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A Python tool to automatically build (and test) configurations for BGP route servers.

Project description


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A Python tool to automatically build (and test) feature-rich configurations for BGP route servers.

How it works

  1. Two YAML files provide general policies and clients configurations options:

      rs_as: 999
      router_id: ""
      add_path: True
          policy: "same-as"
        policy_ipv4: "rewrite-next-hop"
      - asn: 111
        - ""
        - "2001:db8:1:1::11"
            - "AS-AS111MAIN"
  2. ARouteServer acquires external information to enrich them: i.e. bgpq3 for IRRDb data, PeeringDB for max-prefix limit and AS-SETs, …

  3. Jinja2 built-in templates are used to render the final route server’s configuration file.

    Currently, BIRD (1.6.3) and OpenBGPD (OpenBSD 6.0 and 6.1) are supported.

Validation and testing are performed using the built-in live tests framework: Docker instances are used to simulate several scenarios, and more custom scenarios can be built on the basis of the user’s needs. More details on the Live tests section.


  • Path hiding mitigation techniques (RFC7947 section 2.3.1).
  • Filtering features (most enabled by default):
    • NEXT_HOP enforcement (strict / same AS - RFC7948 section 4.8);
    • minimum and maximum IPv4/IPv6 prefix length;
    • maximum AS_PATH length;
    • reject invalid AS_PATHs (containing private/invalid ASNs);
    • reject AS_PATHs containing transit-free ASNs;
    • RPKI-based filtering (RFC6811);
    • reject bogons;
    • prefixes and origin ASNs enforcing via RPSL/IRRdb AS-SETs (RFC7948 section 4.6.2);
    • max-prefix limit based on global or client-specific values or on PeeringDB data.
  • Blackhole filtering support:
    • optional NEXT_HOP rewriting;
    • signalling via BGP Communities (BLACKHOLE and custom communities);
    • client-by-client control over propagation.
  • Control and informative communities:
    • prefix/origin ASN present/not present in IRRDB data;
    • routes RPKI validity state;
    • do (not) announce to any / peer / on RTT basis;
    • prepend to any / peer / on RTT basis;
    • add NO_EXPORT / NO_ADVERTISE to any / peer;
    • custom informational BGP communities.
  • Optional session features on a client-by-client basis:
  • Automatic building of clients list:
  • Related tools:

A comprehensive list of features can be found within the comments of the distributed configuration file on GitHub or on the documentation web page.

More feature are already planned: see the Future work section for more details.

Full documentation

Full documentation can be found on ReadTheDocs:


  • RIPE74, 10 May 2017, Connect Working Group: video (9:53), slides (PDF)
  • Salottino MIX, 30 May 2017: slides


Beta testing, looking for testers and reviewers.

Anyone who wants to share his/her point of view, to review the output configurations or to test them is more than welcome!

Bug? Issues?

But also suggestions? New ideas?

Please create an issue on GitHub or drop me a message.


Pier Carlo Chiodi -

Blog: Twitter: @pierky

Change log


Upgrade notes: after upgrading, run the arouteserver setup-templates command to sync the local templates with those distributed with the new version. More details on the Upgrading section of the documentation.

next version

  • Python 3.4 support.

  • Improvement: GT registry removed from the sources used to gather info from IRRDB.

    Related: PR #8 on GitHub.

  • Improvement: multiple AS-SETs used for the same client are now grouped together and queried at one time. This allows to leverage bgpq3’s ability and speed to aggregate results in order to have smaller configuration files.


  • New feature: when IRRDB-based filters are enabled and no AS-SETs are configured for a client, if the cfg.filtering.irrdb.peering_db option is set ARouteServer tries to fetch their values from the client’s ASN record on PeeringDB.

    Related: issue #7 on GitHub.

  • Improvement: config building process performances,

    • reduced memory consumption by moving IRRDB information from memory to temporary files;
    • responses for empty/missing resources are also cached;
    • fix a wrong behaviour that led to multiple PeeringDB requests for the same ASN.
  • Improvement: clients-from-euroix command, the new --merge-from-peeringdb option can be used to integrate missing information into the output clients list by fetching AS-SETs and max-prefix limit from PeeringDB.


  • Fix: OpenBGPD, an issue was causing values > 65535 to be used in standard BGP communities matching.


  • Fix: remove quotes from clients description.
  • Fix: OpenBGPD, syntax error for prefix lists with ‘range X - X’ format.
  • Fix: clients-from-euroix command, members with multiple vlan objects with the same vlan_id were not properly listed in the output, only the first object was used.


  • Improvement: BIRD, new default debug options (states, routes, filters, interfaces, events, was all).

    If needed, they can be overwritten using the header custom .local file.

  • Fix: enrichers errors handling reported a generic message with no further details.

  • Fix: HTTP 404 error handling for “Entity not found” error from PeeringDB.

  • Fix: OpenBGPD, large prefix lists were causing a “string too long” error.

  • Fix: OpenBGPD, clients descriptions longer than 31 characters were not properly truncated.


  • New feature: RTT-based communities to control propagation of routes on the basis of peers round trip time.
  • Improvement: in conjunction with the “tag” reject policy, the rejected_route_announced_by BGP community can be used to track the ASN of the client that announced an invalid route to the server.
  • Fix: when the “tag” reject policy is used, verify that the reject_cause BGP community is also set.


  • Fix: default user configuration path not working.


  • New feature: reject policy configuration option, to control how invalid routes must be treated: immediately discarded or kept for troubleshooting purposes, analysis or statistic reporting.
  • New tool: invalid routes reporter.
  • Fix: the following networks have been removed from the bogons.yml file:,,


  • New feature: custom BGP communities can be configured on a client-by-client basis to tag routes entering the route server (for example, for informative purposes).

  • Fix: validation of BGP communities configuration for OpenBGPD.

    Error is given if a peer-AS-specific BGP community overlaps with another community, even if the last part of the latter is a private/reserved ASN.

  • Improvement: the custom !include <filepath> statement can be used now in YAML configuration files to include other files.

    More details here.

  • Improvement: IRRDB-based filters can be configured to allow more specific prefixes (allow_longer_prefixes option).


  • OpenBGPD 6.1 support: enable large BGP communities support.

  • Improvement: the clients-from-peeringdb command now uses the IX-F database to show a list of IXP and their PeeringDB ID.

  • Improvement: enable NEXT_HOP rewriting for IPv6 blackhole filtering requests on OpenBGPD after OpenBSD 6.1 fixup.

    Related: issue #3.

  • Improvement: BIRD, client-level .local file.

  • Improvement: next-hop checks, the authorized_addresses option allows to authorize IP addresses of non-client routers for NEXT_HOP attribute of routes received from a client.


  • Fix: avoid the use of standard communities in the range 65535:x.

  • Improvement: option to set max-prefix restart timer for OpenBGPD.

  • Deleted feature: tagging of routes à la RPKI-Light has been removed.

    • The reject_invalid flag, that previously was on general scope only, now can be set on a client-by-client basis.
    • The roa_valid, roa_invalid, and roa_unknown communities no longer exist.

    Related: issue #4 on GitHub

    This breaks backward compatibility.

  • New feature: BIRD hooks to add site-specific custom implementations.

  • Improvement: BIRD local files.

    This breaks backward compatibility: previously, *.local, *.local4 and *.local6 files that were found in the same directory where the BIRD configuration was stored were automatically included. Now, only the header([4|6]).local and footer([4|6]).local files are included, depending on the values passed to the --use-local-files command line argument.

  • Improvement: setup command and program’s configuration file.

    The default path of the cache directory (cache_dir option) has changed: it was /var/lib/arouteserver and now it is cache, that is a directory which is relative to the cfg_dir option (by default, the directory where the program’s configuration file is stored).


  • OpenBGPD support (some limitations apply).
  • Add MD5 password support on clients configuration.
  • The build command used to generate route server configurations has been removed in favor of BGP-speaker-specific sub-commands: bird and openbgpd.


  • New --test-only flag for builder commands.

  • New --clients-from-euroix command to build the clients.yml file on the basis of records from an Euro-IX member list JSON file.

    This also allows the integration with IXP-Manager.

  • New BGP communities: add NO_EXPORT and/or NO_ADVERTISE to any client or to specific peers.

  • New option (set by default) to automatically add the NO_EXPORT community to blackhole filtering announcements.


  • setup-templates command to just sync local templates with those distributed within a new release.

  • Multithreading support for tasks that acquire data from external sources (IRRDB info, PeeringDB max-prefix).

    Can be set using the threads option in the arouteserver.yml configuration file.

  • New template-context command, useful to dump the list of context variables and data that can be used inside a template.

  • New empty AS-SETs handling: if an AS-SET is empty, no errors are given but only a warning is logged and the configuration building process goes on.

    Any client with IRRDB enforcing enabled and whose AS-SET is empty will have its routes rejected by the route server.


  • Fix local files usage among IPv4/IPv6 processes.

    Before of this release, only .local files were included into the route server configuration, for both the IPv4 and IPv6 configurations. After this, .local files continue to be used for both the address families but .local4 and .local6 files can also be used to include IP version specific options, depending on the IP version used to build the configuration. Details here.

To upgrade:

# pull from GitHub master branch or use pip:
pip install --upgrade arouteserver

# install the new template files into local system
arouteserver setup


  • Add local static files into the route server’s configuration.


  • First beta version.


  • The filtering.rpsl section of general and clients configuration files has been renamed into filtering.irrdb.
  • The command line argument --template-dir has been renamed into --templates-dir.
  • New options in the program’s configuration file: bgpq3_host and bgpq3_sources, used to set bgpq3 -h and -S arguments when gathering info from IRRDBs.


  • New command to build textual representations of configurations: html.


  • New command to initialize a custom live test scenario: init-scenario.


  • New feature: selective path prepending via BGP communities.
  • The control_communities general option has been removed: it was redundant.


  • Improved communities configuration and handling.
  • Fix issue on standard communities matching against 32-bit ASNs.
  • Fix issue on IPv6 prefix validation.


  • New feature: RPKI-based filtering/tagging.


  • New feature: transit-free ASNs filtering.
  • Program command line: subcommands + clients-from-peeringdb.
  • More logging and some warning.


  • Fix issue with GTSM default value.
  • Add default route to bogons.
  • Better as-sets handling and cache handling.
  • Config syntax change: clients ‘as’ -> ‘asn’.
  • AS-SETs at AS-level.
  • Live tests: path hiding mitigation scenario.
  • Improvements in templates.


  • Fix some cache issues.


  • Packaging.
  • System setup via arouteserver --setup.


First push on GitHub.

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