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