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Version 2.0.0-pre1 (2017-04-29)
  o Support for MPLS next hops
  o VPNv4 and VPNv6 network types
  o BGP with MPLS labels (RFC 3107)
  o BGP MPLS/VPN support (RFC 4364)
  o BGP 6PE - IPv6 NLRI over IPv4 MPLS (RFC 4798)
  o BGP IPv4 NLRI with an IPv6 Next Hop (RFC 5549)
  o BGP Confederations (RFC 5065)
  o BGP: Simplify igp table options
  o BGP: Allow exchanging LOCAL_PREF with eBGP peers
  o BGP: Allow to specify interface for regular sessions
  o Babel support restored
  o Static: Minor overhaul
  o Netlink: Default kernel metric changed to 32
  o Flowspec: Limit tcp mask length to 12 bits
  o Flows and ROAs no longer use phony next hops
  o Update of show route command

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Version 2.0.0-pre0 (2016-12-07)
  o Integrated IPv4 + IPv6 design
  o Major BGP protocol redesign
  o BGP multicast support (SAFI 2)
  o BGP flowspec support (RFC 5575)
  o New RPKI-Router protocol
  o New build system
  o Unit tests

  Notes:

  Protocols and tables are now connected using explicit channels, most related
  protocol options (table, import, export, ...) are now channel options. See
  doc/bird.conf.example2 for configuration examples.


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Version 1.6.3 (2016-12-21)
  o Large BGP communities
  o BFD authentication (MD5, SHA1)
  o SHA1 and SHA2 authentication for RIP and OSPF
  o Improved documentation
  o Several bug fixes

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Version 1.6.2 (2016-09-29)
  o Fixes serious bug introduced in the previous version

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Version 1.6.1 (2016-09-22)
  o Support for IPv6 ECMP
  o Better handling of IPv6 tentative addresses
  o Several updates and fixes in Babel protocol
  o Filter: New !~ operator
  o Filter: ASN ranges in bgpmask
  o KRT: New kernel protocol option 'metric'
  o KRT: New route attribute 'krt_scope'
  o Improved BIRD help messages
  o Fixes memory leak in BGP multipath
  o Fixes handling of empty path segments in BGP AS_PATH
  o Several bug fixes

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Version 1.6.0 (2016-04-29)
  o Major RIP protocol redesign
  o New Babel routing protocol
  o BGP multipath support
  o KRT: Add support for plenty of kernel route metrics
  o KRT: Allow more than 256 routing tables
  o Static: Allow to specify attributes for static routes
  o Static: Support for BFD controlled static routes
  o FreeBSD: Setup password for BGP MD5 authentication
  o IO: Remove socket number limit
  o Plenty of bug fixes

  Upgrade notes:

  For RIP, most protocol options were moved to interface blocks.


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Version 1.5.0 (2015-04-20)
  o Major OSPF protocol redesign.
  o OSPFv2 multi-instance extension (RFC 6549).
  o BGP AS-wide unique router ID (RFC 6286).
  o BGP enhanced route refresh (RFC 7313).
  o Link state support in BGP.
  o Latency tracking and internal watchdog.
  o Uses high port range for BFD on BSD.
  o Increase max symbol length to 64.
  o Allows to define unnamed protocols from templates.
  o Fixes two serious bugs in BGP.
  o Several bugfixes and minor improvements.
  o Several minor option changes:
     - OSPF: Protocol-wide 'instance id' option added.
     - BGP: Parameters to option 'neighbor' extended.
     - BGP: Separate option 'interface' added.
     - BGP: Option 'start delay time' renamed to 'connect delay time'.
     - BGP: Option 'route limit' deprecated.

  Upgrade notes:

  For OSPF, there are deep internal changes, but user-visible changes
  are limited to log messages and minor changes in formatting of command
  output.

  For BGP, version 1.5.0 is essentially a minor release. There are two
  deprecated options ('start delay time' and 'route limit') and some
  minor formatting changes.

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Version 1.4.5 (2014-10-06)
  o New 'show route noexport' command option.
  o Port option for BGP sessions.
  o Better constant handling in set literals.
  o Better rate filtering of log messages.
  o Several minor bugfixes.

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Version 1.4.4 (2014-07-09)
  o Extended OSPF multipath support.
  o Default router preference for RAdv.
  o Significant changes in socket layer.
  o Important bugfix in BGP.
  o Several minor bugfixes.

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Version 1.4.3 (2014-04-14)
  o Important bugfix in IPv6 BGP.

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Version 1.4.2 (2014-04-02)
  o Important bugfix in BFD.

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Version 1.4.1 (2014-03-31)
  o BGP add-path support (RFC draft).
  o BGP graceful restart (RFC 4724).
  o OSPF: many changes in socket layer.
  o OSPF: support for secondary addresses in BSD.
  o OSPF: names for vlink pseudointerfaces (vlinkX).
  o Several bugfixes.

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Version 1.4.0 (2013-11-25)
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  o BFD protocol (RFC 5880).
  o BFD support for OSPF and BGP.
  o New 'allow local as' option for BGP.
  o Filters allows setting gw, ifname and ifindex.
  o Filter operator 'delete/filter' extended to bgp_paths.
  o Filter operator 'len' extended to [e]clists.
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  o BIRD client now allows shorthands for noninteractive commands.
  o Flag -P for PID file support.
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  o Flag -f added to force BIRD to run in foreground.
  o Protocol export/import/receive limits are checked during reconfiguration.
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  o Several bugfixes and minor improvements.
  o Several minor but incompatible changes:
     - IBGP is multihop by default.
     - Changes primary address selection on BSD to the first one.
     - Integers in filters are handled as unsigned.
     - ISO 8601 time formats used by default.
     - Import of device routes from kernel protocol allowed.
     - Last state change now tracks just protocol state change.
     - Minor changes to default router ID calculation.
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Version 1.3.11 (2013-07-27)
  o OSPF stub router option (RFC 3137).
  o TTL security for OSPF and RIP.
  o Protocol packet priority and traffic class handling.
  o Multiple routing tables support for FreeBSD and OpenBSD.
  o Extends constants to all filter data types.
  o Implements eval command.
  o 'bgppath ~ int set' filter operation.
  o Several bugfixes.

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Version 1.3.10 (2013-04-30)
  o Lightweight BIRD client for embedded environments.
  o Dynamic IPv6 router advertisements.
  o New 'next hop keep' option for BGP.
  o Smart default routing table for 'show route export/preexport/protocol'.
  o Automatic router ID selection could be configured to use address of loopback.
  o Allows configured global addresses of NBMA neighbors in OSPFv3.
  o Allows BIRD commands from UNIX shell even in restricted mode.
  o Route limits inherited from templates can be disabled.
  o Symbol names enclosed by apostrophes can contain dots.
  o Several bugfixes.

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Version 1.3.9 (2013-01-11)
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  o BIRD can be configured to keep and show filtered routes.
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  o Separate receive and import limits.
  o Several new reconfiguration cmd options (undo, timeout, check).
  o Configurable automatic router ID selection.
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  o Dragonfly BSD support.
  o Fixed OSPFv3 vlinks.
  o Several minor bugfixes.

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Version 1.3.8 (2012-08-07)
  o Generalized import and export route limits.
  o RDNSS and DNSSL support for RAdv.
  o Include in config file support wildcards.
  o History deduplication in BIRD client.
  o New route attributes krt_source, krt_metric.
  o Different instance ID support for OSPFv3.
  o Real broadcast mode for OSPFv2.
  o Several minor bugfixes.
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Version 1.3.7 (2012-03-22)
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  o Route Origin Authorization basics.
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  o RIPng working again.
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  o Extended clist operations in filters.
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  o Fixes several bugs in BSD iface handling.
  o Several minor bugfixes and enhancements.

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Version 1.3.6 (2012-01-20)
  o Important bugfix in BGP.

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Version 1.3.5 (2012-01-10)
  o Protocol templates.
  o Deterministic MED option for BGP.
  o Support for link-local addresses in BGP and static protocols.
  o Several bugfixes.

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Version 1.3.4 (2011-10-10)
  o Static recursive routes.
  o Several bugfixes.

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Version 1.3.3 (2011-09-11)
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  o OSPF NSSA.
  o BGP extended communities.
  o BGP TTL security.
  o Configuration option "include" added (based on patch from Alexander V. Chernikov).
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  o Some minor bugfixes.

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Version 1.3.2 (2011-07-08)
  o Allows run with restricted privileges.
  o Community list filter operation.
  o Fixes several problems in filter syntax:
     - Fixes several conflicts in the grammar.
     - Fixes a bug in (a..b, c) pair patterns.
     - Makes pair patterns orthogonal.
     - Allows term expressions in pair patterns without additional ( ).
     - Allows several comma separated values in switch cases.
  o Many bugfixes.

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Version 1.3.1 (2011-05-02)
  o Added Linux kernel route attributes krt_prefsrc and krt_realm.
  o Added BGP option 'med metric' related to MED handling.
  o Allows to use constants from /etc/iproute2/rt_* files.
  o Several bugfixes.

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Version 1.3.0 (2011-03-31)
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  o Proper iBGP (can be used with IGP).
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  o Multipath support (OSPF and static).
  o L2 link state detection.
  o IPv6 router advertisements.
  o Much improved OSPF reconfiguration.
  o Point-to-MultiPoint interfaces (OSPF).
  o Minor changes and improvements in config file grammar.
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  o Better community list matching.
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  o Changes default behavior of BGP IPv6 socket to v6only.
    Use 'listen bgp dual' for the old behavior.
  o Changes default for handling missing link-local addresses on
    route servers. Use 'missing lladdr drop' for the old behavior.
  o Important bugfix for OSPF.
  o Several minor bugfixes.

Version 1.2.5 (2010-10-10)
  o Several mostly minor bugfixes.

Version 1.2.4 (2010-08-03)
  o Added 'show memory' command.
  o Important bugfix in IPv6 BGP.
  o Several minor bugfixes.

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Version 1.2.3 (2010-06-01)
  o Pattern matching for community lists.
  o Many fixes in OSPF protocol (esp. in multi-areas and vlinks).
  o Several minor bugfixes.

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Version 1.2.2 (2010-04-10)
  o Much better BSD kernel support (IPv6, alien routes, ...).
  o Deep OSPF socket changes, fixes OSPFv2/v3 behavior on BSD.
  o OSPFv2 in Linux now supports more non-stub IP prefixes
    on one physical iface.
  o Export of device routes to the kernel is more restricted.
  o Routes with strange scope not allowed in BIRD routing tables.
  o New filterable route attributes bgp_originator_id,
    bgp_cluster_list and ospf_router_id.
  o Restricted read-only CLI (option -r).
  o Pattern matching for 'show protocols' command.
  o BGP protocol details in 'show protocols all' command.
  o Configurable syslog name (and default on IPv6 changed).
  o Statistic counters for pipes were fixed.
  o Many bugfixes in BGP, OSPF, filters, ...

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Version 1.2.1 (2010-02-11)
  o Option 'interpret communities' allows to override implicit handling
    of well-known communities.
  o 'configure' command uses route reload when filters change.
  o Adds router ID of advertising router as OSPF route attribute.
  o 'show route' command indicates primary route and shows OSPF Router ID.
  o Configurable date/time formats.
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  o Symbol names can be enclosed by '' and so include hyphen and start with number.
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  o Several minor bugfixes.

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Version 1.2.0 (2010-01-05)
  o Implements OSPFv3 (IPv6 support for OSPF). Because the code is
    shared with OSPFv2 and there were deep changes in it, we suggest
    caution during upgrade to OSPF users. Some advanced features
    (like NSSA, vlinks and authentication) are not yet implemented.
  o Implements MRTdump - binary logging protocol compatible with other
    routing daemons. Only BGP part of MRTdump is yet implemented.
  o Changes default value of BGP attribute LOCAL_PREF from 0 to 100.
    Use 'default bgp_local_pref 0' BGP protocol option for the old
    behavior. The new value is suggested by RFC 4277.
  o Changes default mode of pipes from opaque to transparent.
    Use 'mode opaque' protocol option if the old behavior is needed.
    Opaque pipe mode is deprecated and might be removed in the future.

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Version 1.1.7 (2009-12-20)
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  o Implements BGP Route Refresh (RFC 2918).
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  o Implements route reload command.
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  o Deep changes and bugfixes in pipe protocol.
  o Bugfix in OSPF premature aging of LSA.
  o Bugfix in OSPF next hop calculation.
  o Bugfix in core related to route withdraws.
  o Several minor bugfixes.

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Version 1.1.6 (2009-11-19)
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  o Implements RFC 5004 - prefer older external routes.
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  o There is a change how route servers handle missing IPv6 link
    local addresses in next hop atribute - see 'missing lladdr'
    option.
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  o Several minor features (description field, parse check option).
  o Several minor bugfixes.

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Version 1.1.5 (2009-10-29)
  o Better scalability of BGP.
  o New accessors for AS path - first and last.
  o Allows to set protocol-specific router ID.
  o Allows import kernel 'onlink' routes.
  o Endianity check in buildsystem changed.

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Version 1.1.4 (2009-10-02)
  o BGP passive option.
  o Several minor bugfixes.

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Version 1.1.3 (2009-09-11)
  o Bugfix in core
  o Bugfix in BGP related to AS2->AS4 conversion.

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Version 1.1.2 (2009-08-23)
  o Allow more kernel routing tables in IPv6.
  o Bugfix in core

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Version 1.1.1 (2009-08-14)
  o 'more' style paging in BIRD client.
  o Important core bug fixed.
  o Portability to non-x86 related bugfixes.
  o As usual, miscellaneous bugfixes.

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Version 1.1.0 (2009-06-28)
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  o Parametrized pair and path mask expressions in the filter language.
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  o Transparent pipe mode allows to implement BGP route server with
    independent route policy for each peer.
  o Kernel route table synchronization does not allow overwriting
    of alien routes.
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  o Configurable BGP import route limits.
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  o During BGP error delay, incoming connections are rejected.
  o BGP route statistics.
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  o Better support for multiple network addresses on OSPF interfaces.
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  o As usual, miscellaneous bugfixes.

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Version 1.0.15 (2009-05-25)
  o FreeBSD and NetBSD port renewed. OpenBSD port introduced.
  o import/preimport 'show route' modifiers was renamed to export/preexport
    for consistency with filters.
  o Minor change in the grammar of 'interface' config option.
  o Many bugfixes in IPv6 BGP.
  o As usual, miscellaneous bugfixes.

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Version 1.0.14 (2009-04-28)
  o A lot of bugfixes in BGP, OSPF and core.
  o A bugfix in filters in the pipe protocol. It is recommended to
    check whether the new behavior of used pipe filters is consistent
    with expectations.
  o Reimplementation of prefix sets and a slight change in the meaning
    of some prefix set patterns.

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Version 1.0.13 (2009-03-14)
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  o A lot of bugfixes in BGP, OSPF and core
  o A new syntax for BGP masks

Version 1.0.12 (2008-11-12)
  o new BGP features: BGP MD5, ASN32, BGP route reflector
  o BGP bugfixes

...

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Version 1.0.9 (2004-07-15)
  o  Minor bugfix in RIP
  o  A lot of OSPF code rewritten, OSPF supports multiple areas,
     virtual links, MD5 authentication. It is fully compatible
     with rfc2329.

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Version 1.0.8 (2004-06-07)
  o  A lot of bug fixes in RIP, OSPF and BGP (thanx to Andreas Steinmetz)
  o  FreeBSD and NetBSD port introduced
  o  Complete code clean up

Version 1.0.7 (2003-08-20)
  o  OSPF bug fixes

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Version 1.0.6 (2003-04-06)
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  o  No more byte order problems in RIP authentication. Thanks to
     Eric Leblond <eleblond@init-sys.com> for a patch.
  o  Fixed interoperability problems with Cisco and Zebra when talking
     IPv6 BGP.
  o  Handle more primary addresses with different scopes gracefully.
     IPv6 needs that.
  o  Comparison of prefixes in filters doesn't ignore their lengts.
  o  As usually, OSPF bug fixes.
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  o  Documentation building tools now work with recent linuxdoc-tools.
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Version 1.0.5 (2001-06-09)

  o  Minor cleanups in the libraries.
  o  Removed a couple of warnings when compiling with newer glibc.
  o  OSPF bug fixes.

Version 1.0.4 (2000-09-04)

  o  Fixed a serious bug in 1.0.3.

Version 1.0.3 (2000-09-03)

  o  OSPF works better on NBMA networks. Some configuration tags added.

Version 1.0.2 (2000-08-24)

  o  Minor bug fixes to OSPF.

Version 1.0.1 (2000-06-22)

  o  Updated documentation and fixed a couple of bugs.

Version 1.0.0 (2000-06-09)

  o  First stable release.

Version 0.0.0 (2000-05-13)

  o  First public development release.