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A technology of label switching path and recovery method, applied in the field of graceful restart GR recovery, can solve the problem of not knowing the existence of LSP, and achieve the effect of saving network bandwidth, reducing traffic, and saving network overhead
Active Publication Date: 2016-06-01
NANJING ZHONGXING SOFTWARE
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However, for the LSP actively created by the PCE, RSVP does not know the existence of the LSP before the LSPGR succeeds.
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Embodiment 1
[0025] Such as figure 1 As shown, the embodiment of the present invention provides a method for recovering the graceful restart GR of the label switched path LSP, including:
[0026] Step 101, pre-record and save the information of the PCELSP created by the path computation unit PCE.
[0027] Wherein, the information of the PCELSP (representing the LSP created by the PCE, and the following PCELSPs all represent this meaning) is stored in a storage location not affected by the GR, for example, the GR of the mainboard can be stored in a storage unit of the standby board.
[0028] Specifically, the LSP data corresponding to the LSP created by the PCE is stored, and a field for indicating that the LSP data is created by the PCE is added to the LSP data segment.
[0029] Step 102, when the node GR is completed, judge whether there is a PCELSP that has not been successfully restored according to the recorded information of the PCELSP.
[0030] Step 103 , if there is a PCELSP that ...
Embodiment 2
[0042] like image 3 As shown, corresponding to the recovery method of the graceful restart GR of the label switched path LSP in the first embodiment, the embodiment of the present invention also provides a recovery device of the graceful restart GR of the label switched path LSP, and the device 30 includes :
[0043] A recording module 31, configured to pre-record and save the information of the PCELSP created by the path computation unit PCE;
[0044] Wherein, the information of the PCELSP (representing the LSP created by the PCE, and the following PCELSPs all represent this meaning) is stored in a storage location not affected by the GR, for example, the GR of the mainboard can be stored in a storage unit of the standby board.
[0045] Specifically, the LSP data corresponding to the LSP created by the PCE is stored, and a field for indicating that the LSP data is created by the PCE is added to the LSP data segment.
[0046] The first judging module 32 is used to judge whe...
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Abstract
The invention provides a label switched path (LSP) graceful restart (GR) recovery method and apparatus. The method comprises the steps of recording and storing PCE LSP information created by a path computation element (PCE) in advance; after completing the GR of a node, determining the presence of a PCE LSP unsuccessfully recovered according to the recorded PCE LSP information; and if so, notifying a path computation client (PCC) of the node to delete LSP data corresponding to the PCE LSP according to the recorded LSP information. The invention can ensure that the LSP supports increment synchronization in the GR process and further ensure a stable state of the LSP in the GR process, so as to significantly reduce the amount of data to be synchronized between the PCC and the PCE, reduce the amount of communication to be synchronized between the PCC and the PCE, and save the network overhead and network bandwidth.
Description
technical field [0001] The invention relates to the field of data network communication, in particular to a recovery method and device for a smooth restart GR of a label switching path LSP. Background technique [0002] In the Multiprotocol Label Switching (MPLS: MultiprotocolLabelSwitching) network, for the Resource Reservation Protocol (RSVP: ResourceReservationProtocol) tunnel head node to graceful restart (GR: Graceful Restart), RFC5063 stipulates to rely on the downstream recovery path (recovery-path) for recovery. In an MPLS network that supports Path Computation Element (PCE: PathComputationElement), after the GR restart occurs at the head node of the RSVP tunnel, except for the protocol data on the RSVP side that needs to be restored, the status of the Path Computation Element PCE and the Path Computation Client (PCC: PathComputationClient) Synchronization is also a part of recovery. For PCC and PCE sessions that do not support incremental synchronization, after the ...
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