TW201421924A - Method for monitoring packet routing by using layer-2 multicast in passive optical network - Google Patents

Abstract

A method for monitoring packet routing by using layer-2 multicast in passive optical network comprises the following procedures: (A) allocating a layer-2 downstream header translator between a router and a hub, and allocating an upstream header translator on an optical network unit; (B) filtering and accessing a monitoring packet via the layer-2 upstream or downstream header translators, wherein the monitoring packet comprises a destination MAC address; (C) the layer-2 upstream or downstream header translators modifying the destination MAC address of the monitoring packet to a specified layer-2 multicast address; and (D) the layer-2 upstream header translator transmitting the monitoring packet with the specified layer-2 multicast address to the router and a protocol analyzer or the layer-2 downstream header translator transmitting the monitoring packet with the specified layer-2 multicast address to the optical network unit and a protocol analyzer.

Description

Method for monitoring packet transfer using passive layer fiber network in passive optical network

The present invention relates to a method for monitoring packet forwarding using a second layer multicast in a passive optical network.

With the advancement of optical communication network technology, Passive Optical Network (PON) has become the next generation access network technology, providing ultra-high speed and stable network access services. However, with the speed of network transmission, many network management and network security issues have also been extended. For example, the difficulty of network packet monitoring has increased, or the existing equipment has not been able to track records and analyze packets.

Take the Gigabit Passive Optical Network (GPON) 90 as an example. As shown in the fourth figure, it is mainly composed of an Optical Line Terminal (OLT) and an Optical Network Unit 93 (Optical Network). Unit, ONU) and Passive Optical Splitter (POS). Since the data exchanged between the OLT and the ONU is protected by a key encryption, the interception and monitoring of the complete packet cannot be performed from the POS under normal conditions.

US Patent No. 7,450,551 proposes a multicast technology of a Gigabit Passive Optical Network (GPON). U.S. Patent No. 7,639,905 and U.S. Patent No. 7,904,581, respectively, are directed to the application of PON network multicast streaming, and propose a method for rapidly switching channels.

The aforementioned prior art encounters difficulties in monitoring and problems that are too late to record and analyze.

The main purpose of the present invention is to provide a method for monitoring packet forwarding using a second layer multicast in a passive optical network, which can monitor the routing state of the packet through a Layer-2 Multicast architecture. The operation of routing the normal packet to the destination node is completed without causing additional bandwidth requirements of the GPON.

A further object of the present invention is to provide a method for monitoring packet forwarding using a second layer multicast in a passive optical network, which can utilize a second layer multicast technology to route a monitoring packet to a specific node, thereby performing packet processing on the packet. Monitor and track records and analysis.

In order to achieve the foregoing objective, a method for monitoring packet forwarding using a second layer multicast in a passive optical network according to the present invention includes the following steps: A) deploying a second between a router and a hub. Layer down-end head adjuster, whereby the second layer downlink head adjuster can adjust the packet between the router and the hub; and each fiber network unit in a passive optical network (PON) is evenly distributed A second layer upstream head adjuster is configured to enable each of the second layer uplink head adjusters to adjust a packet of the corresponding fiber network unit; B) when a packet is entered by the fiber network unit or When the router enters, the second layer uplink head adjuster or the second layer downlink head adjuster filters and extracts the packet, and extracts a monitoring packet to be monitored, wherein the monitoring Packet Having a destination MAC address; C) the second layer uplink head adjuster or the second layer downlink head adjuster changing the destination MAC address of the monitoring packet to a specific second layer multicast address; and D The second layer uplink head adjuster transmits the monitoring packet with the specific layer 2 multicast address to a OLT (Optical Line Terminal) through a splitter, and then the central end transmits the monitoring packet to the OLT (Optical Line Terminal) a hub, which in turn is transmitted to the router and a protocol analyzer; or the second layer downstream header adjuster transmits the monitoring packet having the specific second layer multicast address to the hub, and then the hub transmits the The protocol analyzer and the central office are further transmitted by the central office through the splitter to a corresponding one of the optical network units.

Preferably, the second layer uplink headend adjuster, the second layer uplink headend adjuster, the protocol analyzer, and the router are used by an Internet Group Management Protocol (IGMP). The specific second layer multicast address is added to receive the monitoring packet transmitted by the second layer uplink head adjuster or the second layer downlink head adjuster.

Preferably, the fiber optic network unit has an uplink portal, and the second layer uplink head adjuster is disposed at the uplink portal.

In order to explain the structure and features of the present invention in detail, the following preferred embodiments will be described with reference to the accompanying drawings, wherein, as shown in the first figure, a preferred embodiment of the present invention provides a passive optical fiber. The network uses the second layer multicast to monitor the packet transfer method. It mainly has the following steps A)~D). The following is an example of Gigabit Passive Optical Network (GPON):

A) a second layer downlink head adjuster 15 is deployed between a router 11 and a hub 13, that is, the router 11 and the hub 13 are electrically connected to the second layer downlink head adjuster 15, Thereby, the second layer downlink head adjuster 15 is adapted to adjust the packet between the router 11 and the hub 13; and each fiber network unit 21 (ONU) in a Gigabit passive optical network 20 is evenly distributed. A second layer upstream head adjuster 25, that is, a second layer uplink head adjuster 25 is electrically connected to a fiber optic network unit 21, thereby causing each of the second layer uplink head adjusters 25 is able to adjust the packet of its corresponding fiber optic network unit 21. In this embodiment, each of the fiber optic network units 21 has an upstream inlet 22, and each of the second layer upstream header adjusters 25 is disposed at an upstream inlet 22 of each of the optical network units 21.

B) When a packet enters or enters by the fiber optic network unit 21, the packet is filtered by the second layer upstream header adjuster 25 or the second layer downstream header adjuster 15 And extracting, and then extracting a monitoring packet to be monitored, wherein the monitoring packet has a destination MAC address. In the capture of the packet, conventional techniques can be used, for example, comparing the destination MAC address, the source MAC address, the destination IP address, the source IP address, the protocol ID, the TCP/UDP destination, and the TCP/UDP. Sources and other information to filter and extract the monitoring packets to be monitored. The second figure shows the architecture of the captured monitoring packets, and is the information of the traditional Ethernet network road signs (Ethernet V2 and IEEE 802.3), of which Dest. Address is the destination address, and Source Address is the source address.

C) The second layer uplink head adjuster 25 or the second layer downlink head adjuster 15 changes the destination MAC address of the monitoring packet to a specific second layer multicast address.

D) As shown in the third figure, the second layer uplink head adjuster 25 transmits the monitoring packet having the specific second layer multicast address to a central office 27 via a splitter 23 (OLT, Optical Line Terminal). And then transmitted by the central office 27 to the hub 13, and then to the router 11 and a protocol analyzer 29; or, the second layer downstream header adjuster 15 will have a specific second layer multicast address The monitoring packet is transmitted to the hub 13 and then transmitted by the hub 13 to the protocol analyzer 29 and the central office 27, and then transmitted by the central office 27 through the splitter 23 to a corresponding one of the optical network units 21 . It can then be tracked, recorded or analyzed.

The second layer uplink header adjuster 25, the second layer downlink header adjuster 15, the protocol analyzer 29, and the router 11 use the Internet Group Management Protocol (IGMP). And being added to the specific second layer multicast address, thereby receiving the monitoring packet transmitted by the second layer uplink header adjuster 25 or the second layer downlink header adjuster 15.

According to the above steps, the present invention utilizes the second layer uplink head adjuster 25 or the second layer downlink head adjuster 15 to capture the packet and obtain the monitoring packet, and then use the second layer multicast mode. The monitoring packet is wrapped around a particular node (e.g., protocol analyzer 29 or router 11). In this way, you can not make additional bandwidth requirements for Gigabit Passive Optical Network 20 Under the premise of not affecting the normal packet exchange, the protocol analyzer 29 can receive the packet to be monitored, and does not affect the application software or service operation of the monitoring packet, completes the action of transmitting the monitoring packet, and achieves packet monitoring. the goal of.

In addition, since the second layer head end adjuster 15 of the present invention is deployed between the router 11 and the hub 13, and the second layer head end adjuster 25 is deployed on the fiber optic network unit 21, The basic architecture of the Gigabit Passive Optical Network 20 has not changed. By not changing the characteristics of the architecture, the present invention can be embedded in an existing Gigabit passive optical network 20 device or router 11 device, or implemented in a second layer upstream head adjuster 25 and a second layer downstream head adjuster. 15 independent integrated products.

It is worth mentioning that the technology of the present invention is applicable regardless of whether the passive optical network supports the multicast capability. For passive optical networks that support multicast capability, the transmission efficiency of the multicast frame can be increased. For passive optical networks that do not support the multicast capability, the passive optical network will be broadcasted. To transmit the group broadcast frame, but still function properly.

Although the Gigabit passive optical network is taken as an example in the above embodiments, it is merely an example, and the present invention is also applicable to other passive optical networks of non-Gigabit passive optical networks.

As can be seen from the above, the achievable effects of the present invention are:

1. The second layer multicast technology can be used to monitor the routing status of the packet, and the normal packet is sent to the destination node without causing additional bandwidth requirements of the passive optical network.

Second, the second layer multicast technology can be used to send the monitoring packet to the destination Nodes, which in turn monitor packets and are available for tracking and analysis.

11‧‧‧ router

13‧‧‧ hub

15‧‧‧Second level down-end head adjuster

20‧‧‧Gigabit passive optical network

21‧‧‧Fiber network unit

22‧‧‧Upstream entrance

23‧‧‧Splitter

25‧‧‧Second layer upstream head adjuster

27‧‧‧office

29‧‧‧Agreement Analyzer

The first figure is a schematic diagram of the architecture of a preferred embodiment of the present invention.

The second figure is a schematic diagram of the architecture of a preferred embodiment of the present invention, showing the architecture of the captured monitoring packet.

The third figure is a schematic view of the operation of a preferred embodiment of the present invention.

The fourth diagram is a schematic diagram of the architecture of a conventional Gigabit passive optical network.

11‧‧‧ router

13‧‧‧ hub

15‧‧‧Second level down-end head adjuster

20‧‧‧Gigabit passive optical network

21‧‧‧Fiber network unit

22‧‧‧Upstream entrance

23‧‧‧Splitter

25‧‧‧Second layer upstream head adjuster

27‧‧‧office

29‧‧‧Agreement Analyzer

Claims (3)

A method for monitoring packet forwarding using a second layer multicast in a passive optical network includes the following steps: A) deploying a second layer downlink adjuster between a router and a hub, thereby enabling the The second layer downlink head adjuster adjusts the packet between the router and the hub; and each of the fiber optic network units in a passive optical network (PON) deploys a second layer uplink head adjuster. Thereby, each of the second layer uplink head adjusters can adjust the packet of the corresponding fiber network unit; B) when a packet enters or enters by the fiber network unit, that is, the second The layer uplink header adjuster or the second layer downlink header adjuster filters and extracts the packet, and extracts a monitoring packet to be monitored, wherein the monitoring packet has a destination MAC address; C) The second layer uplink head adjuster or the second layer downlink head adjuster changes the destination MAC address of the monitoring packet to a specific second layer multicast address; and D) the second layer uplink head adjuster Will have a specific second layer The monitoring packet of the multicast address is transmitted to an OLT (Optical Line Terminal) through a splitter, and then transmitted to the hub by the central office, and then transmitted to the router and a protocol analyzer; or The Layer 2 downlink headend adjuster transmits the monitoring packet with the specific layer 2 multicast address to the hub, and then the hub transmits the protocol packet to the protocol analyzer and the office end, and then the branch end passes the branch The device transmits to a corresponding one of the fiber optic network units. Passive fiber optic network as described in item 1 of the scope of the patent application A method for monitoring packet forwarding by using a second layer multicast, wherein: the second layer uplink head adjuster, the second layer uplink head adjuster, the protocol analyzer, and the router use internet group management The Internet Group Management Protocol (IGMP) is added to the specific second layer multicast address to receive the monitoring packet transmitted by the second layer uplink header adjuster or the second layer downlink header adjuster. The method for monitoring packet forwarding by using a second layer multicast in a passive optical network according to claim 1 of the scope of the patent application, wherein: the fiber network unit has an uplink portal, and the second layer uplink head adjuster system Configured at the upstream portal.