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Authors:
James F. Kurose, Keith W. Ross
Chapter:
The Network Layer
Exercise:
Review
Question:30 | ISBN:9780132856201 | Edition: 6

Question

How does BGP use the NEXT-HOP attribute? How does it use the AS-PATH attribute?

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Answer

BGP protocol: BGP (Border Gateway Protocol) is an Inter-AS routing protocol. The two most important attributes are AS-PATH and NEXT-HOP.

  • The advertisement passed for the prefix values contains the AS’s in the AS-PATH.
  • The NEXT-HOP is the router interface that initiates the AS-PATH.
  • The routers also uses the AS-PATH attribute for mutliple paths.
  • The first router is configured in the forward table, the router uses the NEXT-HOP attribute.

 

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