Which of the following statements about the working principle of LDP FRR are true?
A . After LDP FRR is enabled, a backup LSP is generated. Both the primary and backup LSPs are stored in the forwarding table.
B . LDP FRR can be deployed on the ingress node and the intermediate node. The primary and backup LSPs are recorded in the ILM table on the intermediate node and in the FIB table on the ingress node.
C . Multiple LSPs can be backed up on the ingress node, that is, entries about multiple backup LSPs are generated in the forwarding table according to the priority of the LDR FRR, implementing multilayer protection.
D . After LDP FRR is enabled, a backup LSP can be generated for a primary LSP to prevent serious packet loss during fast flapping of the primary LSP
Answer: A, B