CISCO IOS NETFLOW OVERVIEW
說真的，在我尋找重點的同時，我深深地覺得CCIE出題目的考官已經幾近瘋狂，各位可以發現我現在找到的相關資料已經幾乎都不在Cisco Press的書籍範圍內，而是來自於各時期Cisco Seminar PPT/PDF或Document CD中的某段文字內容，也就是說如果你沒有考古題也沒有看額外的Cisco Tech PowerPoint Slide，那有很大的機會是你從來沒有看過的題目及答案內容(就算有看過也記不得這麼清楚吧…)，我想這也是為什麼考古題市場會這麼大的原因，不看考古題去應考那就是跟"錢"過不去，因為這已經不是考驗實力了…，追根究底還是因為出題目的人員並沒有花心思設計題目來考驗應考者的實力，而是從五花八門的Tech Material中直接Copy & Paste，這也難怪CCIE Written常常題目跟答案牛頭不對馬嘴…花了很多時間整理順便發發牢騷，請包涵~
Cisco IOS NetFlow Origination
• Developed and patented at Cisco® Systems in 1996
• NetFlow is now the primary network accounting technology in the industry
• Answers questions regarding IP traffic: who, what, where, when, and how
• Provides a detailed view of network behavior
...(略)
NetFlow Principles
• Inbound traffic only today
• Unidirectional flow
• Accounts for both transit traffic and traffic destined for the router
• Works with Cisco Express Forwarding or fast switching
=> Not a switching path
• Supported on all interfaces and Cisco IOS Software hardware products
• Returns the sub-interface information in the flow records
...(略)
NetFlow Versions
Version 1: Original
Version 5: Standard and most common
Version 7: Specific to Cisco Catalyst 6500 and 7600 Series Switches. Similar to Version 5, but does not include AS,interface, TCP Flag & TOS information
Version 8: Choice of eleven aggregation schemes.Reduces resource usage
Version 9: Flexible, extensible file export format to enable easier support of additional fields & technologies; coming out now MPLS, Multicast, & BGP Next Hop
...(略)
Cisco IOS NetFlow Origination
• Developed and patented at Cisco® Systems in 1996
• NetFlow is now the primary network accounting technology in the industry
• Answers questions regarding IP traffic: who, what, where, when, and how
• Provides a detailed view of network behavior
...(略)
NetFlow Principles
• Inbound traffic only today
• Unidirectional flow
• Accounts for both transit traffic and traffic destined for the router
• Works with Cisco Express Forwarding or fast switching
=> Not a switching path
• Supported on all interfaces and Cisco IOS Software hardware products
• Returns the sub-interface information in the flow records
...(略)
NetFlow Versions
Version 1: Original
Version 5: Standard and most common
Version 7: Specific to Cisco Catalyst 6500 and 7600 Series Switches. Similar to Version 5, but does not include AS,interface, TCP Flag & TOS information
Version 8: Choice of eleven aggregation schemes.Reduces resource usage
Version 9: Flexible, extensible file export format to enable easier support of additional fields & technologies; coming out now MPLS, Multicast, & BGP Next Hop
...(略)
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