[AusNOG] How to setup something like LACP across two switches

[Simon Attwell]

James,

I glanced through the responses so this might have been covered in one of
the many links you were provided.
It seems to me that simple spanning-tree would solve your problem if you
don't mind being limited to 1Gbps.
Supported on pretty much every switching platform in different flavours
(STP, RSTP, MST, PVST, RPVST+).

Spanning tree was developed to prevent switching loops.
You can have two links to the customer switch from your two independent
switches if they are interconnected.
You can control link selection with bridge priority.
Failover in the case of a switch or link failure would be automatic.
Spanning-tree will block one link until a failure occurs to prevent traffic
from looping.

Regards

- Simon




--
Simon Attwell
Mobile: 0409 756 819
Email: simon at attwell.net

On 20 April 2018 at 09:45, Jarryd Sullivan <Jarryd.Sullivan at area9.com.au>
wrote:

> Hey James,
>
> Looks like you've already gotten a heap of responses, but if you're also
> using HPE (flex network/comware) switches you can use IRF:
> http://h17007.www1.hpe.com/docs/reports/irf.pdf
>
> Another vendor, another name/technology :)
>
> Jarryd Sullivan
>
>
> From: AusNOG <ausnog-bounces at lists.ausnog.net> On Behalf Of James
> Cunningham
> Sent: Friday, 20 April 2018 8:48 AM
> To: ausnog at lists.ausnog.net
> Subject: [AusNOG] How to setup something like LACP across two switches
>
> Hello Fellow Ausnoggers,
>
> I'm hoping that I can quickly pick the brain of someone more knowledgeable
> in data centre networking than myself.
>
> We have a customer in one of our racks in Equinix who has a single network
> switch, and some servers connected to it. We currently have two connections
> from our switch to the customer's switch, with LACP for redundancy (and as
> a side effect, we get a slight bandwidth boost for 2 x 1Gbps connections,
> which is a slight bonus).
>
> We would like to improve this by putting in two network switches on our
> end, to protect again a single switch failure on our side, but the customer
> will still have one single network switch.
>
> I'm pretty sure we can't do LACP with this style of setup - so what would
> people recommend to achieve redundancy here? Main thing is that the
> connection needs to auto-failover if a network switch fails, or if one of
> the uplinks fails.
>
> I have created the attached diagram which illustrates what we are trying
> to do.
>
> Can anyone please help? I'll owe a beer at the Next AusNOG meetup!
>
> Thanks
>
> James
>
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