Issues running BMP protocol in v3.0.1

[admin at nxthdr.dev]

Hey, I took a another look at this issue, using the same BMP configuration as the previous email (enabling pre and post policy), and receiving two prefixes (1 v4 and 1 v6) via BGP from a peer.

With BIRD 2.16, I get the following sequence from my BMP collector:

- BMP Initialisation message
- Peer Up Notification message
- Two "empty" Route Monitoring messages (no announced or withdrawn prefixes)
- Two "empty" Route Monitoring messages (noannouncedor withdrawn prefixes) with afi IPv6
- Two Route Monitoring messages (pre and post policy) with the v4 prefix announced
- Two Route Monitoring messages (pre and post policy) with the v6 prefix announced

With BIRD 3.0.0 and above (tested with all the 3.x.x versions), I get the following sequence:

- BMP Initialisation message
- Peer Up Notification message
- Two "empty" Route Monitoring messages (no announced or withdrawn prefixes)
- Two "empty" Route Monitoring messages (noannouncedor withdrawn prefixes) with afi IPv6

So long story short, on BIRD version 3, I don't receive any BMP Route Monitoring messages, besides the empty ones at the beginning of the BMP session (not sure about why they are here tbh, but that's not a v3 particularity).

Best,
Matthieu.
On Monday, 31 March 2025 at 23:11, admin--- via Bird-users <bird-users at network.cz> wrote:

> Hey,
>
> I've migrated from 2.16.1 to 3.0.1 and I'm facing some issues with the BMP protocol.
> The TCP session goes up but I don't receive all peers up notifications. I receive some (but not all it seems) when I restart bird after have started my BMP collector. If I do the opposite, I get none.
>
> Also, I don't receive route monitoring messages. To be precise, I receive only one route monitoring message when I receive a peer up notification. But this one is empty (meaning no announced/withdrawn prefixes in it). Also I receive it just just before the peer up, which is a bit weird. I should receive a tons of them, with announced prefixes in it, right after the peer up.
>
> Here is my BMP configuration:
>
> protocol bmp {
> station address ip 2a06:de00:50:cafe:100::c port 4000;
> monitoring rib in pre_policy;
> monitoring rib in post_policy;}
>
> bird> show protocols all bmp1
> Name Proto Table State Since Info
> bmp1 BMP --- up 18:08:26.528 Established
> Created: 18:08:16.105
> Station address: 2a06:de00:50:cafe:100::c
> Station port: 4000
> Pending TX: 0 B (limit 1024.0 MB)
> Session TX: 789 B Total TX: 789 B
>
> Do you experience the same behavior?
>
> Please let me know if you need more information, I'm happy to make some other tests if needed.
>
> Best,Matthieu.
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