[pve-devel] [PATCH] controllers: bgp: enable multihop on the underlay

[alexandre derumier]

Hi,

any impact to enable it by default ?

if user have only 1 peer for example ?

maybe is is better to only enable it if we have more than 1 peer in the 
group ?

and check that we use ebgp.

something like:

push @controller_config, "neighbor BGP ebgp-multihop 3" if $ebgp && scalar @peers > 1;


On 09/04/2021 14:21, Alexandre Bruyelles wrote:
> From: Alexandre Bruyelles <git at jack.fr.eu.org>
>
> Multihop is required when the bgpd are running across
> a pair of MLAG routers.
> In such scenario, TCP trafic from Proxmox to router A
> may pass through router B, which will decrease the TTL.
>
> Signed-off-by: Alexandre Bruyelles <git at jack.fr.eu.org>
> ---
>   PVE/Network/SDN/Controllers/BgpPlugin.pm | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/PVE/Network/SDN/Controllers/BgpPlugin.pm b/PVE/Network/SDN/Controllers/BgpPlugin.pm
> index e5d8490..69436a0 100644
> --- a/PVE/Network/SDN/Controllers/BgpPlugin.pm
> +++ b/PVE/Network/SDN/Controllers/BgpPlugin.pm
> @@ -85,6 +85,7 @@ sub generate_controller_config {
>   	push @controller_config, "neighbor BGP peer-group";
>   	push @controller_config, "neighbor BGP remote-as $remoteas";
>   	push @controller_config, "neighbor BGP bfd";
> +	push @controller_config, "neighbor BGP ebgp-multihop 3";
>       }
>   
>       # BGP peers