JP2001333140A - Method for monitoring inside of ip router - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for monitoring the inside of an IP router without deteriorating a band of an IP packet. SOLUTION: By inserting a packet for in-router monitoring to an overhead of the SONET/SDH having an idle band in the router, the presence of missing of a packet in the router and the normality of routing are always monitored. Then a position instruction signal of an in-router monitor packet is used to delete the in-router monitor packet and to add the SONET/SDH overhead to the packet and the result is outputted as output POS data to a channel. Since the overhead of the SONET/SDH is used for an inserted band of the in-router monitor packet, deterioration in the bad of an IP packet can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a SONET / SD
The present invention relates to an in-device monitoring method of an IP router device having a so-called POS interface for mapping and transmitting an IP packet to a payload portion of an H interface.

[0002]

2. Description of the Related Art As an in-device monitoring method for an IP router device, an in-device monitoring packet is conventionally generated and passed through the device, thereby detecting device errors such as the presence / absence of packet loss and routing errors. There is a method.

[0003]

However, in the above-described method for monitoring the inside of the device of the IP router, since the generated inside-device monitoring packet flows in the inside of the device, the method is adopted for the reason that the bandwidth of the packet is deteriorated accordingly. It was difficult.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an IP router device monitoring method capable of monitoring the inside of the device without deteriorating the bandwidth of the IP packet. That is.

[0005]

Means for Solving the Problems To achieve the above object, the features of the first aspect of the present invention are SONET / SDH (Sy
nchronous Optical Network / Synchronous Digital Hier
archy) The IP (Internet
Protocol) POS for mapping and transmitting packets
IP with (Packet Over SONET / SDH) interface
A step of generating an in-device monitoring packet for monitoring the presence / absence of a packet loss and the normality of routing in an IP router device monitoring method of a router device; and a SONET / SDH overhead portion which becomes a free band in the device. Inserting the intra-device monitoring packet into the device.

A feature of the invention of claim 2 is that the amount of accumulated data in a memory for writing packet data to be input to the device is monitored, and when the amount becomes smaller than a certain value, reading of packet data from the memory is stopped. The generated in-device monitoring packet is converted to an SONE which is a free band in the device.
It is to insert it into the overhead part of T / SDH.

According to a third aspect of the present invention, the in-apparatus monitoring packet has a packet length in which a memory for writing packet data input to the apparatus does not overflow, and can be recognized as an in-apparatus monitoring packet by a circuit in the apparatus. It has a unique identification value that makes the packet version area etc. unique to the line, and has a header and payload value devised so that packet loss and routing operation can be monitored in the packet processing unit. I do.

A fourth feature of the present invention is that, by using the position indication signal of the in-device monitoring packet, the in-device monitoring packet is deleted, and a SONET / SOH overhead is added to output POS data. Output to the line.

The monitoring method in the IP router device of the present invention
IP in payload part of ONET / SDH interface
In an IP router device having a so-called POS interface for mapping and transmitting a packet, by inserting the monitoring packet in the device into an overhead portion of SONET / SDH which becomes a free band in the device, the bandwidth of the packet deteriorates. Have been around.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an IP router device according to an embodiment of the monitoring method in the IP router device of the present invention. The IP router device 1 uses the memory 8 to store the SONET / SDH overhead drop circuit 2 that terminates the SONET / SDH overhead part of the input POS data 10 from the line and the memory 8 in which the SONET / SDH overhead is deleted and becomes free. 1
In-device monitoring packet 1 collected in a section and generated in the device
3 for inserting a packet into the band, and a device for generating a device monitoring packet 13 in which the version of the packet is set to a unique value in order to distinguish the packet from the packet input from the line side. A monitoring packet generation circuit 7, a packet processing unit 4 that performs packet processing such as routing as an IP router, and an in-device monitoring packet drop circuit 5 that terminates in-device monitoring packets
And a SONET / SDH overhead insert circuit 6 for adding a SONET / SDH overhead for outputting to a line.

Next, the operation of this embodiment will be described.
Input POS data 10 input to the IP router device 1 from the line is subjected to SONET / SDH overhead termination processing by a SONET / SDH overhead drop circuit 2, and is input into the next-stage monitoring packet insert circuit 3 as input-side packet data 11. Is input to For the input side packet data 11, the data format input from the line remains unchanged, and the SONET / SD
SON input from H overhead drop circuit 2
The SONET / SDH overhead is inserted at the position indicated by the ET / SDH overhead position indicating signal 12.

The in-device monitoring packet insert circuit 3 has a memory 8 and uses the SONET / SDH overhead position indication signal 12 to store only the packet data obtained by removing the SONET / SDH overhead from the input side packet data 11 into the memory 8. Write. Further, reading from the memory 8 is performed in packet units at the same speed as writing.

The relationship between the data amount on the write side of the memory 8 and the read amount is such that (SONET / SDH overhead) is not written in the memory 8, so that (write amount) <(read amount). In-device monitoring packet insert circuit 3
Monitors the amount of accumulated data in the memory 8, stops reading the data when it becomes a certain value or less, inserts the in-device monitoring packet 13 generated by the in-device monitoring packet generation circuit 7, and outputs the data as the packet processing unit input data 14. Input to the packet processing unit 4.

The in-device monitoring packet generator 7 includes (1)
The packet length is such that the memory 8 does not overflow,
(2) The packet processing unit 4 and the in-device monitoring packet drop circuit 5 have, for example, an identification value in which a packet version area or the like is a unique value that does not exist on a line so that the packet can be recognized as an in-device monitoring packet. (3) Generate an in-device monitoring packet 13 that satisfies three conditions: a packet having a header and a payload value that is devised so that packet loss and routing operation can be monitored in the packet processing unit 4. This is output to the in-device monitoring packet insert circuit 3. The packet insert circuit 3 for monitoring inside the device is SONET / SD
H, the band which has become free due to the removal of the overhead is collected into one section using the memory 8, and this band, ie, SONET
The generated intra-device monitoring packet 13 is inserted into the overhead portion of / SDH.

Since the routing operation monitored here is closed in the device, the in-device monitoring packet 13 is generated so that the routing destination is not the address on the network but the output port in the device. . At this time, the number of monitoring packets generated for each output port is embedded in the in-device monitoring packet 13 so that a packet loss can be detected. The packet processing unit 4 performs only a routing process different from a process for a normal packet when the in-device monitoring packet 13 is received.

The in-device monitoring packet drop circuit 5 identifies the in-device monitoring packet 13 from the packet processing unit output data 15 output from the packet processing unit 4 based on the identification value given by the in-device monitoring packet generation unit 7. Then, the presence / absence of packet loss and the normality of the routing are checked, and if an abnormality is found, a notification is sent as an alarm 16.

From the in-device monitoring packet drop circuit 5, the in-device monitoring packet 13 and the packet to be output to the line are mixed. Then, an in-device monitoring packet position indicating signal 19 indicating the insertion position of the output side packet data 17 and the in-device monitoring packet 13 is output from the in-device monitoring packet drop circuit 5 to the SONET / SOH overhead insert circuit 6. The SONET / SOH overhead insert circuit 6 deletes the in-apparatus monitoring packet 13 using the in-apparatus monitoring packet position indication signal 19, adds a SONET / SOH overhead, and outputs it as output POS data 18 to the line.

According to the present embodiment, since the monitoring packet in the device is inserted into the overhead portion of the SONET / SDH which becomes a free band in the device, the monitoring in the device can be performed without deteriorating the bandwidth of the IP packet. . Also, S
Since the overhead part of the ONET / SDH is used, periodic in-device monitoring is possible.

[0019]

As described in detail above, the I of the present invention
According to the monitoring method in the P router device, the monitoring in the device can be performed without deteriorating the bandwidth of the IP packet.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an IP router device according to an embodiment of an IP router internal monitoring method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 IP router apparatus 2 SONET / SDH overhead drop circuit 3 In-device monitoring packet insert circuit 4 Packet processing unit 5 In-device monitoring packet drop circuit 6 SONET / SDH overhead insert circuit 7 In-device monitoring packet generation circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) H04L 29/06 F term (reference) 5K028 AA14 CC05 EE07 KK03 KK32 MM14 QQ02 TT01 5K030 GA14 HA08 HB11 HC01 HD03 JA05 JA10 JL07 JL10 KA13 KX30 MB04 MC03 5K034 AA05 FF02 GG03 HH04 HH10 HH14 MM31 MM39 RR01 TT02 5K035 AA03 BB04 CC09 DD01 GG02 GG05 JJ04 KK01 MM03

Claims (4)

[Claims] 1. SONET / SDH (Synchronous Opti
cal POS (Packet Over SO) that maps and transmits IP (Internet Protocol) packets to the payload of the Network / Synchronous Digital Hierarchy (Interface) interface.
NET / SDH) IP of IP router with interface
In the monitoring method in the router device, a step of generating an in-device monitoring packet for monitoring the presence / absence of a packet loss and the normality of routing, and an overhead portion of SONET / SDH which becomes a free band in the device. Inserting a monitoring packet into the IP router device. 2. The apparatus according to claim 1, wherein the amount of accumulated data in a memory for writing packet data input to the device is monitored, and when the amount of data becomes smaller than a certain value, reading of the packet data from the memory is stopped. 2. The method according to claim 1, wherein the packet is inserted into an overhead portion of SONET / SDH which becomes a free band in the device.
Monitoring method in P router device. 3. The in-apparatus monitoring packet has a packet length that does not overflow a memory in which packet data to be input to the apparatus is written, and has a packet version that can be recognized as an in-apparatus monitoring packet by a circuit in the apparatus. 2. The packet processing unit according to claim 1, further comprising a header and a payload value which have an identification value in which an area or the like is set to a unique value which is not present in the line, and which is devised so as to monitor packet loss and routing operation in a packet processing unit. Or the monitoring method in the IP router device according to 2. 4. An output PO by adding a SONET / SOH overhead after deleting the intra-device monitoring packet using a position indication signal of the intra-device monitoring packet.
4. The monitoring method according to claim 1, wherein the data is output to a line as S data.