03-11-2012 01:24 PM - edited 03-07-2019 05:29 AM
Hello,
I need your help
I have this configuration:
Normally for example: Link from Switch A to C: Blocked by spanning tree
How to configure to use all link? To take advantage of the redundance if there are failure and also to have full speed (Ex 2 * 1 Gb) or when the link A to B is full to use also the link A to C.
I hope to be clear in my request ^^
Thansk for your help
Thepetitjean
03-11-2012 01:44 PM
Since you have a physical loop in your topology, in order to stop it you need to use STP. The other alternative is Flex Link if your devices support it. With Flex link you are still using one link as primary and one as backup.
Have a look at this link for more info:
HTH
.
03-11-2012 02:34 PM
Thanks for your answer.
STP is actif. To avoid the loop one link is desactivate by STP.
In the two case, one link don't serve.
I suppose is not possible to have this possibilities?
Thanks
03-11-2012 02:42 PM
Correct, STP will block one link to prevent loop. Now, in your example if switch B and C are 3750 series switches, you can stack them together and connect switch A to both switch B and C using an Etherchannel. In this case you utilize both links.
HTH
03-11-2012 05:27 PM
Reza,
Would it be possible to use PVRST+ rather than STP to load balance the connections and get a theoretical 2Gb connection?
Thanks,
Ed
03-12-2012 03:52 AM
Thanks for your answer.
No stack Possible
Only 2960.
03-11-2012 04:30 PM
you need to create an ether channel using link aggregation to create a 2gb link between switches.
Sent from Cisco Technical Support iPhone App
06-27-2012 08:49 PM
Jean,
What did you come up with for your configuration?
Thanks,
Ed
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