[c-nsp] Random BGP Drops

[Mark Tinka]

On 24/Jul/15 14:48, Catalin Dominte wrote:
> Hi Mark, 
>
> Thanks for getting back to me. 
>
> This affects only a handful of customers and a handful of LINX peers.
> They have always been stable, not had any issues with them. 
>
> As far as I know they have not changed much in terms of hardware, but
> in software configuration they could have changed stuff. I can control
> what advertisements I receive from a customer and BGP policies, but I
> don't have a lot of visibility into what the customers are doing
> during their normal day to day operations. 
>
> Besides it would be too much of a coincidence if say 5 peering
> sessions get disconnected at random times, but all of them every time.

We've had issues like this across LINX peering sessions, where it turns
out to be an MTU issue.

We have a standard TCP MSS of 1,500 bytes. We've generally solved this
by having the peer fix their MTU or MSS accordingly.

I've always found it strange especially if the peer is physically
terminated on the LINX switch, and not coming in via a remote partner.
But fixing the MTU/MSS always works.

Mark.