open-source implementations of BGP include: BIRD, a GPL routing package for Unix-like systems. FRRouting, a fork of Quagga for Unix-like systems ; and its ancestors: Quagga, a fork of GNU Zebra for Unix-like systems (no longer developed). GNU Zebra, a GPL routing suite supporting BGP4 (decommissioned). OpenBGPD, a BSD-licensed implementation by the OpenBSD team. XORP, the eXtensible Open Router Platform, a BSD-licensed suite of routing protocols. Systems for testing BGP conformance, load or stress performance come from vendors such as: Agilent Technologies GNS3 open source network simulator Ixia Spirent Communications Standards documents , Application of the Border Gateway Protocol in the Internet Protocol (BGP-4) using SMIv2 , BGP Communities Attribute , BGP Route Flap Damping , Route Refresh Capability for BGP-4 , NOPEER Community for Border Gateway Protocol (BGP) Route Scope Control , A Border Gateway Protocol 4 (BGP-4) , BGP Security Vulnerabilities Analysis , Definitions of Managed Objects for BGP-4 , BGP-4 Protocol Analysis , BGP-4 MIB Implementation Survey , BGP-4 Implementation Report , Experience with the BGP-4 Protocol , Standards Maturity Variance Regarding the TCP MD5 Signature Option (RFC 2385) and the BGP-4 Specification , BGP Extended Communities Attribute , BGP Route Reflection – An Alternative to Full Mesh Internal BGP (iBGP) , Graceful Restart Mechanism for BGP , Multiprotocol Extensions for BGP-4 , Autonomous System Confederations for BGP , Capabilities Advertisement with BGP-4 , Dissemination of Flow Specification Rules , IPv6 Address Specific BGP Extended Community Attribute , BGP Support for Four-Octet Autonomous System (AS) Number Space , IANA Registries for BGP Extended Communities , Revised Error Handling for BGP UPDATE Messages , North-Bound Distribution of Link-State and Traffic Engineering Information Using BGP , Advertisement of Multiple Paths in BGP , BGP Large Communities Attribute , Use of BGP Large Communities , Policy Behavior for Well-Known BGP Communities draft-ietf-idr-custom-decision-08 – BGP Custom Decision Process, Feb 3, 2017 Selective Route Refresh for BGP, IETF draft , Obsolete – Border Gateway Protocol (BGP) , Obsolete – A Border Gateway Protocol 4 (BGP-4) , Obsolete – Application of the Border Gateway Protocol in the Internet , Obsolete – Definitions of Managed Objects for the Fourth Version of the Border Gateway , Obsolete – A Border Gateway Protocol 4 (BGP-4) , Obsolete – Autonomous System Confederations for BGP , Obsolete – BGP Route Reflection An Alternative to Full Mesh iBGP , Obsolete – Multiprotocol Extensions for BGP-4 , Obsolete – Autonomous