SHARE
SPREAD
HELP

The Tradition of Sharing

Help your friends and juniors by posting answers to the questions that you know. Also post questions that are not available.

To start with, Sr2Jr’s first step is to reduce the expenses related to education. To achieve this goal Sr2Jr organized the textbook’s question and answers. Sr2Jr is community based and need your support to fill the question and answers. The question and answers posted will be available free of cost to all.

The pleasure of all reading is doubled when one lives with another who shares the same. -Katherine Mansfield

 

#
Authors:
James F. Kurose, Keith W. Ross
Chapter:
The Network Layer
Exercise:
Problems
Question:36 | ISBN:9780132856201 | Edition: 6

Question

Will a BGP router always choose the loop-free route with the shortest AS- path length? Justify your answer.

TextbookTextbookTextbookTextbookTextbookTextbookTextbookTextbookTextbookTextbookTextbookTextbookTextbookTextbookTextbookTextbookTextbook

Answer

BGP stands for Border Gateway Protocol. It contains the subnet reachability data from AS and maintain the data to reach all routers in AS. So, it is an Inter-AS routing protocol.

The following reasons are the BGP router always choose the loop-free route with the shortest AS- path length:

  • Generally, the router may contain more than one path to any one prefix.
  • In this case, the BGP can apply the some elimination rules to catch the one route.
  • These elimination rules obtained from the AS_PATH. It is an inter domain routing. Then choose the loop-free route with the shortest AS- path length.
0 0

Discussions

Post the discussion to improve the above solution.