BGP implementations

The following products support four-byte AS numbers:

• Quagga (patches to 0.99.6)
• Quagga patches
• OpenBGPD (patches to 3.9, 4.0)
• OpenBGPD patches
• JUNOSe 4-1-0 and later
• JunOS 9.1 and later
• Cisco IOS-XR 3.4 and later
• Cisco NX-OS 4.0(1) and later
• Cisco IOS 12.0(32)S12 for 7200 and GSR only
• Redback SEOS (all supported versions)
• Force10 Networks ( FTOS 7.7.1.0 and later )

Other products that support four-byte AS numbers

Routing registries and other routing products:

• RIPE whois database server and client
• IRRd accepts and indexes ASDOT format AS numbers from mirrored databases. The parser for submissions to local databases does not yet accept four-byte AS numbers
• Routing Information Service

Whois-related software:

• ARIN whois
• LACNIC whois
• RIPE whois database server and client

Note: Researchers who import data from whois reports may also need to update their code to accept data about 4-byte AS numbers.

Documents and reports

• 2-byte AS number report: A status report on two-byte AS number assignments and a projection of run out of this number pool
• AS number report: A status report on the 4-byte AS number space
• Exploring Autonomous System numbers: a description of the role of AS numbers in inter-domain routing, and BGP in particular
• 4-byte AS numbers: a description of how BGP is altered to support 4-byte AS numbers, and how backwards compatibility is supported in BGP
• 32-bit AS numbers - The view from the old BGP world: A description of the network operational components that a network operator may want to review when their customers, peers or upstreams start using a 4-byte AS number