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https://tools.ietf.org/html/rfc4893
RFC 4893 BGP Support for Four-octet AS Number Space May 2007 remained unmodified since the route left the last NEW BGP speaker. The trailing AS path information (representing autonomous systems with 2-octet AS numbers and OLD BGP speakers only) is contained only in the current AS_PATH attribute (encoded in the leading part of the AS_PATH attribute).Cited by: 62
https://tools.ietf.org/html/rfc6793
RFC 6793 BGP Support for 4-Octet AS Number Space December 2012 The capability that is used by a BGP speaker to convey to its BGP peer the four-octet Autonomous System number capability also carries the AS number (encoded as a four-octet entity) of the speaker in the Capability Value field of the capability. The Capability Length field of the capability is set to 4.Cited by: 8
https://datatracker.ietf.org/doc/rfc4893/
Network Working Group Q. Vohra Request for Comments: 4893 Juniper Networks Category: Standards Track E. Chen Cisco Systems May 2007 BGP Support for Four-octet AS Number Space Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements.
https://datatracker.ietf.org/doc/rfc6793/
3. Protocol Extensions For the purpose of this document, we define a BGP speaker that does not support the new four-octet AS number extensions as an OLD BGP speaker, and a BGP speaker that supports the new four-octet AS number extensions as a NEW BGP speaker.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/irg-xe-3s-book/irg-4byte-asn.pdf
BGP Support for 4-byte ASN TheCiscoimplementationof4-byteautonomoussystem(AS)numbersusesasplain(65538,forexample ...
https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/border-gateway-protocol-bgp/white_paper_c11-516826.html
Jul 26, 2017 · RFC4893 (BGP Support for Four-octet AS Number Space) describes the compatibility between OLD and NEW BGP speakers and allows a gradual transition from a 2-octet supporting router, towards 4-octet supporting router. Even though there is a high degree of compatibility, it is desirable to understand some specific considerations when operating OLD ...
https://networklessons.com/bgp/bgp-4-byte-number
BGP speakers that support 4-byte AS numbers advertise this via BGP capability negotiation and there is backward compatibility. When a “new” router talks to an “old” router (one that only supports 2-byte AS numbers), it can use a reserved AS number (23456) called …
https://www.rfc-archive.org/getrfc.php?rfc=4893
RFC 4893 BGP Support for Four-octet AS Number Space May 2007 remained unmodified since the route left the last NEW BGP speaker. The trailing AS path information (representing autonomous systems with 2-octet AS numbers and OLD BGP speakers only) is contained only in the current AS_PATH attribute (encoded in the leading part of the AS_PATH attribute).
https://www.dell.com/support/manuals/us/en/04/networking-z9100/z9100-on-9.10.0.0-cli-pub/about-this-guide
bgp four-octet-as-support. bgp graceful-restart. bgp non-deterministic-med. bgp recursive-bgp-next-hop. bgp regex-eval-optz-disable. bgp router-id. clear ip bgp. clear ip bgp dampening. clear ip bgp flap-statistics. clear ip bgp peer-group. debug ip bgp. debug ip bgp dampening. debug ip bgp events.
https://en.wikipedia.org/wiki/Border_Gateway_Protocol
Border Gateway Protocol (BGP) is a standardized exterior gateway protocol designed to exchange routing and reachability information among autonomous systems (AS) on the Internet. The protocol is classified as a path vector protocol. The Border Gateway Protocol makes routing decisions based on paths, network policies, or rule-sets configured by a network administrator and is involved in making ...
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