55 results about "IGMP snooping" patented technology

A network apparatus for forwarding multicast packets to a plurality of multicast receivers includes a switch and a main module. The switch includes a plurality of ports for connecting the plurality of multicast receivers. The main module includes an Internet group management protocol (IGMP) snooping module and a forwarding module. The IGMP snooping module creates several virtual local area networks (VLANs) based on the possible combinations of the plurality of ports, snoops IGMP report messages, determines port identifiers (IDs) of source ports of the IGMP report messages, and establishes a forwarding table according to the VLANs, the IGMP report messages, and the port IDs. The forwarding module adds VLAN tags to multicast packets according to the forwarding table. The switch forwards the multicast packets with the added VLAN tags to corresponding ports according to the VLAN tags. A method for forwarding multicast packets is also disclosed.

The present provides a method of dynamically managing multicast groups and allocating multicast service wavelengths for the highest channel efficiency. According to the present invention, the share indices of wavelengths of all multicast service groups, which employ broadcasting wavelengths and data wavelengths, are periodically ascertained on the basis of IGMP snooping-based technology in a WDM-PON. Based on the ascertainment results, if the channel share index of the group that employs the broadcasting wavelength is smaller than the channel share index of the group that employs the data wavelength, the share index of the wavelength of the multicast group that employs the broadcasting wavelength is maximized by dynamically changing allocation of the wavelength of the multicast group, so that a maximum multicast service can be provided within limited resources.

A switch (110R.3) uses a forwarding database (140F) to forward multicast packets. The switch participates in a multicast protocol (e.g. PIM) with other switches, and also uses a snooping database (e.g. for IGMP snooping) to learn about local group members, i.e. members for which the router serves as a local multicast router (e.g. the local members do not participate in the multicast protocol). When the switch learns of a local member of a multicast group, the switch updates the snooping database but may or may not install the snooping information in the forwarding database. Thus, the forwarding database is not necessarily provisioned for locally sourced data packets addressed to the group until receipt of a locally sourced data packet addressed to the group. If no such packets are received, the forwarding database is not provisioned for such packets, and therefore its size is reduced. Other features are also provided.

A technique for multicast switching in a distributed communication system having a plurality of cooperating modules enables a module to forward multicast packets associated with a multicast stream without using a centralized module or control logic by determining all network interfaces and remote modules associated with the multicast stream and forwarding multicast packets to only those network interfaces and remote modules associated with the multicast stream. IGMP snooping may be used to determine the network interfaces and remote modules associated with the multicast stream, and may also be used to determine host addresses, router addresses, and an IGMP version for each network interface and for each remote module. In order to generate IGMP messages, the module learns a multicast device address from received IGMP messages and uses the multicast device address to send the IGMP messages. The module decides whether to send IGMP version 1 messages or IGMP version 2 messages on a particular interface based upon the IGMP version of IGMP messages received over the interface.

The invention discloses a port configuration method and exchange equipment, wherein the method is applied in an exchange equipment which enables IGMP Snooping, and comprises receiving neighbor information of a link layer discovery protocol LLDP transmitted by a neighbor device through a port, judging whether the neighbor device enables the IGMP Snooping or not according to the LLDP neighbor information received by the port, and doing dynamic router port configuration to the port when the neighbor device enables the IGMP Snooping. The exchange equipment can lead multicast flow to be rapidly contracted through the IGMP Snooping information of an expanded LLDP information carrying device according to an expanded LLED information dynamic configuration router port when network topology is changed, manual configuration of users is avoided under the circumstance that the port is allocated with a plurality of VLANs, and the exchange equipment is convenient to maintain.

The invention discloses a multicast management method and two-layer equipment, which are applied to the two-layer equipment using Internet group management protocol (IGMP) snooping. The two-layer equipment is characterized in that an inquiry port list is set in an IGMP snooping list item on the two-layer equipment. The multicast management method comprises the following steps that: when the two-layer equipment receives IGMP inquiry messages, a port receiving the IGMP inquiry messages is set into an inquiry port; after the two-layer equipment receives the IGMP inquiry messages form the inquiry port, the inquiry port is added into an outlet port list in a corresponding multicast transmitting list item according to multicast addresses required to be added; and the two-layer equipment transmits the received IGMP messages according to the inquiry port and transmits received multicast flows according the multicast transmitting list item. When the multicast management method and the two-layer equipment provided by the invention are adopted, bandwidth resources in the multicast transmitting process are saved.

The invention discloses a device for realizing multicast of an EPON access system and a method thereof. The device comprises an OLT, an ODN and an ONU, wherein a module for operating IGMP Proxy Layer 2 Multicast Protocol is arranged on a main control panel of the OLT; the multicast address list item of the protocol comprises a multicast port, a multicast address and a multicast VLAN; a module for operating IGMP Snooping Layer 2 Multicast Protocol is arranged on the ONU; the multicast address list item of the protocol comprises a multicast port, a multicast address and a multicast VLAN. The invention also provides the method for realizing a multicast message by using the device; the method adopts the IGMP Snooping Layer 2 Multicast Protocol to process the multicast message on the ONU, transparently transmits all multicast messages on a wiring card and adopts the IGMP Proxy Layer 2 Multicast Protocol to process the multicast message on the main control panel, thereby realizing the multicast function of the EPON access system.

A method and switch for Internet Group Management Protocol (IGMP) snooping are disclosed. The method includes: configuring, by a switch, a router interface listed in an IGMP snooping table; configuring, by the switch, a multicast forwarding table entry and a corresponding outgoing interface list; and configuring, by the switch, interfaces which are adjacent to switches in the outgoing interface list. The advantage of the invention is the rapid recovery of the multicast data packets forwarding in the loop network when the network topology of the Layer Two loop network changes.

The invention provides a method for implementing network bridge IGMP snooping based on DSA TAG and a user-defined protocol stack. The method comprises the following steps: a network bridge IGMP Snooping algorithm module constructs the mapping relationship between a network bridge port and the MAC (media access control) addresses of a multicast group by analyzing the received IGMP messages, and forwards a multicasting data according to the mapping relationship; a user-defined data link layer protocol stack as the communication bridge between the network bridge port and a switch chip constructs the corresponding relationship between the network bridge port and the physical port of the switch chip according to the DSA TAG information in the IGMP message; and the switch chip forwards the message to an appointed physical port according to the internal DSA TAG information of the IGMP message and further to multicast members of the multicast group. Based on cooperation and interaction of software and hardware, the method provided by the invention can perfectly implement IGMP Snooping function.

The invention relates to a method for realizing IGMP snooping on a quadri-Ethernet port modem device. The method comprises configuring a control register in a switching module to add redundant information to a retransmitted Ethernet message, wherein the redundant information comprises a receiving port of the message, intercepting and analyzing whether the Ethernet message is an IGMP message or not, if the Ethernet message is the IGMP message, sending the IGMP message by a system to a network drive module which judges the type of the IGMP message, then adding retransmitted information to an IGMP Report message, and deleting retransmitted information to an IGMP Leave message. The IGMP snooping method realized on a quadri-Ethernet port modem device guarantees multicast messages to be retransmitted to an accurate port, thereby effectively avoiding the waste of the bandwidth of exchange chips, reducing the dependency of choosing the exchange chips, increasing the flexibility of selection on the exchange chips for Modem devices factories, and largely reducing the manufacturing cost, simultaneously the working property is stable and reliable, and the application range is relatively wide.

The invention provides a forwarding method and a forwarding device of a multicast data message. The method is applied to a switch supporting the Internet Group Management Protocol IGMP Snooping, and comprises the following steps of: when the multicast data message from a router is received, judging whether a destination MAC address of the multicast data message is matched from a preset layer 2 forwarding table; if so, acquiring the destination MAC address of the multicast data message and an index value of a table item of a multicast VLAN from the layer 2 forwarding table; judging whether the index value of the table item of the destination MAC address of the multicast data message in the layer 2 forwarding table is matched from a preset layer 3 forwarding table; if so, based on the table item corresponding to the index value matched from the layer 3 forwarding table, forwarding the multicast data message. By application of the embodiment of the invention, layer 2 forwarding and layer 3 forwarding are combined together for forwarding the multicast data message, network bandwidth is saved, data transmission efficiency is improved, and load pressure of the router is reduced.

The invention discloses a IP (Internet Protocol) multicasting method of double-layer switching equipment based on a Linux kernel bridge. The method comprises the following steps: a Linux kernel bridge arranged in the double-layer switching equipment monitors an IGMP (Internet Group Management Protocol) message between a host and a route, or maintains multicasting forwarding items of the Linux kernel bridge or a network processor in the double-layer switching equipment according to an IGMP report message or an IGMP leave message; the Linux kernel bridge identifies whether a received data frame is a multicasting message or not, and transmits the multicasting message to a port with group members according to the multicasting forwarding items of the the Linux kernel bridge or the network processor so as to transmit to other messages. According to the method provided by the invention, an IGMP Snooping function is realized through the Linux kernel bridge arranged in the double-layer switching equipment, so that the problem of flooding of multicasting messages in the double-layer switching equipment can be solved. The load of a CPU (Central Processing Unit) is greatly reduced due to flexible configuration, and further the full-bridge IGMP Snooping function of a wired port and a wireless port are realized.

A video overlay system for a Fiber to the Premises (FTTP) optical network. The video overlay is achieved by including a video router with a gigabit Ethernet interface including Internet Group Management Protocol (IGMP) multicasting capability in a headend. The video router transmits unidirectional Internet Protocol video to a plurality of Single Family Unit (SFU) Optical Network Terminations (ONTs) at 1550 nm. The SFU ONTs include IGMP snooping (MxU ONT with multicasting) capability and carry bi-directional control signals from Set Top Boxes (STBs) using 1490 nm downstream and 1310 nm upstream traffic to the headend via an Optical Line Termination (OLT).

The invention provides a data retransmission method and a device. The data retransmission method comprises the following steps: a retransmission port receives a multicasting message for requesting for joining the group, and sets the corresponding relation between the outer layer label and the retransmission port according to the multicasting address of the multicasting message and the identification of the retransmission port; and according to the corresponding relation, the retransmission port corresponding to the outer layer label retransmits data of the multicasting message. The invention overcomes the defect that IGMP Snooping can not normally operate after the equipment port uses QingQ or SVLAN technology in the prior art, so that the multicasting message can be retransmitted normally.

The invention provides an easy-realization bridging method for supporting second-layer multicast forwarding and a router for realizing the method. In the method, IGMP SNOOPING is run on a bridging module, and the IGMP SNOOPING is enabled on a certain designated bridging group through configuration, so the IGMP SNOOPING can acquire the bridging group ID of the bridging group, and an IGMP SNOOPING example is created aiming at the bridging group. When the IGMP SNOOPING is enabled on the bridging groups, the IGMP SNOOPING acquires interfaces of all bridging groups in an ergodic mode and establishes corresponding IGMP SNOOPING interfaces through the interfaces provided by the bridging groups; after the IGMP SNOOPING receives an IGMP message, the IGMP SNOOPING interfaces corresponding to the example ID in a second-layer multicast forwarding table maintained by the IGMP SNOOPING can also find the respectively corresponding bridging group interfaces; and after the second-layer multicast forwarding table is released to the bridging module, the bridging module can generate BMC table entries corresponding to the second-layer multicast forwarding table.

The invention discloses a method and device for processing internet group management protocol (IGMP) Snooping and relates to the technical field of multicast. Accession and departure time delay of IGMP Snooping is remarkably reduced, channel switching time is reduced, and user experience is improved. The method comprises the steps of directly enabling a line card to process indication messages after the line card receives IGMP Snooping enabling and instant departure function starting configuration issued by a main control card and receives the indication messages sent by a mainframe. The method and the device are mainly applied to a processing flow of the IGMP Snooping.

The application discloses a multicast method in an EVI network and an edge device ED. The method comprises the following steps: a designated router port is created for each local VLAN, and correspondence between VLAN and the designated router port is configured to a local IGMP Snooping table; after an EVI message is received, the EVI message is decapsulated to obtain a multicast data message; and according to VLAN information carried in the EVI message, a matching table entry is found from the IGMP Snooping table, the multicast data message is duplicated according to a multicast router port contained in the matching table entry and a multicast member port corresponding to group information, and the duplicated multicast data message is forwarded according to the multicast router port and the multicast member port, wherein if an designated router port exists in the matching table entry and the multicast member port contains EVI-Link ports, the duplicated multicast data message is packaged to an EVI message and the EVI message is forwarded according to each EVI-Link port in the multicast member port during the forward process.