EAPS and oneway traffic

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Question around oneway traffic patterns in a ring design 


Say I have a ring of 4 switches  interconnected with WDM equipment over dualfiberpairs 

Between switch 1 and 2 I loose the link, so the switch flags the port as down Local fault. 
However the WDM equipment manages to have one TX/RX active in one direction only. But the switch acts as if the ring is down and opens the secondary port on the master. 

In this scenario traffic would still arrive at the masters secondary port but just one-way. 

My question around this. Would this cause a loop ? 
Switch 1 would still receive all the traffic from switch 2 but it could not send anything back since its one-way traffic only. 

Makes sense? 
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Andreas Larsen

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Posted 3 years ago

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Daniel Flouret, Employee

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Andreas,

If you are running EXOS v15.2 or higher, you can configure EAPS to use CFM to check link health.

That way, EAPS will consider the link as up only if both switches can excange CFM messages correctly.