Receiving via ibgp route community blackhole and then advertise to upstreams using community blackhole.

Hi @Popeye_Wang

Thanks for your answer.

Answering your question
I don't quite understand what you mean by blackhole. Do you mean the no-advertise community?

For example, when i receive a ddos attack, i advertise to my upstreams the ip address attacked with community blackhole(community  666) then my upstreams filter the ip address, stopping the attack. Consequentely anybody on internet can't communicate  with this ip address.

i did the following

route-policy upstreamA_export permit node 10
if-match community-filter 1
apply community 65000:666 additive

ip community-filter 1 permit myasn:666

When i did this, i look bgp routing table peer ip-my-upstream advertised-routes 192.168.0.0

it display
Community:<myasn:666>, <65000:666>

Is it possible remove my internal community from my advertise?

This parameter additive is used to adding community attributes. If you do not need the original attributes, remove this parameter.