Filters based on communities from other peer

[Przemyslaw Bromber]

Hi Everyone

I'm not sure if this is a proper group for asking about an issue I have.

I'm new to BIRD and decided to build POC where I have a bunch of servers 
(SRV1, SRV2, SRVxx) with BIRD and the same /32 prefixes on loopback 
interfaces. Those prefixes are sent to RT-MAIN. To have only one active 
server with designated IP prefix I decided to prepend the prefix on 
other servers n times. This configuration works fine. Failovers work 
perfectly but with infrastructure I have with a lot of changes I have to 
use an agent to refresh BIRD configuration files very often. To get rid 
of this problem I came with an idea to use a management routers 
connected to all servers sending the same prefixes as on my servers but 
with communities, e.g. (65000,n) where n means how many times prefix 
should be prepended on server. Topology would look like this:

NET

|

|

RT-MAIN --- SRV2

| |

||

SRV1 --- RT-MGMT

This is an idea but I have a problem with implementation. Is it possible 
with BIRD to write an export filter which will be able to use 
communities received prom other peer? For example, if SRV1 receives 
prefix 10.1.1.1/32 with community (65000,3) form RT-MGMT and this prefix 
is configured on interface lo then it should be send to RT-MAIN 
prepended three times