A network administrator is configuring BGP multipathing for paths learned from iBGP advertisement. What is a condition for additional paths to be considered equal to the best path?

Last Updated: May 14, 2021
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A network administrator is configuring BGP multipathing for paths learned from iBGP advertisement. What is a condition for additional paths to be considered equal to the best path?

  • The AIGP attribute must match.
  • The neighbor IP address must match.
  • The originated attribute must match.
  • The IGP cost must match for IBGP and EBGP.

Explanation: When you configure BGP multipathing, the additional paths need to match the following best-path BGP path attributes:
- Weight
- Local preference
- AS_Path length
- AS_Path content (although confederations can contain a different AS_CONFED_SEQ path)
- Origin
- MED
- Advertisement method (iBGP or eBGP) (If the prefix is learned from an iBGP advertisement, the IGP cost must match for iBGP and eBGP to be considered equal.)

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