Community for small IX - problem with 4B ASN

[Piotr Marciniak]

Dear Advisors ;],

Thank you for all posts. But still I do not know how to make Bird working 
with 4B communities and if I may do this - whether it will be accepted for 
our peers? In short - I do not know how to adapt to 4B communities following 
examples:

https://gitlab.labs.nic.cz/labs/bird/wikis/Route_server_with_community_based_filtering_and_multiple_RIBs
https://gitlab.labs.nic.cz/labs/bird/wikis/Route_server_with_community_based_filtering_and_single_RIB

Is there any way to enable 4B communities in bird.conf?

I do not have any problem with 4B ASn. I set bgp peering sessions from Bird 
with 4B ASn. Even our IX has AS205082.

This is why I put 2 questions:

1. Is it possible to enable 4B ASn for communities in Bird? Will it work
with other rouers?
2. Can we use instead private ASn just for community filters? Are they
processed corretly by other Internet routers of our peers?

Please - do not explain me theoretical difference between 16 and 32 bits. 
Question is simple - can I use 4B communities for filters? If not - what 
16bit "fake ASn" I can use instead safely?

Best wishes,

Piotr Marciniak


-----Oryginalna wiadomość----- 
From: Paweł Nastachowski
Sent: Monday, January 22, 2018 1:12 PM
To: Piotr Marciniak
Cc: bird-users at network.cz
Subject: Re: Community for small IX - problem with 4B ASN

Hi Piotr,

I should use extended community for 4B ASN, because normal community is too 
small “Encodes a 32-bit value displayed as “16-bit ASN:16-bit value”.

Regards,
Pawel

-----Wiadomość oryginalna-----
Od: Bird-users <bird-users-bounces at network.cz> w imieniu użytkownika Piotr 
Marciniak <zboj at mnc.pl>
Data: poniedziałek, 22 stycznia 2018 11:15
Do: "bird-users at network.cz" <bird-users at network.cz>
Temat: Community for small IX - problem with 4B ASN

    Hello,

    I've spent a while on below docs and faced a problem with 4B ASN we use.
    Bird reports an error 'when 'myas' is 4B => so above 65535.
    See some testing example below:

    bird> configure
    Reading configuration from /etc/bird/bird.conf
    /etc/bird/bird.conf, line 81: Value 165250 out of range (0-65535)

    The only way this config reports no error is to set here private ASn - 
fe.
    65250. But it will never match our real ASn.

    Two questions:

    1. Is it possible to enable 4B ASn for communities in Bird? Will it work
    with other rouers?
    2. Can we use instead private ASn just for community filters? Are they
    processed corretly by other Internet routers of our peers?

    Or maybe there is another work around?

    Best wishes,

    Peter


    -----Oryginalna wiadomość-----
    From: Piotr Marciniak
    Sent: Friday, December 29, 2017 5:01 PM
    To: Ondrej Zajicek
    Cc: bird-users at network.cz
    Subject: Re: Community for small IX


    There are some examples in BIRD wiki, mainly:

    https://urldefense.proofpoint.com/v2/url?u=https-3A__gitlab.labs.nic.cz_labs_bird_wikis_Route-5Fserver-5Fwith-5Fcommunity-5Fbased-5Ffiltering-5Fand-5Fmultiple-5FRIBs&d=DwIDaQ&c=gxW9PgscCAGwFImBgfkGkoANogu61GVPNv0sglxAtik&r=5Q01PsGCLGh5Iipn2_EFz2pKmXKRl5oJ_tHzyrwTUhrj4D27CXd9SGXgnGWoH5Yy&m=b6e1rT2mu_bWkZiOT-71FnOGwrXSx-xnpaRwbI3-BFI&s=2UgZOD_Fkqt6ZgVqlXm_vXRiY1LP_MTlkWo-TGVqAtE&e=
    https://urldefense.proofpoint.com/v2/url?u=https-3A__gitlab.labs.nic.cz_labs_bird_wikis_Route-5Fserver-5Fwith-5Fcommunity-5Fbased-5Ffiltering-5Fand-5Fsingle-5FRIB&d=DwIDaQ&c=gxW9PgscCAGwFImBgfkGkoANogu61GVPNv0sglxAtik&r=5Q01PsGCLGh5Iipn2_EFz2pKmXKRl5oJ_tHzyrwTUhrj4D27CXd9SGXgnGWoH5Yy&m=b6e1rT2mu_bWkZiOT-71FnOGwrXSx-xnpaRwbI3-BFI&s=KjVYea-iJRNl8BxFQFgkEeHLWFK8qwenAm_GRJDH4Q4&e=

    --
    Elen sila lumenn' omentielvo

    Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
    OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
    "To err is human -- to blame it on a computer is even more so."



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