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4.1 Working and Recovery LSP/Span 4.2 Traffic Types: normal, extra, null 4.3 LSP/Span Protection and Restoration 4.4 Recovery Scope: local/span, segment, end-to-end 4.5 Recovery Domain 4.6 Recovery Types: 1+1, 0:1 (unprotected), 1:1, 1:N, M:N 4.7 Bridge Types: permanent, broadcast, selector 4.8 Selector Types: selective, merging 4.9 LSP/Span Nodes: ingress, egress, intermediate 4.10 Switching Mechanism: for selector vs. bridge 4.11 Reversion operations Section 4 Content (1)