding to the ARP table entry; and if receiving an ARP response, the three-layer exchanger updates the corresponding ARP table entry or aging the ARP table entry before the aging time. The ARP table entry management method and the three-layer exchanger can improve the utilization rate of a central processing unit (CPU).

Address resolution protocol (ARP) table entry management method and three-layer exchanger

The invention discloses a method of two layers cross-network segment communication, a system and a device. The method is used in a network including a first router equipment and a second router equipment, the first router equipment and the second router equipment are mutually a home agent and a foreign agent; the first router equipment locates in a first network, a first terminal in the first network accesses with a public network; the second router equipment locates in a second network, a second terminal in the second network accesses with the public network through the second router equipment. The router equipment as foreign agent collects local terminal equipment information by intercepting free ARP requirement, and processes router register to the home agent. The method can realize different place two layers cross-network segment communication simply by using the method of the mobile IP router register and mobile IP chunnel transfer. The method has wide suitable range and has not strict requirement to the middle network.

Two-layer cross-network segment communicating method, system and equipment

The invention discloses an IGMP message transmitting method comprising that an IGMP agent device receives IGMP adding messages from a host; the IGMP agent device obtains the multicast source address corresponding to the IGMP adding messages, searches a uni-cast routing table of itself according to the multicast source address to obtain an outgoing interface of the next hop; if the outgoing interface is an uplink interface of IGMP, the IGMP agent device sends out the IGMP adding messages through the outgoing interface; if the outgoing interface is not an uplink interface of IGMP, the IGMP agent device selects an interface from the IGMP uplink interfaces of itself and sends out the IGMP adding messages through the selected interface. The invention also discloses an IGMP agent device. The invention avoids rounding of multicast flows and realizes load-sharing between IGMP uplink interfaces.

Packet transmission method and proxy device for Internet group management protocol

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Two-layer cross-network segment communicating method, system and equipment

Packet transmission method and proxy device for Internet group management protocol