Tim's Technology Journey Wiki

BGP Fundamentals Lesson 1

BGP is a Answer path-vector routing protocol.
BGP message types:
1. OPEN
2. UPDATE
3. NOTIFICATION
4. Answer KEEPALIVE
This BGP attribute ensure a loop-free path for routes. Answer AS_PATH
For more scalability and configurability Answer address-family configuration is used.
AFI
1. Identifies the Answer protocol
2. Correlates to a specific Answer network protocol such as:
  1. Answer IPv4
  2. Answer IPv6
  3. Answer VPN, and so on
BGP Identifier 
- When the RID is changed, BGP sessions will reset and reestablish.
1. IOS Order of precedence:
  1. Answer Highest IP address of the Answer loopback interfaces that are Answer up .
  2. Answer Highest IP address of the Answer interfaces that are Answer up .
2. IOS-XR order of precedence:
  1. Answer Lowest IP address of the Answer loopback interfaces that are Answer up .
  2. Otherwise, a value of Answer 0.0.0.0 will be set and no neighborships will form.