Method for Diagnosing the Router Which Supports Policy-Based Routing

• US 20070248019A1
• Filed: 12/28/2004
• Published: 10/25/2007
• Est. Priority Date: 12/28/2004
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Du, Ke, Feng, Jian, He, Hui
• Granted Patent: US 8,223,761 B2
• Time in Patent Office: Days
• US Class Current: 370/241
• CPC Class Codes: H04L 41/14 Network analysis or design
• CPC Class Codes: H04L 43/0817 by checking functioning
• CPC Class Codes: H04L 43/0829 Packet loss
• CPC Class Codes: H04L 43/10 Active monitoring, e.g. heartbeat, ping or trace-route
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/302 Route determination based on requested QoS
• CPC Class Codes: H04L 45/306 Route determination based on the nature of the carried application

Abstract

A route diagnosis method which supports policy-based routing is applied in the network which includes a router supporting policy-based routing, which comprises: adding stream description information of service stream in diagnosis-protocol-message, and containing a router warning option in IP head of the said diagnosis-protocol-message; based on the router supporting policy-based routing receiving said diagnosis-protocol-message, routing according to said stream description information in the said diagnosis-protocol-message; said diagnosis-protocol-message is processed as standard diagnosis-protocol-message by the router which is independent of policy-based routing. Employing the method of the present invention, the middle router which supports policy-based routing is able to transfer the message independent of IP head of the said diagnosis-protocol-message, but select routing according to said stream description information included in the message, thereby being capable of keeping the consistency between the diagnosis-protocol-message and routing of the service stream. The purpose that is actually diagnosing routing or correctly diagnosing route is achieved.

Claims

1. A method for diagnosing a router which supports policy-based routing, which is applied in a network including a router supporting policy-based routing, characterized in that the method comprises:

adding stream description information of a service stream in a diagnosis-protocol-message, and containing a router warning option in the IP head of said diagnosis-protocol-message;

a router supporting policy-based routing receiving said diagnosis-protocol-message, routing according to said stream description information in said diagnosis-protocol-message; and

said diagnosis-protocol-message being processed as standard diagnosis-protocol-message by a router which is independent of the policy-based routing.

2. The method for diagnosing a router which supports policy-based routing according to claim 1, characterized in:

the step of routing according to stream description information further comprising;

analyzing the contents of the stream description information;

matching the local routing policy according to said contents, and routing according to the policy matched.

3. The method for diagnosing a router which supports policy-based routing according to claim 2, characterized in:

said diagnosis-protocol-message is the echo message of the Internet control message protocol;

wherein the step of routing according to the stream description information further comprises the processing of the time to live value when it is timeout, that is, if the time to live value being timeout, returning an internet control message protocol timeout message.

4. The method for diagnosing a router which supports policy-based routing according to claim 2, characterized in:

the step of adding the stream description information of service stream in the diagnosis-protocol-message comprises;

adding said stream description information in the protocol data unit of said diagnosis-protocol-message.

5. The method for diagnosing a router which supports policy-based routing according to claim 1, characterized in:

said stream description information employing the coding format of “

type-length-parameter value”

.

6. The method for diagnosing a router which supports policy-based routing according to claim 5, characterized in:

said stream description information comprises one of or the combination of protocol type, type of service request, source address, source port, target address, target port, identification information, and extensible sign of the service stream.

7. The method for diagnosing a router which supports policy-based routing according to claim 6, characterized in:

if said network comprises a network address transformation apparatus, said network address transformation apparatus analyzes the received stream description information of said diagnosis-protocol-message, and then it further comprises;

modifying the source address or source port of the stream description information to the source address and source port of said service stream after address transformation.

8. The method for diagnosing a router which supports policy-based routing according to claim 6, characterized in:

if said network comprises a service classification apparatus, said service classification apparatus analyzes the stream description information of said diagnosis-protocol-message received, and then it further comprises;

judging whether said stream description information comprises the request of service type;

if yes, amending said request of service type to the request of service type carried by the service stream after it passes through said service classification apparatus;

if not, adding directly the request of service type carried by the service stream after it passes through said service classification apparatus.

9. The method for diagnosing a router which supports policy-based routing according to claim 1, characterized in:

said method further comprises;

limiting the amount of the message of the Internet control message protocol which enters a control layer.

10. The method for diagnosing a router which supports policy-based routing according to claim 6, characterized in:

if a network edge router is configured with the passwords of ping/trace route of the Internet control message protocol, said network edge router, after it receives said diagnosis-protocol-message, further comprises;

checking the protocol data unit of said diagnosis-protocol-message, if said protocol data unit not carrying said authentication information, or if said identification information not matching said password of ping/trace, then abandoning said diagnosis-protocol-message.