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- RFC 2281
- 使用UDP Port 1985 發送到224.0.0.2
- 同一HSRP群組內,有一台Active HSRP Router跟一台Standby HSRP Router
- 優先權範圍0~255,越高越好,預設值為100。
- 狀態:Disabled->Init->Listen->Speak->Standby->Active
- Initial -> State from which the router begin the HSRP Process
- Standby-> A candidate to become the next active router
- Learn-> The router is still waiting to hear from the active router
- Active-> The router is current forwarding packets
- Listen-> Listens for hello messages from the active and standby routers
- Speak-> Participates in the election for the active or standby router
- 驗證:Plain-Text & MD5
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