January 2011 - Bird-users

how to confirm which capabilities have been negotiated
by Eiichiro Watanabe 24 Oct '11

24 Oct '11

Hello, Do we have an appropriate command to show which BGP capabilities have been negotiated on bird after a peer has been established? Of course, I known I can recognize when I look into packets captured, or confirm it on the neighbor router by using "show ip bgp neighbor x.x.x.x" command (in the case of CiscoIOS). it wouldn't be smart. Thanks, eiichiro -- ################################################### Eiichiro Watanabe Internet Multifeed Co.

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BIRD at MSK-IX
by Mikhail A. Grishin 27 May '11

27 May '11

Hi, We successfully finished the process of adaptation BIRD to MSK-IX network. Currently BIRD is running on both IPv4 Route Servers (version 1.2.0 with some patches from Ondrej Zajicek). Also we modified our public Looking Glass service. It's available via: http://www.msk-ix.ru/eng/lookingglass.html Thank you for help and cooperation! -- Mikhail A. Grishin E-mail: magr(a)ripn.net

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Check on routes announced by peer
by Simone Morandini 14 Feb '11

14 Feb '11

Hi all, a (hopefully) quick question: one of our peer says it is announcing a set of network to the route server, but there routes do not actually appear to be there... If I issue a "sh route protocol <PEER>" the list is empty, as well as if I issue "sh route where bgp_path.first=<peer-as>". Is there a way to check if those network actually arrive to the route server? Thanks, Simone. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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BGP sessions resetting on configure
by Stephen Holmes 30 Jan '11

30 Jan '11

Is there a preferred way to reload the configuration? I noticed sometimes when we 'configure soft' it will reset the bgp sessions. Is this the normal behavior? Is there another method? Thanks, Stephen Holmes

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bird route selection problem
by Daniel Rimal 28 Jan '11

28 Jan '11

Hello, i have little weird problem with route selection in bird. A have four routers in my AS, routers called R1 and R2 is running guagga, routers called R3 and R4 is running bird 1.2.5. I have configured full mesh between all of them. IP 81.xxx.yyy.189 and 81.xxx.yyy.190 is ebgp peers. Both, R3 and R4 running bird have established peer with both ebgp routers. IP 109.xxx.yyy.11 and 109.xxx.yyy.12 is IP on R3 respectively R4 (ibgp interconnection) After receive this withdraw from ebgp peer 81.xxx.yyy.189 by R3 for example: 14:19:23.930683 81.xxx.yyy.189 81.x.yyy.185 BGP UPDATE Message Withdrawn prefix: 187.120.96.0 (187.120.96.0) bird do this: - switch route between ebgp and ibgp peer very fast - 288 times (in one second) in this case: 14:19:25 <TRACE> kernel1 < replaced 187.120.96.0/23 via 81.xxx.yyy.190 on bond0.402 14:19:25 <TRACE> kernel1 < replaced 187.120.96.0/23 via 109.xxx.yyy.12 on bond0.403 14:19:25 <TRACE> kernel1 < replaced 187.120.96.0/23 via 81.xxx.yyy.190 on bond0.402 which generates a lot of withdraw/updates messages between all routers in my AS (288 times in this case): 14:19:26.018478 109.xxx.yyy.11 109.xxx.yyy.12 BGP UPDATE Message Withdrawn prefix: 187.120.96.0 (187.120.96.0) 14:19:26.018567 109.xxx.yyy.12 109.xxx.yyy.11 BGP UPDATE Message Withdrawn prefix: 187.120.96.0 (187.120.96.0) 14:19:26.018643 109.xxx.yyy.11 109.xxx.yyy.12 BGP UPDATE Message NLRI prefix: 187.120.96.0 (187.120.96.0) 14:19:26.018766 109.xxx.yyy.12 109.xxx.yyy.11 BGP UPDATE Message NLRI prefix: 187.120.96.0 (187.120.96.0) If i undestant correctly, ebgp peer .189 withdraw this route, but route is still available via ebgp peer .190 and via ibgp peer and it looks bird don't know which path use. This is one concrete case, but i think, bird have this behaviour with almost of all bgp updates, which i can see in debug log. Thanks for any help. Dan Rimal

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Required capability missing
by Simone Morandini 26 Jan '11

26 Jan '11

Hi all, I've just configured a new peer on our IPv6 implementation of BIRD and, as per the subject, I'm receiving the following error with "sh protocols": <peer name> BGP T_<peer name> start 18:05 Idle

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Import/Export filter per peer...looking for suggestions
by Stephen Holmes 24 Jan '11

24 Jan '11

Hi all, We have a few bird configurations we are attempting to throw into production, but there is one thing I cannot figure out entirely. We would like to offer our participants the option to exclude in/outbound to other participants at their choosing. I have a basic setup that filters based on the 'from' ip address of the interface, but this posses a problem. Since I am using a master table this method could potentially reject a network that could have been offered through a non-preferred route (unless that is not the case?). As is the filter function simply looks like this: function bgp_out_ASXXXX(int peeras) { if ! (source = RTS_BGP ) then return false; if (0,peeras) ~ bgp_community then return false; if (myas,peeras) ~ bgp_community then return true; if (0, myas) ~ bgp_community then return false; if from = x.x.x.x then { return false; } return true; } Any suggestions? Thanks, Stephen Holmes

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Question about filters
by Marek Wajdzik 18 Jan '11

18 Jan '11

Hi. I have a small problem with the configuration shown in the diagram below BGP_Peer1 ---\ BGP_Peer2 ----> --- My_BGP_Router ---- BGP_Peer5 BGP_Peer3 ---/ BGP_Peer4 --/

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BIRDs allowas-in functionality
by Bartek Kois 18 Jan '11

18 Jan '11

Hi I`ve got two networks in different locations without any connection between them. In each of them I`ve got two BGP routers connected to two separate ISP`s. Both networks have the same AS number but their BGP routers propagate different prefixes (different /23 prefix for each network). The thing is that hosts inside one network don`t see hosts in the second network, because of BGP anti-loop mechanism. Typically this problem can be solved by using "allowas-in" directive. How to achieve the same functionality in BIRD configuration? Thanks for any help. Best regards Bartek

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Looking glass for bird
by Denis Samsonov 14 Jan '11

14 Jan '11

who uses the looking glass for bird? I can not find a ready solution: ( who can share their interface or show where to download? PS. Thanks in advance. My English is very bad, sorry

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