How is an RSVP resv message sent back to the ingress router?（）
- A、reverse path of the RRO
- B、least cost to the ingress router
- C、shortest path to the egress router
- D、reverse path of the path vector TLV
正确答案:A
答案解析:有
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How is an RSVP resv message sent back to the ingress router?（）
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