Re: using BIRD as route reflector - add paths option not working?

15 Dec 2021

      On Wed, Dec 15, 2021 at 04:34:39PM -0500, mike@routerpro.ca wrote:
...
Hello,
I am using bird as a RR and have set the add paths tx; option, however I am
still only seeing best path being advertised.
Hello

That is strange, it should work.
...
3 routes present , with one marked as BEST:
bird> show route x.x.x.x/32
Table master4:
x.x.x.x/32    unreachable [RR_Client_IPv4_03  2021-12-15 21:05:36 from
y.y.y.y] * (100) [AS4200001111?]
                     unreachable [RR_Client_IPv4_05  2021-12-15 21:05:35
from y.y.y.x] (100) [AS4200001111?]
                     unreachable [RR_Client_IPv4_01  2021-12-15 21:05:16
from y.y.y.z] (100) [AS4200000110?]
===
1 BEST route advertised to RR client:
bird> show route export RR_Client_IPv4_01 x.x.x.x/32
Table master4:
x.x.x.x/32    unreachable [RR_Client_IPv4_03  2021-12-15 21:05:36 from
y.y.y.y] (100) [AS4200001111?]
Is this expected behavior even with add paths enabled? I was expecting all 3
routes to be advertised to RR client.
Works for me (3 RR clients, one route is not exported,
because it is from the same neighbor that is examined):

bird> show route table master4
Table master4:
10.10.0.0/16         unicast [ibgp4_1 23:04:40.917] * (100) [i]
    via 10.0.1.2 on ve1
                     unicast [ibgp4_2 23:04:37.585] (100) [i]
    via 10.0.1.3 on ve1
                     unicast [ibgp4_3 23:04:37.374] (100) [i]
    via 10.0.1.4 on ve1

bird> show route export ibgp4_1
Table master4:
10.10.0.0/16         unicast [ibgp4_2 23:04:37.585] (100) [i]
    via 10.0.1.3 on ve1
                     unicast [ibgp4_3 23:04:37.374] (100) [i]
    via 10.0.1.4 on ve1

bird> show route export ibgp4_2
Table master4:
10.10.0.0/16         unicast [ibgp4_1 23:04:40.917] * (100) [i]
    via 10.0.1.2 on ve1
                     unicast [ibgp4_3 23:04:37.374] (100) [i]
    via 10.0.1.4 on ve1

bird> show route export ibgp4_3
Table master4:
10.10.0.0/16         unicast [ibgp4_1 23:04:40.917] * (100) [i]
    via 10.0.1.2 on ve1
                     unicast [ibgp4_2 23:04:37.585] (100) [i]
    via 10.0.1.3 on ve1

bird> show protocols all ibgp4_1

    Local capabilities
      Multiprotocol
        AF announced: ipv4
      ...
      ADD-PATH
        RX:
        TX: ipv4
      ...
    Neighbor capabilities
      Multiprotocol
        AF announced: ipv4
      ...
      ADD-PATH
        RX: ipv4
        TX:
      ...

Simple static setup:

Route reflector:

template bgp ibgp4 {
        ipv4 {
                import all;
                export where source ~ [ RTS_STATIC, RTS_BGP ];
                add paths tx;
        };
        rr client;
}

protocol bgp ibgp4_1 from ibgp4 {
        local 10.0.1.1 as 1;
        neighbor 10.0.1.2 as 1;
}

protocol bgp ibgp4_2 from ibgp4 {
        local 10.0.1.1 as 1;
        neighbor 10.0.1.3 as 1;
}

protocol bgp ibgp4_3 from ibgp4 {
        local 10.0.1.1 as 1;
        neighbor 10.0.1.4 as 1;
}

Client:

template bgp ibgp4 {
        ipv4 {
                import all;
                export where source ~ [ RTS_STATIC, RTS_BGP ];
                add paths rx;
        };
}

protocol bgp ibgp4_1 from ibgp4 {
        local 10.0.1.2 as 1;
        neighbor 10.0.1.1 as 1;
}

-- 
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago@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."

Re: using BIRD as route reflector - add paths option not working?

Ondrej Zajicek