Re: Arista “IP-SLA” / Active Probing

[Tom Beecher <beecher () beecher cc>]

> I did some research on this and it seems like perhaps the on-boot event
> handler launching a python daemon to do this active probing out each isp
> circuit and then making config changes in response to transit failures
> might be the best option available to us.

Pretty much, yes. They don't have any functionality like IP-SLA in EOS, but
you can roll your own.

Ex:

https://github.com/arista-eosext/PingCheck



On Wed, Dec 20, 2023 at 1:44 PM Alex Buie <abuie () cytracom com> wrote:

> Hello all,
>
> We find ourselves trying to solve a requirement where we would like to
> test the viability of our paths to the internet and tear down the bgp
> session if it is determined to be faulty. We had an issue recently where we
> did not lose link or bgp but the carrier lost the ability to route traffic
> to the internet for us and our existing automatic detection and remediation
> strategies failed to detect this condition and we lost customer packets.
>
> Conceptually, we have a pair of DCS7050-QX landing a fiber each from two
> ISPs with default routes on BGP at a dozen POPs around the US.
>
> One of the ISPs is our primary transit, and one is predominantly for
> peered customers, but we can use it for transit during issues with the
> primary circuits.
>
> I did some research on this and it seems like perhaps the on-boot event
> handler launching a python daemon to do this active probing out each isp
> circuit and then making config changes in response to transit failures
> might be the best option available to us.
>
> However, I thought I’d reach out to the broader community to see if
> there’s a better way to solve this, has an example script, or if anyone has
> recommendations for methods of active monitoring for protecting against
> this sort of failure.
>
> Thanks in advance for any insight and time.
>
>
>
>
> *Alex Buie*Senior Cloud Operations Engineer
>
> 450 Century Pkwy # 100 Allen, TX 75013
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