Re: interesting troubleshooting

[Steve Meuse <smeuse () mara org>]

What that large flow in a single LSP? Is this something that FAT lsp would
fix?

-Steve


On Fri, Mar 20, 2020 at 5:33 PM Nimrod Levy <nimrodl () gmail com> wrote:

> I just ran into an issue that I thought was worth sharing with the NANOG
> community. With recently increased visibility on keeping the Internet
> running smoothly, I thought that sharing this small experience could
> benefit everyone.
>
> I was contacted by my NOC to investigate a LAG that was not distributing
> traffic evenly among the members to the point where one member was
> congested while the utilization on the LAG was reasonably low. Looking at
> my netflow data, I was able to confirm that this was caused by a single
> large flow of ESP traffic. Fortunately, I was able to shift this flow to
> another path that had enough headroom available so that the flow could be
> accommodated on a single member link.
>
> With the increase in remote workers and VPN traffic that won't hash across
> multiple paths, I thought this anecdote might help someone else track down
> a problem that might not be so obvious.
>
> Please take this message in the spirit in which it was intended and
> refrain from the snarky "just upgrade you links" comments.
>
> --
> Nimrod