Is there a way to merge communities from the same prefixes?

[Valery Lutoshkin]

Hello Maria,

>
>> On Mon, 6 Jun 2022 at 13:20, Valery Lutoshkin <vpluto at gmail.com
>> <mailto:vpluto at gmail.com>> wrote:
>> > For example:
>> > peer 1: 1.1.1.1/32 <http://1.1.1.1/32> 1:100
>> > peer 2: 1.1.1.1/32 <http://1.1.1.1/32> 2:200
>> > peer 3: 1.1.1.1/32 <http://1.1.1.1/32> 3:300
>> >
>> > If the last one was chosen, the result is 1.1.1.1/32 <http://1.1.1.1/32>
3:300
>> >
>> > If there is any way to collect all communities and attach them to the
chosen prefix (like this: 1.1.1.1/32 <http://1.1.1.1/32>
1:100,2:200,3:300), would anyone please
>> tell me how to do that?
>>
>> What is your use case for this "somewhat odd" request?
>>
>
> In some cases my users want to use the prefixes from one or two sources
> only. So they use route-maps to filter by community.
> In my example, if the user wanted to get the prefixes from the peer 1
> and filtered to accept 1:100 only, he loses the prefix 1.1.1.1/32
> <http://1.1.1.1/32>.

What about the BGP AddPath feature which allows for sending more than
one route for the same prefix?

That’s a great idea, thank you.

I think in my case there is an issue - the users should support RFC7911 for
this feature and most of them (mikrotik ROS6) don't.
So it looks like the only way to fix this is to change the design of the
project.
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