| 摘要 |
Paths may be advertised on a network implementing a link state routing protocol by using Path State Advertisements (PSAs) that are distributed in the same manner as link state advertisements. The path state advertisements contain path entries, each of which includes a globally unique path ID and path information such as a series of nodes or links that defines the path through the network. When a PSA is received by a network element, the network element will evaluate the path entries in the PSA to determine if the PSA is relevant and, if necessary, install forwarding state for the relevant path entries. PSAS not relevant to a network element are not used to affect forwarding state on the network element. Label based forwarding may be used by the network elements to forward data along the path, in which the globally unique path ID is used as the label.
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