MPLS L3VPN using bird

[Ondrej Zajicek]

On Thu, Sep 15, 2022 at 08:08:09PM +0000, Jose Miguel Bentue wrote:
> Hello,
> 
> The goal is to gain communication from a linux based host to another PE-CE by using MPLS L3VPN.
> 
> To your question:
> 
>   *   "configure the PE functionality, connecting to other PE via BGP with MPLS (AFI 1 / SAFI 128) + mpls-labeled packets"
> 
> Yes, I understand that's first step and it is done by using "vpn4 mpls" channel, am I right?
> Once the BGP session is established, I see the routes in bird's vpn4 table.

Hello

As Maria wrote, this part is not implemented. Our BGP L3VPN (1/128) code
can be used as a route reflector for other PEs, but not as PE itself.

Coincidently, i just finished improved MPLS support for BIRD [*], which
supports full LSP routing with BGP-based label distribution, and i am
currently working on L3VPN code for PE, it should be usable next week.

Note that even this code is limited to BGP label distribution for MPLS
backbone (no LDP support).

[*] https://gitlab.nic.cz/labs/bird/-/commits/mpls


> ________________________________
> From: Bird-users on behalf of Maria Matejka
> Sent: Thursday, September 15, 2022 8:07 PM
> To: bird-users at network.cz
> Subject: Re: MPLS L3VPN using bird
> 
> Hello!
> 
> This part of MPLS is not implemented for now. Yet to clarify this, you
> want to configure the PE functionality, connecting to other PE via BGP
> with MPLS (AFI 1 / SAFI 128) + mpls-labeled packets and also to CE via
> BGP AFI 1 / SAFI 1 (unicast) + normal IP packets?
> 
> Thanks
> Maria
> 
> 
> On 9/15/22 19:33, Jose Miguel Bentue wrote:
> > Hello,
> >
> > I'm trying to establish MPLS L3VPN between bird and another router.
> >
> > CE1 -- PE1 --- MPLS VPN --- PE2 -- CE2
> >
> > Can anybody help me with a configuration example?
> >
> > I have set the configuration at the end of the mail and can see bird
> > establish the BGP session and get routes in alt_ipv4_table. But I don't
> > see the traffic is being routed according to that table.
> >
> > Thanks in advance and Best Regards
> >
> > ===========================================
> > vpn4 table alt_ipv4_table;
> >
> > log syslog all;
> >
> > router id 10.7.3.106;
> >
> > protocol device {
> >          scan time 10;
> > }
> >
> > protocol kernel {
> >          learn;
> >          persist;
> >          scan time 2;
> >          ipv4 {
> >                  import all;
> >                  export all;
> >          };
> >          graceful restart;
> >          merge paths on;
> > }
> >
> > protocol bgp uplink1 {
> >          description "My BGP uplink";
> >          local 10.7.3.106 as 64516;
> >          neighbor 10.7.3.180 as 64513;
> >          ipv4 {
> >                  import filter {reject;};
> >                  export filter {accept;};
> >          };
> >          vpn4 mpls {
> >                  table alt_ipv4_table;
> >                  import all;
> >                  export none;
> >          };
> >          multihop;
> >          graceful restart;
> >          connect delay time 2;
> >          connect retry time 5;
> >          error wait time 5,30;
> > }
> > ============================================
> >
> >
> > --------------------------------------------------
> >
> > *José Miguel Bentué*
> >
> > Support Engineer


-- 
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."