Re: Sites unreachable while traversing Dallas IXP

[Bruce Wainer via NANOG <nanog () lists nanog org>]

Excuse my ignorance about this IXP and your equipment, but is
Micro-BFD (RFC 7130) supported? And if so, is it enabled or can you
enable it? While configuration wise it will use the single IP
addresses of the aggregate, separate BFD instances are set up for each
underlying link and will confirm whether Layer 3 is working on that
point-to-point connection.
Bruce Wainer

On Thu, Sep 25, 2025 at 11:22 PM Andy Cole via NANOG
<nanog () lists nanog org> wrote:
> Group,
>   I've been Peering with both Route Servers in the Dallas IX for over a
> month using a single 10G link with no issues. Due to capacity concerns I
> had to augment to a 20G LAG. In order to do this, I shut the existing link
> down (which dropped both eBGP sessions), used the existing IP space to
> create the LAG, and then added the 2nd 10G link. The eBGP sessions
> reestablished over the LAG and traffic started flowing error free. No
> configuration changes to routing policy at all.  After a few days we
> started to get customer complaints for certain sites/domains being
> unreachable. I worked around the issue by not announcing the customer
> blocks to the route servers and changed the return path to traverse
> transit. This solved the issue, but I'm perplexed as to what could've
> caused the issue, and where to look to resolve it.  If you guys could
> provide feedback and point me in the right direction I'd appreciate it. TIA.
>
> ~Andy
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