If you cannot ping across your IX, you need to look lower than BIRD to figure out the problem.

I would try to answer questions like: Is ARP resolving IPs to MACs? Is the problem isolated to a single BIRD server only? Is it only IPv4 problem only, or IPv6 as well?

If you can answer some of these questions, you'll get closer to finding the root cause, I expect.

Cheers,

Jonathan

On Thu, Aug 3, 2017 at 2:25 AM, Ajai Kumar <joinajay1@gmail.com> wrote:

Dear All,

We are facing problem with few peers in our IX. Frequently they get Hold Timer Expired Error and they are not able to ping our route server IP. After shut no shut this problem resolves for sometime. One log message appended

bgp_hold_timeout:4690: NOTIFICATION sent to X.X.X.X (External AS 132953): code 4 (Hold Timer Expired Error), Reason: holdtime expired for X.X.X.X (External AS 132953), socket buffer sndcc: 57 rcvcc: 0 TCP state: 4, snd_una: 728368567 snd_nxt: 728368624 snd_wnd: 15744 rcv_nxt: 429172199 rcv_adv: 429188583, hold timer out 90s, hold timer remain 0s

Requesting for help pls.
Regards,
Ajai Kumar
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Jonathan