BGP filter

RouterOS Forwarding Protocols
1

I have a router bgp and 2 providers (A and B).
From one (A) I get a full routing table, from the second (B) only 40 000 prefixes.

I have a client that wants me to buy only these 40 000 prefixes get from neighbor B.
How to write a filter to capture only the prefixes from the neighbor (B) and send only those prefixes to the customer.


MK

2

You can do it with BGP communities. Set BGP community for those 40k prefixes. And advertise to the client only those prefixes which has community set.

3

so i try:

/routing filter
add action=passthrough chain=Neighbour_B-in disabled=no invert-match=no
set-bgp-communities=111:111
add action=passthrough bgp-communities=111:111 chain=Client1-out disabled=no
invert-match=no


but it is only my improvisation

MK

4

Can I expect to have any “step by step” ?

MK