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A recovery method and device for a smooth restart GR of a label switching path LSP
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A label switching path and smooth restart technology, applied in the recovery field of smooth restart GR, can solve the problem of not knowing the existence of LSP, and achieve the effect of saving network bandwidth, saving network overhead, and reducing traffic
Active Publication Date: 2020-08-04
NANJING ZHONGXING SOFTWARE
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Problems solved by technology
However, for the LSP actively created by the PCE, RSVP does not know the existence of the LSP until the LSP GR 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 PCE LSP created by the PCE.
[0027] Among them, the information of the PCE LSP (indicates the LSP created by the PCE, and the following PCE LSPs all indicate this meaning) is stored in a storage location that is not affected by GR. For example, for the GR of the main board, it 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 PCE LSP that has not been recovered successfully according to the recorded information of the PCE LSP.
[0030] Step 103: If there is a PCE LSP that h...
Embodiment 2
[0042] Such as 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 PCE LSP created by the path computation unit PCE;
[0044] Among them, the information of the PCE LSP (indicates the LSP created by the PCE, and the following PCE LSPs all indicate this meaning) is stored in a storage location that is not affected by GR. For example, for the GR of the main board, it 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...
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Abstract
The present invention provides a recovery method and device for a smooth restart GR of a label switched path LSP. The method includes: pre-recording and saving the information of the PCE LSP created by the path calculation unit PCE; when the node GR is completed, according to the recorded PCE LSP information to determine whether there is an unsuccessfully restored PCE LSP; if there is an unsuccessfully restored PCE LSP, then according to the recorded LSP information, notify the path calculation client PCC of this node to delete the LSP data corresponding to the PCE LSP. In the present invention, it can be guaranteed that the LSP supports incremental synchronization during the GR process, further ensuring the stability of the state of the LSP during the GR process, thereby significantly reducing the amount of data that needs to be synchronized between the PCC and the PCE, and reducing the synchronization between the PCC and the PCE. Inter-synchronized traffic, saving 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: Multiprotocol Label Switching) network, for the Resource Reservation Protocol (RSVP: Resource Reservation Protocol) tunnel head node to gracefully restart (GR: Graceful Restart), RFC5063 stipulates that relying on the downstream recovery path (recovery-path ) to restore. In an MPLS network that supports Path Computation Element (PCE: Path Computation Element), 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 Path Computation Element PCE and the Path Computation Client (PCC: Path Computation Client) ) state synchronization is also a part of the recovery. For the PCC and PCE sessions that do not support incremental synchroniz...
Claims
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