单项选择题
A.BFD B.TUNNEL APS C.混合FRR D.PW APS
A.查看ETH_LINK_DOWN告警 B.查看TUNNEL_APS_DEGRADED告警 C.lsp traceroute D.lsp ping
A.Double帧 B.非成帧 C.CRC-4复帧
A.120；120 B.100；120 C.100；100 D.120；100
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