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Authors:
James F. Kurose, Keith W. Ross
Chapter:
The Network Layer
Exercise:
Problems
Question:35 | ISBN:9780132856201 | Edition: 6

Question

Describe how loops in paths can be detected in BGP.

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Answer

The loops in the BGP (Border Gateway Protocol) can be detected as follows:

  • The BGP protocol propagates and obtains reachability of all the neighboring AS (Autonomous Systems).
  • The attributes AS-PATH and NEXT-HOP are used for routing.
  • The router verifies all the AS numbers. If it finds its own number, it will discard the advertisement to prevent the looping. In this way BGP detects the loops and prevents them.
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