What change was made to BGP to address the expected depletion of autonomous system numbers?

Last Updated: May 19, 2021
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What change was made to BGP to address the expected depletion of autonomous system numbers?

  • the ability to incorporate hierarchical network design
  • the use of a 2-octet autonomous system number
  • the use of a 4-octet autonomous system number
  • the ability to use RFC 1918 address space

Explanation: Autonomous system number (ASN) was originally 2 bytes (16-bit range) long, which made 65,535 ASNs possible. Due to exhaustion, RFC 4893 expanded the ASN field to accommodate 4 bytes (32-bit range). This allows for 4,294,967,295 unique ASNs.

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