I am trying to configure etherchannel on 3750E switch for link redundancy. We are having 2 stacked 3750E switch connected to Nexus 2148 switch via trunk port which is further connected to Nexus 5010.
I am using 3750E as core switches. I want redundancy on 3750E so that in case one of the stack member fails, other member can pass the traffic. The problem is when I configuring lacp to acheive this I am getting %SW_MATM-4-MACFLAP_NOTIF: MAC flapping errors, which I belive due to looping.
Below is the typical layout
3750E ------------ 3750E (Stacking)
NX 2148 NX 2148
NX 5010 -------- NX 5010 (VPC)
Could somebody suggest any solution to overcome this issue or any other method through which I can acheive the redundancy between switches?
Think of the etherchannels like ethernet cable. If you would have there a triangle let's say from one C3750 two connection to 2 NX switches and also connection between NXes. This will create loop? No, because we have something magic called Spanning-Tree
It's the same here. You have to be careful when configuring the etherchannels to have the same settings and check STP to be proper configured and you're out of loops.
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