Method, equipment and system for withdrawing from elegant restart

An elegant restart and restart technology, applied in the field of network communication, can solve problems such as out-of-synchronization of timer timeout, inability to control Restarter and Helper, and forwarding failure.

CN101505277BInactive Publication Date: 2011-04-20GLOBAL INNOVATION AGGREGATORS LLC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2011-04-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method, equipment and a system for exiting graceful restart. When a first timer of a restart end is overtime, the restart end exits the graceful restart and sends a first notification message for notifying helpers of exiting the graceful restart to all the neighbor helpers respectively; the neighbor helpers exit the graceful restart after receiving the first notification message; when a second timer of the helpers is overtime, the helpers exit the graceful restart and send a second notification message that the helpers exit the graceful restart to the neighbor restartend; and the restart end exits the graceful restart after receiving the second notification message that all the neighbor helpers exit the graceful restart. Thus the method, the equipment and the system ensure that the restart end and the helpers can promptly exit the graceful restart, thereby preventing forwarding table entries of the restart end and the helpers from not being deleted in time further to cause the blocked forwarding.
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Description

technical field

[0001] The invention relates to the technical field of network communication, in particular to a method, device and system for exiting graceful restart. Background technique

[0002] Multi-Protocol Label Switching (MPLS, Multi-Protocol Label Switching) can support multi-layer labels and connection-oriented, and has good scalability, making it possible to provide customers with various services on a unified MPLS / IP basic network architecture. Label Distribution Protocol (LDP, Label Distribution Protocol) is a control protocol of MPLS, which is responsible for the classification of forwarding equivalence class (FEC, Forwarding Equivalence Class), the distribution of labels, and the establishment and maintenance of Label Switched Path (LSP, Label Switched Path). operate.

[0003] Through LDP or Constrained Route-Label Distribution Protocol (CR-LDP, Constrained Route-Label Distribution Protocol), Label Switched Router (LSR, Label Switched Router) can directly ma...

Examples

Embodiment 1

[0037] see image 3 , which is a flowchart of the first embodiment of the method based on the present invention.

[0038] In this embodiment, the restart terminal is taken as an example to illustrate the method for exiting graceful restart in the present invention.

[0039] S301: When the control plane is restarted, the Restarter starts a first timer.

[0040] In the embodiment of the present invention, the first timer started by the Restarter is an MPLS timer. Before the first timer expires, the forwarding plane will retain the label forwarding information before the restart of the control plane, and the control plane will recover the label information. After the first timer expires, if there is label information that has not been recovered, the forwarding plane will delete the label information that has not been recovered.

[0041] S302a: If the first timer expires, the Restarter exits the GR, and sends a first notification message to all neighbor Helpers, where the first n...

Embodiment 2

[0051] see Figure 4 , which is a flowchart of the second embodiment of the method based on the present invention.