| 摘要 |
Paths in a transport network are identified by labels (n1-n4, b1-b4) and more than one restoration resources that can be used for setting up a particular backup path form a restoration group. Backup tables (R1, R7) are provided, which define restoration groups per path labels (b1-b4), only, rather than individual restoration resources. Upon initial receipt of a path label (b1-b4), a network element (1-13) selects according to pre-determined rules a particular restoration resource from the restoration group defined in the backup table (R1-R7) for this backup path label.
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