CN112671647A - Method and equipment for establishing path detection session - Google Patents
Method and equipment for establishing path detection session Download PDFInfo
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- CN112671647A CN112671647A CN202011350328.8A CN202011350328A CN112671647A CN 112671647 A CN112671647 A CN 112671647A CN 202011350328 A CN202011350328 A CN 202011350328A CN 112671647 A CN112671647 A CN 112671647A
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Abstract
The application provides a method and equipment for establishing a path detection session, wherein the method comprises the following steps: searching whether the network address field of the remote identifier has an effective route; if yes, establishing a seamless bidirectional forwarding detection session for the remote identifier and setting the session as an initial state; sending a control message of the seamless bidirectional forwarding detection session according to the effective route; the control message carries a remote identifier so that the response end determines that the remote identifier is a locally configured identifier and sends a response message; receiving a response message with a remote identifier from a response end; and setting the seamless bidirectional forwarding detection session as a working state, and sending a seamless bidirectional forwarding detection message of the seamless bidirectional forwarding detection session according to the effective route.
Description
Technical Field
The present application relates to communications technologies, and in particular, to a method and a device for establishing a path detection session.
Background
The SBFD (Seamless BFD) is a unidirectional fault detection mechanism, simplifies a state machine of the BFD (the SBFD only supports two states of UP and DOWN), shortens session negotiation time, and has a detection speed faster than that of the BFD. SBFD is applicable where only one end needs to perform link state detection.
The roles of the nodes in the SBFD session are divided into an Initiator (Initiator) and a responder (Reflector). The SBFD initiator is responsible for maintaining the state of the SBFD session and periodically sending an SBFD control message. The initiating terminal periodically sends an SBFD control message to a Reflector, and the response terminal checks whether a remote identifier carried by the received SBFD control message is consistent with a locally specified identifier; if the SBFD control messages are consistent, the response end sends an SBFD response message to the initiating end, and if the SBFD response messages are inconsistent, the response end discards the received SBFD control messages.
One node can be used as an Initiator initiating end of different SBFD sessions, so that each remote identifier needs to be set on the initiating end according to the identifier of each responding end, and a network address needs to be statically configured for each remote identifier to establish an SBFD session, which results in a large number of command lines to manually specify the network address corresponding to each remote identifier, and thus the efficiency is low.
Disclosure of Invention
The present application aims to provide a method and a device for establishing a path detection session, which automatically establishes a seamless bidirectional forwarding detection session for a response end
To achieve the above object, the present application provides a method for establishing a path detection session, which includes: searching whether the network address field of the remote identifier has an effective route; if yes, establishing a seamless bidirectional forwarding detection session for the remote identifier and setting the session as an initial state; sending a control message of the seamless bidirectional forwarding detection session according to the effective route; the control message carries a remote identifier so that the response end determines the identifier locally configured by the remote identifier and sends a response message; receiving a response message with a remote identifier from a response end; and setting the seamless bidirectional forwarding detection session as a working state, and sending a seamless bidirectional forwarding detection message of the seamless bidirectional forwarding detection session according to the effective route.
To achieve the above object, the present application further provides an apparatus for establishing a path detection session, including: the session establishing module is used for searching whether the network address field of the remote identifier has an effective route; if yes, establishing a seamless bidirectional forwarding detection session for the remote identifier and setting the session as an initial state; a sending module, configured to send a control packet of the seamless bidirectional forwarding detection session according to the effective route; wherein the control message carries the remote identifier; a receiving module, configured to receive a response packet with the remote identifier; and the session maintenance module is used for setting the seamless bidirectional forwarding detection session to be in a working state and sending a seamless bidirectional forwarding detection message of the seamless bidirectional forwarding detection session according to the effective route.
The method and the device have the advantages that the effective route is searched, the SBFD session is automatically established for the remote identifier, the command line does not need to be manually set one by one for the remote identifier, and the efficiency is improved.
Drawings
Fig. 1 is a flowchart of an embodiment of a method for establishing a path detection session provided in the present application;
fig. 2 is a flowchart of an embodiment of a method for maintaining a path detection session according to the present application;
fig. 3 is a schematic diagram of an embodiment of a device for establishing a path detection session according to the present application.
Detailed Description
A detailed description will be given of a number of examples shown in a number of figures. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the examples.
The term "including" as that term is used is meant to include, but is not limited to; the term "comprising" means including but not limited to; the terms "above," "within," and "below" include the instant numbers; the terms "greater than" and "less than" mean that the number is not included. The term "based on" means based on at least a portion thereof.
Fig. 1 is a flowchart illustrating an embodiment of a method for establishing a path detection session according to the present application, where the method includes:
and the initiating terminal equipment searches a label switching path routing table according to the configured network address prefix or the network address pool of the remote identifier.
And when the initiating terminal does not find the effective route, the seamless bidirectional forwarding detection session is not established for the remote identifier any more.
Step 102, establishing a seamless bidirectional forwarding detection session for the remote identifier and setting the session to an initial state.
And 103, sending the SBFD control message carrying the remote identifier according to the effective route.
The initiating end sends the SBFD control message carrying the remote identifier so that the responding end checks according to the remote identifier carried by the SBFD control message, determines that the remote identifier carried by the received SBFD control message is consistent with the locally configured identifier, and sends the SBFD response message carrying the remote identifier.
And 105, setting the seamless bidirectional forwarding detection session as a working state, and sending a seamless bidirectional forwarding detection message of the seamless bidirectional forwarding detection session according to the effective route.
The method shown in fig. 1 has the beneficial effects that the SBFD session is automatically established for the remote identifier by searching for the valid route, without manually setting command lines one by one for the remote identifier, thereby improving the efficiency.
Fig. 2 is a flowchart illustrating an embodiment of a method for maintaining a path detection session according to the present application; the method comprises the following steps:
Fig. 3 is a schematic diagram illustrating an embodiment of the apparatus for establishing a path detection session according to the present application, where the apparatus 300 includes: a receiving module 301, a sending module 302, a session establishing module 303 and a session maintaining module 304.
A session establishing module 303, configured to find whether a network address segment of the remote identifier has an effective route; if yes, establishing seamless bidirectional forwarding detection session for the remote identifier and setting the session to be in an initial state.
A sending module 302, configured to send a control packet of a seamless bidirectional forwarding detection session according to an effective route; wherein the control message carries a remote identifier.
The receiving module 301 is configured to receive a response packet with a remote identifier.
The session maintenance module 304 is configured to set the seamless bidirectional forwarding detection session to a working state, and send a seamless bidirectional forwarding detection packet of the seamless bidirectional forwarding detection session according to the effective route.
The session establishment module 303 is further configured to not establish a seamless bidirectional forwarding detection session if no valid route for the network address segment of the remote identifier is found.
The session establishing module 303 is further configured to determine that an effective route detection period arrives; detecting whether the effective route is effective; if yes, maintaining a seamless bidirectional forwarding detection session; and if not, deleting the seamless bidirectional forwarding detection session.
The session establishment module 303 is configured to look up a label switched path routing table according to the network address prefix of the remote identifier or the specified network address pool.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (10)
1. A method of establishing a path detection session, the method comprising:
searching whether the network address field of the remote identifier has an effective route;
if yes, establishing a seamless bidirectional forwarding detection session for the remote identifier and setting the session as an initial state;
sending a control message of the seamless bidirectional forwarding detection session according to the effective route; the control message carries the remote identifier so that the response end determines that the remote identifier is a locally configured identifier and sends a response message;
receiving a response message with the remote identifier from the response end;
and setting the seamless bidirectional forwarding detection session to be in a working state, and sending a seamless bidirectional forwarding detection message of the seamless bidirectional forwarding detection session according to the effective route.
2. The method of claim 1, further comprising:
if the valid route of the network address segment of the remote identifier is not found, the seamless bidirectional forwarding detection session is not established.
3. The method of claim 1, further comprising:
determining that an effective route detection period arrives;
detecting whether the valid route is valid;
if yes, maintaining the seamless bidirectional forwarding detection session;
and if not, deleting the seamless bidirectional forwarding detection session.
4. The method of claim 1, wherein finding whether the network address segment of the remote identifier has a valid route comprises: and searching a label switching path routing table according to the network address prefix of the remote identifier.
5. The method of claim 1, wherein finding whether the network address segment of the remote identifier has a valid route comprises: and searching a label switching path routing table according to the designated network address pool of the remote identifier.
6. An apparatus for establishing a path detection session, the apparatus comprising:
the session establishing module is used for searching whether the network address field of the remote identifier has an effective route; if yes, establishing a seamless bidirectional forwarding detection session for the remote identifier and setting the session as an initial state;
a sending module, configured to send a control packet of the seamless bidirectional forwarding detection session according to the effective route; wherein the control message carries the remote identifier;
a receiving module, configured to receive a response packet with the remote identifier;
and the session maintenance module is used for setting the seamless bidirectional forwarding detection session to be in a working state and sending a seamless bidirectional forwarding detection message of the seamless bidirectional forwarding detection session according to the effective route.
7. The device of claim 6, wherein the session establishment module is further configured to not establish a seamless bidirectional forwarding detection session if a valid route for the network address segment of the remote identifier is not found.
8. The apparatus of claim 6, wherein the session establishment module is further configured to determine that an effective route detection period arrives; detecting whether the valid route is valid; if yes, maintaining the seamless bidirectional forwarding detection session; and if not, deleting the seamless bidirectional forwarding detection session.
9. The device of claim 6, wherein the session establishment module is configured to lookup a label switched path routing table according to a network address prefix of the remote identifier.
10. The apparatus of claim 6, wherein the session establishment module is further configured to look up a label switched path routing table based on a specified network address pool of the remote identifier.
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| WO2022143874A1 (en) * | 2020-12-31 | 2022-07-07 | 华为技术有限公司 | Method for detecting state of bgp session, apparatus and network devices |
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