CN111711570A

CN111711570A - Method for realizing multicast protocol in network equipment

Info

Publication number: CN111711570A
Application number: CN202010531521.5A
Authority: CN
Inventors: 武斌
Original assignee: Xinhe Semiconductor Technology Wuxi Co Ltd
Current assignee: Xinhe Semiconductor Technology Wuxi Co Ltd
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2020-09-25

Abstract

The invention discloses a method for realizing a multicast protocol in network equipment, which comprises the following steps: s1, the pon chip transparently transmits the uplink igmp message to the upstream exchange chip, and the exchange chip extracts the igmp message to the cpu for processing; an igmp message transparent transmission configuration interface in the Pon chip is opened as an sdk api interface; s2, opening a multicast vlan table and a source ip address filtering table in the pon chip through sdk api; s3, the whole pon chip also realizes the function of igmp snooping similarly. The invention can reduce the running number of the multicast protocols and the number of imgp proxy protocol downlink interfaces in a specific network, reduce the burden of network equipment and improve the efficiency of protocol processing. For a chip manufacturer only providing the sdk scheme, the method can be well butted with an integrator, and the realization freedom of a developer is improved.

Description

Method for realizing multicast protocol in network equipment

Technical Field

The invention relates to the technical field of network equipment multicast protocols, in particular to a method for realizing a multicast protocol in network equipment.

Background

The Igmp protocol is used for establishing and maintaining the relationship between multicast group members between an ip host and a multicast router directly adjacent to the ip host. In a simple tree network, an edge device does not need to run a complex multicast routing protocol, and an igmpproxying (igmp proxy) can be configured on the device, so that the igmp proxy can proxy a downstream host to send an igmp message and maintain the relationship between group members. From the perspective of the upstream device, the device configured with igmpproxying is no longer a PIM neighbor, but a host.

An uplink interface: an interface for running the igmpproxying function, and a host interface.

A downlink interface: the router interface is the interface for running the igmp protocol except the uplink interface.

A group member relation database is maintained on the igmp proxy device, and group member relations maintained by all downlink interfaces are recorded in the database. (multicast-address, filter-mode, source-list), each record is a collection of membership relationships with the same group address on each downlink interface.

The uplink interface executes host behavior according to the database, and when receiving a query message, the uplink interface responds to a report message according to the current database state, or actively sends a report or leaves the message when the database changes; the downlink interface executes the router behavior, participates in the election of the querier, sends the query message and maintains the group member relationship according to the report message.

The igmpspooping analyzes the received igmp message, establishes a mapping relation for the port and the multicast address, and forwards the multicast data according to the mapping relation. And no snooping is operated, multicast data is broadcasted at the second layer, and only multicast to a specified receiver after operation.

igmpsnooping runs in two layers. And only when an igmp leaving message of a certain port is received or an aging time timer of a certain port is overtime, an igmp specific group query message is actively sent to the port.

The igmpssnooping monitors an igmp protocol packet, extracts corresponding information and forms a multicast membership table. Transparent to the router and the host.

A distinction between igmpproxy and igmpsnooping.

The igmpsnooping acquires the related information only by intercepting the message of the igmp, and the igmpproxy intercepts the igmp request of the interrupt user and performs related processing, and then forwards the igmpsnooping to the upper layer router. Therefore, the corresponding relation between the group member and the switch interface is formed in the igmpsnooping, and the multicast routing table is formed in the igmpproxy.

In many edge devices, for example olt, there are generally a switch chip on the upper port side and a pon chip on the lower port side at the same time, both ends will process multicast protocols at the same time, there are two sets of multicast protocol processes, resources of network devices are occupied, and the efficiency of multicast protocols is affected. Moreover, for the chip vendor providing the sdk solution, the customer feels the trouble of docking and maintaining two sets of functionally similar multicast protocol codes simultaneously.

Disclosure of Invention

The present invention is directed to provide a method for implementing a multicast protocol in a network device, so as to solve the problems set forth in the foregoing background art.

In order to realize the purpose, the invention integrates the multicast protocols of two chips into a CPU for processing; only one set of multicast protocols is operated in the cpu of the chip A; the ports of the uplink A1, the uplink A2 … … and the like are igmpproxying host interfaces, and the port of the downlink A4 is an igmpproxying routing interface; ports such as B1, B2, B3 and B4 are igmpspooping interfaces.

A realization method of multicast protocol includes the following steps:

s1, the pon chip transparently transmits the uplink igmp message, records a receiving port of the igmp in a lead code of the igmp message, transmits the igmp message to an upstream exchange chip, and the exchange chip extracts the igmp message to a cpu for processing; an igmp message transparent transmission configuration interface in the Pon chip is opened as an sdkapi interface;

s2, opening a multicast vlan table and a source ip address filtering table (through the table) in the pon chip through sdkapi;

s3, the whole pon chip also realizes the similar igmpspooping function of a variant; the cpu of the chip A receives an igmp message of an A4 port, processes the igmp message according to an igmpsnooping protocol, sets to join or leave a multicast group according to message contents (a multicast mac address, a receiving port, a multicast ip address, a source ip address, a vlan and the like), and is realized by configuring a multicast table of the chip B;

s4, only one igmpproxy downlink interface needs to be maintained in the network equipment, and all the pon ports can be sent to the bridge port of the same exchange chip through the uplink port of the pon chip; for a 16 port olt device, for example, the number of downstream interfaces, i.e., router interfaces, is reduced from 16 to 1.

S5, the configuration of the interface can adopt direct configuration, and can also adopt a method of message queue communication among multiple processes.

Compared with the prior art, the invention has the advantages that: in a specific network, in the same device, the number of IGMP proxying routing interfaces is reduced through the cooperation of IGMP proxying and IGMP snooping, the running number of multicast protocols is reduced, the consumption of resources is reduced, the burden of network equipment is reduced, and the efficiency of protocol processing is improved; in addition, for a chip manufacturer only providing the sdk scheme, the chip manufacturer can be well butted with an integrator, the realization freedom degree of a developer is improved, and meanwhile, the development efficiency is improved.

Drawings

Fig. 1 is a schematic diagram of a multicast protocol interface.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

In the device of fig. 1 and olt, the switch chip and the pon chip are controlled by different cpus, and a set of multicast protocols run on each cpu. The external ports represented as uplink ports A1, A2 … … and the like are igmpproxying host interfaces, and the ports represented as downlink ports B1, B2 … … and the like are igmpproxying routing interfaces. For a larger number of pons, more igmpproxying routing ports are configured, and the device load is larger. And maintaining two sets of multicast protocols simultaneously can increase the difficulty of maintenance and waste of storage and cpu resources.

The invention concentrates the multicast protocols of two chips into one CPU for processing. Only one set of multicast protocols is run in the cpu of chip a. The ports of the uplink A1, the uplink A2 … … and the like are igmpproxying host interfaces, and the port of the downlink A4 is an igmpproxying routing interface. Ports such as B1, B2, B3 and B4 are igmpspooping interfaces.

The specific implementation process comprises the following steps:

1. the chip B transparently transmits the uplink igmp message, records receiving ports B1, B2 and B3 of the igmp in a lead code of the igmp message, transmits the igmp message to the upstream chip A, and extracts the igmp message to a cpu for processing; and an igmp message transparent transmission configuration interface in the chip B is opened as an sdkapi interface.

2. The multicast vlan table and the source ip address filter table in chip B are opened by sdkapi.

3. The whole chip B also realizes the igmpsnooping function of a variant similarly; the cpu of the chip A receives an igmp message from an A4 port, processes the igmp message according to an igmpsnooping protocol, sets to join or leave a multicast group according to the content of the message, and realizes the igmp message by configuring a multicast table of the chip B; the message content is multicast mac address, receiving port, multicast ip address, source ip address, vlan, etc.

4. In the network device, only one igmpproxy downlink interface a4 needs to be maintained, and all interfaces B1, B2 and B3 are sent to the bridge interface a4 of the same chip a through the uplink interface B4 of the chip B.

For a 16 port olt device, for example, the number of downstream interfaces, i.e., router interfaces, is reduced from 16 to 1.

5. The configuration of the interface can adopt direct configuration or adopt a method of message queue communication among multiple processes.

The invention reduces the number of the igmpproxying routing interfaces, reduces the running number of the multicast protocols, reduces the resource consumption and improves the protocol running efficiency by the cooperation of the igmpproxying and the igmpsnooping in the same device

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.

Claims

1. A method for realizing multicast protocol in network equipment is characterized by comprising the following steps:

s1, the pon chip transparently transmits the uplink igmp message, records a receiving port of the igmp in a lead code of the igmp message, transmits the igmp message to an upstream exchange chip, and the exchange chip extracts the igmp message to a cpu for processing; an igmp message transparent transmission configuration interface in the Pon chip is opened as an sdk api interface;

s2, opening a multicast vlan table and a source ip address filtering table in the pon chip through sdk api;

s3, the whole pon chip also realizes the function of igmp snooping similarly; the cpu of the switching chip receives the igmp message of the igmp proxy downlink interface, processes the igmp message according to the igmp snooping protocol, sets the multicast group to join or leave according to the message content, and realizes the join or leave by configuring the multicast table of the pon chip.

2. The method according to claim 1, wherein the packet content is a multicast mac address, a receiving port, a multicast ip address, a source ip address, a vlan, and so on.

3. The method as claimed in claim 1, wherein only one of the igmpproxy downlink interfaces needs to be maintained in the network device.

4. The method of claim 1, wherein all the receiving ports of the pon chip are configured to send to the bridge port of the same switch chip through the uplink port of the pon chip.

5. The method of claim 1, wherein the interface configuration of the pon chip and the switch chip may be direct configuration or communication method of message queue among multiple processes.