Avoiding routes being tagged as 'unreachable' when building a route-server / lg

[Paul S.]

Madhuri,

Thank you for replying.

However, *all* of the routes are unreachable (because this is a IBGP 
multihop session and it doesn't sit on the traffic path), none of the 
core routers are sitting nexthop from this vm where I installed bird.


On 26/7/2015 2:23 AM, Madhuri wrote:
> Hi Paul,
>
> Sorry I misread your email.
> instead of "import all" try with the following filter(on router where 
> u see these unreachable routes) to avoid unreachable routes.
>
> import filter {
>                 if dest = RTD_UNREACHABLE then {
>                         reject;
>                 }
>                 else
>                         accept;
> };
>
>
> Thanks,
> Madhuri
>
> On Sat, Jul 25, 2015 at 6:49 PM, Madhuri <maduri111 at gmail.com 
> <mailto:maduri111 at gmail.com>> wrote:
>
>     Hi,
>
>     Try to configure "next hop self" for rr clients in route reflector
>     config.
>
>
>
>
>     Thanks,
>     Madhuri
>
>     On Sat, Jul 25, 2015 at 5:19 PM, Paul S. <contact at winterei.se
>     <mailto:contact at winterei.se>> wrote:
>
>         Hi guys,
>
>         New BIRD user here, I'm trying to use bird to build a looking
>         glass / route collector.
>
>         All my core routers (I don't have a backbone network, so they
>         run separately) are forwarding the full table by treating the
>         bird system as a rr client. So far, this part of it works fine.
>
>         The sessions are IBGP (and multihop by nature). My problem is
>         the fact that bird classifies the routes as unreachable (as
>         they indeed are, but I don't intend to use them to forward)
>         and mentions this in the birdc lookups.
>
>         A sample is given at the bottom, as well as the very simple
>         config that I'm using right now (No tables, but I intend to
>         set up tables per peer ('location') later)
>
>         My question is how should I deal with this issue?
>
>         bird> show route 8.8.8.0/24 <http://8.8.8.0/24> all
>         8.8.8.0/24 <http://8.8.8.0/24> unreachable [dfw_cr_0 07:39:20
>         from 10.1.13.1] * (100/-) [AS15169i]
>                 Type: BGP unicast univ
>                 BGP.origin: IGP
>                 BGP.as_path: 3491 15169
>                 BGP.next_hop: 63.218.23.65
>                 BGP.local_pref: 400
>                 BGP.community: (3491,2000) (3491,2001) (3491,15169)
>                            unreachable [syd_ocr_0 07:40:16 from
>         10.2.1.217] (100/-) [AS15169i]
>                 Type: BGP unicast univ
>                 BGP.origin: IGP
>                 BGP.as_path: 15169
>                 BGP.next_hop: 103.26.68.56
>                 BGP.med: 0
>                 BGP.local_pref: 106
>                 BGP.community: (58941,0)
>                            unreachable [lax_ocr_0 07:39:26 from
>         10.3.14.1] (100/-) [AS15169i]
>                 Type: BGP unicast univ
>                 BGP.origin: IGP
>                 BGP.as_path: 15169
>                 BGP.next_hop: 206.72.210.41
>                 BGP.med: 0
>                 BGP.local_pref: 108
>                 BGP.community: (19996,19996)
>                            unreachable [jfk_ocr_0 07:39:21 from
>         10.4.15.1] (100/-) [AS15169i]
>                 Type: BGP unicast univ
>                 BGP.origin: IGP
>                 BGP.as_path: 174 15169
>                 BGP.next_hop: 38.104.75.221
>                 BGP.med: 10040
>                 BGP.local_pref: 100
>                 BGP.community: (174,21000) (174,22013)
>
>
>         Current config, the macros have been removed for obvious reasons.
>
>>         log "/var/log/bird.log" all;
>>
>>         router id r_id;
>>
>>
>>         protocol device { }
>>
>>         template bgp peers {
>>                local as myas;
>>                multihop;
>>                import all;
>>                export none;
>>         }
>>
>>         protocol bgp syd_ocr_0 from peers
>>         {
>>             description "Sydney Open Core 0";
>>             neighbor syd_ocr_0_ip as peeras;
>>             password syd_ocr_0_password;
>>         }
>>
>>         protocol bgp lax_ocr_0 from peers
>>         {
>>             description "Los Angeles Open Core 0";
>>             neighbor lax_ocr_0_ip as peeras;
>>             password lax_ocr_0_password;
>>         }
>>
>>         protocol bgp jfk_ocr_0 from peers
>>         {
>>             description "New York Open Core 0";
>>             neighbor jfk_ocr_0_ip as peeras;
>>             password jfk_ocr_0_password;
>>         }
>>
>>         protocol bgp dfw_ocr_0 from peers
>>         {
>>             description "Dallas Open Core 0";
>>             neighbor dfw_ocr_0_ip as peeras;
>>             password dfw_ocr_0_password;
>>         }
>
>
>

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