题目
B.nIn 1+1 T-MPLS path protection structure, if a unidirectional fault (transmission direction from node A to Z) occurs to working connection, it will be detected at sink node Z of protecting domain and then node Z selector will switch to protection connectio
C.n1+1 T-MPLS path protection is of unidirectional switching type -- that is to say, only the affected end needs to switch to the protection path and selectors at the two ends are relatively independent.
D.nIn 1+1 T-MPLS path protection structure, to avoid single-point fault, working connection and protection connection should run along isolated routes.
第1题
B.When 1+1 T-MPLS is in unidirectional protection switching mode, the protection switching is completed by sink selector of protection domain totally based on local (protection sink) info.
C.1+1 T-MPLS work (protected) services bridge work connection and protection connection permanently at source end of protection domain.
D.Connectivity check (CC) only performs check to currently active LSP.
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