| 摘要 |
The Label Distribution Protocol (LDP) specified by the IETF for the distribution of labels between Label-Switched Routers (LSRs) in a label-switched network uses a TCP session between LSR peers in order to distribute labels. TCP is notoriously difficult and inefficient to implement in a fault-tolerant manner, which means that LDP is not suitable for to use in a system that requires high-availability of the label distribution service. This also applies to the constraint-based variant of LDP, CR-LDP, also specified by the IETF, as it inherits the use of TCP sessions between LSR peers from the base LDP specification. The present invention enhances the LDP specification to allow LSR peers to recover from hardware or software faults that cause a failure of the TCP session between the LSR peers without the need for either peer to implement a fault-tolerant version of TCP.
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