Which of the following potential BGP enhancements were documented in the BGP Add-Paths proposal? (Select the best answer.)

Last Updated on August 7, 2021 by Admin 3

Which of the following potential BGP enhancements were documented in the BGP Add-Paths proposal? (Select the best answer.)

  • possible modifications to the best-path algorithm
  • possible software upgrades for PE routers
  • possible addition of a session between a route reflector and its client
  • possible addition of a four-octet Path Identifier
Explanation:
The BGP Add-Paths proposal proposed the possible addition of a four-octet Path Identifier to Network Layer Reachability Information (NLRI) in order to enable Border Gateway Protocol (BGP) to distribute multiple paths. BGP as it is typically deployed has no mechanism for distributing paths that are not considered the best path between speakers.
Observations about the possible addition of a session between a router reflector and its client were documented in Request for Comments (RFC) 6774, which discusses the distribution of diverse BGP paths. Specifically, RFC 6774 observed that BGP as it is typically deployed has no mechanism for distributing paths that are not considered the best path between speakers. However, the possible addition of a session between a route reflector and its client could enable a BGP router to distribute alternate paths.
Neither the AddPaths proposal nor RFC 6774 document possible modifications to the bestpath algorithm or software upgrades for provider edge (PE) routers. Although RFC 6774 does discuss a possible means of distributing paths other than the best path, the means by which BGP determines the best path to a destination were not changed. Therefore, no software upgrade is required.

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