[dev] How to pass gateways ip dynamically in BGP connection with multihop

[Xiaodong Xu]

I can't think of any other way if you don't want to either add static
routes on Node 1, or run OSPF between Node 1 and Node X worker nodes. It
sounds to me you are trying to balance traffic between the worker nodes. If
that's the case you might need a load balancer behind Node 1.
I'd suggest you share some background of your setup so that people can
understand the intention and find alternatives for you.

On Fri, Feb 18, 2022 at 9:48 PM SANDEEP KUMAR <sandeepkumar2016000 at gmail.com>
wrote:

> With OSPF connection between Node1(FRR) and Node X route learn
> automatically but we don't want to run OSPF between Node1 and NodeX and
> here following is requirement
>
>
> Node 1(FRR)ß---------à Node X ß-------------à Node 3(FRR)
>
>
>
> Node X consists of Node X-master and Node X1-worker1, Node X-worker2, Node
> X-worker3,...,Node X-workerN. Node X-master knows all details of the
> workers. *Can we have BGP connection only between Node 1 and Node
> X-master and feed next hop details about workers to Node 1 over this BGP
> connection ? *We want to avoid running OSPF/BGP between workers and Node1.
>
>
>
>
>
> Node 1(FRR) ß---------à Node X-masterß-------------à Node 3(FRR)
>
>          ß---------à Node X-worker1 ß-------------à Node 3(FRR)
>
>          ß---------à Node X-worker2 ß-------------à Node 3(FRR)
>
>          ß---------à Node X-worker3 ß-------------à Node 3(FRR)
>
>                   .
>
>                                  .
>
>                                  .
>
>         ß---------à Node X-workerN ß-------------à Node 3(FRR)
>
>
>
> Thanks & Regards,
> Sandeep Kumar
>
> On Thu, Feb 17, 2022 at 11:23 PM Xiaodong Xu <stid.smth at gmail.com> wrote:
>
>> Hi Sandeep,
>>
>> I assume you are talking about the gateway IP like 192.168.12.2 which is
>> configured on Node X. If you don't want to add these routes manually you
>> may run OSPF between Node 1 and each Node X, so that Node 1 may learn from
>> Node X automatically.
>>
>> Please be aware that each Node X will need to know how to route to Node 3
>> as well. The case could be similar, but since Node X is connected to Node 3
>> directly, you don't have to do anything, unless bgp on Node 3 is running on
>> the loopback interface.
>>
>> Regards,
>> Xiaodong
>>
>> On Thu, Feb 17, 2022 at 5:50 AM SANDEEP KUMAR <
>> sandeepkumar2016000 at gmail.com> wrote:
>>
>>> Hi All,
>>>
>>>
>>>
>>> We have a 3 node setup where
>>>
>>>
>>>
>>>    Node 1(FRR)ß---------à Node X ß-------------à Node 3(FRR)
>>>
>>>
>>>
>>> So as per the setup FRR is running on Node 1 and Node 3 , and there is
>>> an intermediated node NodeX (say Node 2) between them, If we want to
>>> establish a BGP connection between Node 1 and Node 3 , we have to add a
>>> static route in FRR config like below –
>>>
>>>
>>>
>>> ip route 192.168.23.3 255.255.255.255 192.168.12.2
>>> neighbor 192.168.23.3 ebgp-multihop 2
>>>
>>>
>>>
>>> Is there a way we could pass the gateway ip dynamically to Node 1 ,
>>> instead of hard-coding it in config , because for our use case this ip
>>> could be 1 or many (*many gateways for load balancing*)
>>>
>>>
>>> Thanks & Regards,
>>>
>>> Sandeep Kumar
>>> _______________________________________________
>>> dev mailing list
>>> dev at lists.frrouting.org
>>> https://lists.frrouting.org/listinfo/dev
>>>
>>
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