topic RE: Triple redundancy link in ExtremeSwitching (EXOS/Switch Engine)

Triple redundancy link

Jakub — Tue, 26 Jun 2018 17:14:00 GMT

Hi, community!I have some problem with configuration redundancy on my switch. I need to set to links as a redundancy. I have links A,B,C. A is a main link whose redundancy link is B. If A and B failed i want to that link C take whole network traffic. I don't have any idea how to do this.

Thanks for help
Best regards.

RE: Triple redundancy link

Zdeněk_Pala — Tue, 26 Jun 2018 17:48:00 GMT

Please clarify if you are referring to routing and you play with the link cost or if you want L2 and you want to play with spantree...

RE: Triple redundancy link

John_Romero — Tue, 26 Jun 2018 18:24:00 GMT

Why don't you just setup a 3 port LAG?

RE: Triple redundancy link

Zdeněk_Pala — Tue, 26 Jun 2018 18:26:00 GMT

If each link is full duplex and the same speed then agree the LAG is the best choice.

RE: Triple redundancy link

Martineau__John — Tue, 26 Jun 2018 23:58:00 GMT

Spanning tree will take care of this automatically BUT I also recommend a 3 port LAG.

RE: Triple redundancy link

Jakub — Wed, 27 Jun 2018 10:04:00 GMT

Yeah, sorry and thank you all ,it is on L2, and the network is connected with EAPS, so without STP. And yes all the links are in full duplex with the same speed. But if i make a 3 port LAG, data will be balanced equal on each port and i want to use only A(if works)
only B(if A failed) and only C(if A and B failed). Am i right ?

A(master)=>B(slave)/B(Master)=>C(slave)

RE: Triple redundancy link

Zdeněk_Pala — Wed, 27 Jun 2018 11:09:00 GMT

Yes you are right. In such case you need to use scripting to react on link A event. If link A goes down then configure EAPS to use link B and deconfigure vlans from link A. If link A goes up again then deconfigure link B and configure link A... With LAG there will not be outage. With the scripting approach there will be some shotr outage as script must execute and EAPs must be established again. But yes doable.

RE: Triple redundancy link

Jakub — Wed, 27 Jun 2018 11:18:00 GMT

Thank you all

RE: Triple redundancy link

EtherMAN — Thu, 28 Jun 2018 01:08:00 GMT

There may be other ways to do what you are trying to do ... It would help if we had a simple diagram show switches and what ABC is connected to.

RE: Triple redundancy link

Jakub — Wed, 04 Jul 2018 15:46:00 GMT

I configure it by UPM profile, but i have problem with if statment

configure upm timer "timer" after 10 every 10

enable lldp ports all

conf lldp ports 1 2 advertise all-tlvs

conf upm event device-detect profile "redundancy" ports 1 2

conf upm event device-undetect profile "redundancy" ports 1 2

create upm profile redundancy:

if (($MATCH($EVENT.NAME,DEVICE-UNDETECT))==0) then

enable port 3

else

disable port 3

endif

but this if always disable port

RE: Triple redundancy link

Brian_Anderson1 — Thu, 05 Jul 2018 19:01:00 GMT

How about this solution? https://gtacknowledge.extremenetworks.com/articles/How_To/How-to-configure-Active-Standby-port-or-LA...

RE: Triple redundancy link

Jakub — Thu, 05 Jul 2018 19:01:00 GMT

It's good for two links but you can't set third link as a redundancy to first two

RE: Triple redundancy link

Brian_Anderson1 — Thu, 05 Jul 2018 19:01:00 GMT

Ok, guess I didn't have the full picture. Probably as Etherman suggested a simple diagram would be helpful.