单选题What is the Cisco IOS command to turn on explicit null forwarding by LDP？（）Aldp explicit-nullBmpls forwarding explicit-nullCmpls ldp advertise-labels explicit nullDmpls ldp explicit-null
单选题
What is the Cisco IOS command to turn on explicit null forwarding by LDP？（）
A
ldp explicit-null
B
mpls forwarding explicit-null
C
mpls ldp advertise-labels explicit null
D
mpls ldp explicit-null
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