CN107911262A - A kind of cross-domain method that detection of connectivity is carried out using LSP Ping/Traceroute - Google Patents
A kind of cross-domain method that detection of connectivity is carried out using LSP Ping/Traceroute Download PDFInfo
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- CN107911262A CN107911262A CN201711145698.6A CN201711145698A CN107911262A CN 107911262 A CN107911262 A CN 107911262A CN 201711145698 A CN201711145698 A CN 201711145698A CN 107911262 A CN107911262 A CN 107911262A
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- lsp
- relay node
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- traceroute
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Cardiology (AREA)
- General Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention discloses a kind of cross-domain method that detection of connectivity is carried out using LSP Ping/Traceroute, comprise the following steps：Establish MPLS LSP end to end between two cross-domain PE equipment, and on the boundary node of AS or AREA configuration identifier as relay node；The PE equipment of the start site of LSP Ping/Traceroute, the MPLS ECHO REQUEST detection messages sent, carries the IP address of corresponding relay node as relay node information；The PE equipment of the termination website of LSP Ping/Traceroute, when replying MPLS ECHO REPLY messages, is replied according to relay node information.The present invention, by on AS or AREA boundary nodes, relay the MPLS ECHO REPLY of LSP Ping/Traceroute, realize across AS or reply message reliable and stable ground routing forwarding time PE1 websites across LSR in area, ensure that LSP Ping/Traceroute are normal effective in Inter AS and Inter area scenes.
Description
Technical field
The present invention relates to network communication technology field, and in particular to one kind is cross-domain to be carried out using LSPPing/Traceroute
The method of detection of connectivity, for the MPLS LSP in Inter-AS or Inter-Area deployment, uses LSP Ping/
Traceroute carries out detection of connectivity.
Background technology
Main explanation of technical terms used in the present invention is as follows：
PE equipment, Provider Edge, network side edge device；
P equipment, Provider, core equipment；
ASBR, Autonomous System Boundary Router, Autonomous System Boundary Router, AS Boundary Router；
CSG, Cell Site Gateway, base-station gateway；
ASG, Aggregate Service Gateway, assemble Service Gateway；
MASG, Mobile Aggregate Service Gateway, mobile convergence Service Gateway；
LSR, Label Switching Router, Label Switch Router；
Inter-AS, between the advanced field；
Inter-area, it is interregional；
AS, route Autonomous Domain；
AREA, Routing Area.
MPLS as a kind of it is known that mature technology, be widely deployed in service provider network core layer and
Convergence-level.
At present, access layer MPLS technology (MPLS in the access) is also increasingly ripe perfect, is seamless MPLS skills
The realization of art (seamless MPLS) provides good basic condition.By in the access layer of network, convergence-level and core layer
One complete MPLS LSP of middle deployment, a kind of transmission service end to end is provided for client.
The cross-domain technological break-throughs of the MPLS VPN limitation of single service provider administrator, has expanded MPLSVPN frameworks
Flexibility so that deployment way meets the network deployment request constantly expanded, and becomes a kind of very ripe vpn service deployment
Framework.
A kind of important fault detects and positioning instrument of the LSP Ping/Traceroute as MPLS LSP, it is wide
It is general to be applied in network deployment and regular maintenance.But in some Inter-AS and Inter-area deployment scenarios, LSP
Ping/Traceroute can not be applied effectively.
In the Inter-AS application scenarios shown in Fig. 1, deploy MPLS LSP between PE1 and PE2, and positioned at two every
From AS on.If the IP address of PE1 is not published to AS2, the LSR in AS2 can not be reported with the IP of routing forwarding to PE1
Text.For example, the P2 websites in AS2 just E-Packet without normal direction PE1 because the IP address of PE1 route in AS1 it is reachable, still
It is that route is inaccessible in AS2.So LSP Ping/ initiated in PE1 (detection initiation source LSR) equipment
Traceroute, can not receive the MPLS ECHO REPLY message packets of the LSR in AS2, causes LSPPing/Traceroute
Failure.
Inter-area application scenarios as shown in Figure 2 again, the LSR in core layer, due to any access layer section
The IP routes of point (Access Node, AN) are unreachable.In LSP one end, access node layer carries out LSP Ping/Traceroute
When, core net interior joint, opposite end convergence-level node, opposite end access node layer can not all send MPLS ECHO REPLY.Detection hair
PE1 in originating node LSR can not receive MPLS ECHO REPLY message packets, cause LSP Ping/Traceroute to fail.
It can be seen from the above that in some Inter-AS and Inter-area deployment scenarios, due to replying Label Switch Router
The route of (Label Switching Router, LSR) to detection promoter are unreachable, and LSR can not rely on IP routing forwardings, will
MPLS ECHO REPLY message packets are recycled to source node LSR, reply message message and are dropped, so as to cause detection to be failed, make
Can not effectively it be applied into LSP Ping/Traceroute.
The content of the invention
The technical problems to be solved by the invention are that some Inter-AS and Inter-area deployment scenarios LSR can not be relied on
IP routing forwardings, are recycled to source node LSR by MPLS ECHO REPLY message packets, ultimately result in LSP Ping/
The problem of Traceroute can not be applied effectively.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention, which is to provide, a kind of cross-domain uses LSP
The method that Ping/Traceroute carries out detection of connectivity, comprises the following steps：
MPLS LSP end to end are established between two cross-domain PE equipment, and on the boundary node of AS or AREA
Configuration identifier is as relay node；
The PE equipment of the start site of LSP Ping/Traceroute, the MPLS ECHO REQUEST detection reports sent
Text, carries relay node information of the IP address of corresponding relay node as the boundary node of AS or AREA；
The PE equipment of the termination website of LSP Ping/Traceroute, is replying MPLS ECHO REPLY messages
When, replied according to the relay node information in MPLS ECHO REQUEST detection messages.
In the above method, the acquisition modes of relay node information include：
The active probe relay node after MPLS LSP are successfully established, collects relaying stack address information；
After LSP Traceroute operations were performed in last time, relay node information is preserved；
For the manual static configuration relay node information of LSP.
In the above method, when performing LSP Ping operations, the label TTL of the PE equipment default setting messages of start site
More than LSP TTL, MPLS ECHO REQUEST detection messages are forwarded by the Tag switching of datum plane, finally in opposite end PE
It is received in equipment；Opposite end PE equipment is when replying MPLSECHO REPLY messages, according to MPLS ECHO REQUEST inspections
The relay node information in text is observed and predicted, is replied according to RFC7743.
In the above method, perform LSP Traceroute operate and preserve relay node information method it is as follows：
When performing LSP Traceroute operations, the PE equipment of start site sends TTL=1,2,3 ... ..., N successively
MPLS ECHO REQUEST detection messages, detection messages are transmitted on MPLS LSP with Tag switching successively, often by one
Node TTL subtracts 1, corresponds at it when ttl value is reduced to 1 and is received on website, if current device is AS borders or area sides
Boundary, then replied in replying message according to the Relay Node Address Stack TLV structures in RFC7743, and with our station
Point is used as relay node, wherein, the outgoing interface address of MPLS LSP next-hops on this site is as relay node information, finally
Relay node information is collected by the PE equipment of start site；N between two cross-domain PE equipment P equipment and ASBR equipment it is total
With.
In the above method, by the mark set in corresponding communication link interface, determine whether AS borders or
Area borders.
The present invention, by AS or AREA boundary nodes, relaying the MPLS ECHO of LSP Ping/Traceroute
REPLY, realizes across AS or replies message reliable and stable ground routing forwarding time PE1 websites across LSR in area, ensure that LSP
Ping/Traceroute is normal effective in Inter-AS and Inter-area scenes, and implementation is simple and reliable.
Brief description of the drawings
Fig. 1 is existing Inter-AS application scenarios schematic diagrams；
Fig. 2 is existing Inter-area application scenarios schematic diagrams；
Fig. 3 is application scenarios principle schematic of the present invention；
Fig. 4 is MPLS ECHO message structure figures of the present invention；
Fig. 5 is Relay Node Address Stack TLV structure charts of the present invention.
Embodiment
, can the present invention provides a kind of cross-domain method that detection of connectivity is carried out using LSP Ping/Traceroute
Ensure that LSP Ping/Traceroute are normal effective in Inter-AS and Inter-area scenes.It is attached with reference to specification
Figure and embodiment are described in detail the present invention.
Being established in application scenarios as shown in Figure 3, between cross-domain two PE equipment PE1 and PE2 has MPLS end to end
LSP, and end-to-end MPLS LSP cross over two AS, wherein PE1, P1, ASBR1 is in AS1, and ASBR2, P2, PE2 are in AS2.PE
Equipment is the start site of LSP Ping/Traceroute detections and terminates website, and P equipment is the bone in service provider network
Dry router, main MPLS label of completing exchange forwarding, the lsp failure constrained according to RFC4379 and RFC7743 standard criterions
Detection and positioning.
The cross-domain method that detection of connectivity is carried out using LSP Ping/Traceroute provided by the invention, including it is following
Step：
MPLS LSP end to end are established between two cross-domain PE equipment, and on the boundary node of AS or AREA
Configuration identifier is as relay node；
The PE equipment of the start site of LSP Ping/Traceroute, the MPLS ECHO REQUEST detection reports sent
Text, carries relay node information of the IP address of corresponding relay node as the boundary node of AS or AREA；
The PE equipment of the termination website of LSP Ping/Traceroute, is replying MPLS ECHO REPLY messages
When, replied according to the relay node information in MPLS ECHO REQUEST detection messages.
MPLS ECHO message structures are as shown in Figure 4.
The above method, when performing LSP Ping operations, the label TTL of the PE equipment default setting messages of start site is big
In LSP TTL (whole MPLS LSP transmission paths maximum hop count), MPLS ECHOREQUEST detection messages pass through datum plane
Tag switching forwarding, be finally received in the PE equipment of opposite end.Opposite end PE equipment disappears in reply MPLS ECHO REPLY messages
During breath, according to the content of the relay node information in MPLS ECHOREQUEST detection messages, the IP address of relay node is obtained,
In this, as route, replied according to RFC7743, so as to ensure that MPLS ECHO REPLY messages have correctly been forwarded to
The PE equipment of initial station point.
Relay node information acquiring pattern can be divided into following three kinds：
(1) the active probe relay node after LSP is successfully established, collects relaying stack address information；
(2) after LSP Traceroute operations are performed, relay node information is preserved, i.e., last time or performs LSP each time
After Traceroute operations, relay node information is preserved, is used when performing LSPPing/Traceroute for next time；Can also
A LSP Traceroute operation is first carried out, to obtain relay node information；
(3) it is the manual static configuration relay node information of LSP.
It is as follows by the method for performing LSP Traceroute operation preservation relay node information：
When performing LSP Traceroute operations, the PE equipment of start site sends TTL=1,2,3 ... ..., N successively
MPLS ECHO REQUEST detection messages, N summations of P equipment and ASBR equipment between two cross-domain PE equipment.Detection
Message is transmitted on MPLS LSP with Tag switching successively, often subtracts 1 by a node TTL, right at its when ttl value is reduced to 1
Answer and be received on website.If current device is AS borders or area borders, then according in RFC7743 in replying message
" Relay Node Address Stack TLV " structures are (as shown in Figure 5) to reply, using this website as relay node, i.e. MPLS
The outgoing interface address of LSP next-hops on this site is as relay node information.
AS borders or area borders are determined whether, by setting mark to be in corresponding communication link interface.
If flag bit is arranged to TRUE, it is that AS borders or area borders are saved, it is necessary to be used as to relay using the node to represent the node
Point.If flag bit is arranged to FALSE, it is not AS borders or area borders to represent the node, it is not necessary to the node conduct
Relay node.
Embodiment 1.
The present embodiment is the application that MPLS LSP Traceroute detections are used in Inter-AS scenes.
Application scenarios as shown in Figure 3, the PE equipment PE1 of start site send the MPLSECHO REQUEST that ttl value is 1
Detection messages, are received after being transmitted on LSP by P1 equipment；Because P1 is not AS borders, boundary marker is not provided with, so in replying
After nodal information be next-hop outgoing interface IP：10.23.0.2, K-bit is arranged to 0；
PE1 sends the detection messages that ttl value is 2, is received after being transmitted on LSP by ASBR1 equipment；Because ASBR1 is AS1
Border, there is provided boundary marker, so it is next-hop outgoing interface IP to reply relay node information：10.34.0.3 K-bit is set
It is set to 1；
PE1 sends the detection messages that ttl value is 3, is received after being transmitted on LSP by ASBR2 equipment；Because ASBR2 is AS2
Border, there is provided boundary marker, so it is next-hop outgoing interface IP to reply relay node information：10.45.0.4 K-bit is set
It is set to 1；
PE1 sends the detection messages that ttl value is 4, is received after being transmitted on LSP by P2 equipment；Because P2 is not AS borders,
Boundary marker is not provided with, so it is next-hop outgoing interface IP to reply relay node information：10.56.0.5, K-bit is arranged to 0；
PE1 sends the detection messages that ttl value is 5, is received after being transmitted on LSP by PE2 equipment；Because PE2 is LSP
Egress (outlet LER), so not replying relay node information.
Accordingly, PE1 collects out LSP：(PE1)1.1.1.1/32……>(PE2) the relay node information of 6.6.6.6/32
For：1.1.1.1…>10.34.0.3…>10.45.0.4…>6.6.6.6.
Terminate the PE equipment PE2 of website, when replying MPLS ECHO REPLY messages, for AS borders or
Area borders, it is true according to relay node the information 10.45.0.4 and 10.34.0.3 in MPLS ECHO REQUEST detection messages
Fixed route, is replied, so that ensure that the IP address of PE1 is correctly published to AS2, and the LSR in AS2 can pass through route
Forward MPLS ECHO REPLY to PE1.
Embodiment 2.
The present embodiment is the application that MPLS LSP Ping detections are used in Inter-AS scenes.
The relay node information checked on the PE equipment PE1 of start site, it is assumed that relay node information is by embodiment 1
Perform LSP Traceroute operations and preserve acquisition；
PE1 sends the MPLS ECHO REQUEST detection messages that ttl value is more than LSP TTL, by LSP after being transmitted on LSP
Egress websites PE2 is received, and the IP address of relay node is carried in MPLS ECHO REQUEST detection messages as boundary node
Relay node information；
The PE equipment PE2 of website is terminated according to the content of relay node information, first send message to nearest relay node
ASBR2, and it is 10.45.0.4 to set destination IP；
After ASBR2 receives relaying reply message, the relay node information of message is traveled through, then message is sent to next relaying and is saved
Point ASBR1：Destination IP is 10.34.0.3；
After ASBR1 receives relaying reply message, the relay node information of message is traveled through, directly by message with MPLS ECHO
REPLY forms send to source and detect LSR：PE1.
After the PE equipment PE1 of start site receives reply, LSP statistical informations are gathered, so as to solve common LSP Ping
The problem of can not being applied under this kind of scene.
In both examples above, the relay node information of boundary node is operated using LSP Traceroute are performed
Afterwards, the mode of preservation relay node information obtains.
For active probe relay node after being successfully established in MPLS LSP, and collect relaying stack address information and be
The mode of the manual static configuration relay node information of LSP, is the common mode of the prior art, details are not described herein.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn that the knot made under the enlightenment of the present invention
Structure changes, and the technical schemes that are same or similar to the present invention, each fall within protection scope of the present invention.
Claims (5)
- A kind of 1. cross-domain method that detection of connectivity is carried out using LSP Ping/Traceroute, it is characterised in that including following Step：MPLS LSP end to end are established between two cross-domain PE equipment, and are configured on the boundary node of AS or AREA Mark is used as relay node；The PE equipment of the start site of LSP Ping/Traceroute, the MPLS ECHO REQUEST detection messages sent, takes Relay node information of the IP address with corresponding relay node as the boundary node of AS or AREA；The PE equipment of the termination website of LSP Ping/Traceroute, when replying MPLS ECHO REPLY messages, according to Replied according to the relay node information in MPLS ECHO REQUEST detection messages.
- 2. the method as described in claim 1, it is characterised in that the acquisition modes of relay node information include：The active probe relay node after MPLS LSP are successfully established, collects relaying stack address information；After LSP Traceroute operations were performed in last time, relay node information is preserved；For the manual static configuration relay node information of LSP.
- 3. the method as described in claim 1, it is characterised in that when performing LSP Ping operations, the PE equipment of start site The label TTL of default setting message is more than the label that LSP TTL, MPLS ECHO REQUEST detection messages pass through datum plane Forwarding is exchanged, is finally received in the PE equipment of opposite end；Opposite end PE equipment when replying MPLS ECHO REPLY messages, According to the relay node information in MPLS ECHOREQUEST detection messages, replied according to RFC7743.
- 4. the method as described in claim 1, it is characterised in that perform LSP Traceroute and operate and preserve relay node letter The method of breath is as follows：When performing LSP Traceroute operations, the PE equipment of start site sends TTL=1 successively, 2,3 ... ..., N's MPLS ECHO REQUEST detection messages, detection messages are transmitted on MPLS LSP with Tag switching successively, often by a section Point TTL subtracts 1, corresponds at it when ttl value is reduced to 1 and is received on website, if current device is AS borders or area borders, Replied in so replying message according to the Relay Node Address Stack TLV structures in RFC7743, and with this website As relay node, wherein, the outgoing interface address of MPLS LSP next-hops on this site as relay node information, finally by The PE equipment of start site collects relay node information；N between two cross-domain PE equipment P equipment and ASBR equipment it is total With.
- 5. method as claimed in claim 4, it is characterised in that by the mark set in corresponding communication link interface, sentence Whether disconnected is AS borders or area borders.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112491646A (en) * | 2020-11-13 | 2021-03-12 | 中盈优创资讯科技有限公司 | VPN end-to-end performance monitoring method and device |
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