The OSPF RFC 3623 Graceful Restart feature allows you to configure IETF NSF in ultivendor networks. When using OSPF Graceful Restart，which mechanism is used tocontinue forwarding packets during a switchover？（）
- A、Reverse Path Forwarding
- B、Hardware-based forwarding
- C、UDP forwarding
- D、Layer 2 Forwarding
正确答案:B
答案解析:有
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