Re: Sites unreachable while traversing Dallas IXP

[Brian Turnbow via NANOG <nanog () lists nanog org>]

Hi Andy,

 Andy Cole via NANOG wrote on 26/09/2025 04:21:
> 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.

Besides what others have mentioned,
Another thing that changed moving from the physical interface to lacp
is going to be the mac used on the ixp lan.
I would check connectivity to all IPs on the peering lan as they may
receive your routes from the route server but not be able to contact
you directly.
You may have already done this but as you mentioned removing the
announcements to the route server, to solve the issue it rang the
route server blackhole bell for me.
It wouldn't be the first time I've seen this happen.

Brian


Brian
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