This can be enabled by going to Fabric > Access Policies > Global Policies > MCP Instance Policy default.MCP (per Vlan) should be enabled – MisCabling Protocol (or MCP) detects loops from external sources (i.e., misbehaving servers, external networking equipment running STP) and will err-disable the interface on which ACI receives its own packet.
We will keep this document updated as new versions come out, so don’t forget to bookmark this page! Wherever possible, we will include the Cisco documentation for the links, or at the very least, a detailed explanation of our reasoning.
The top question all new ACI customers have (or should have), is what are the configurations that should be enabled on my fabric from the beginning? With that in mind, we’re going use this post as a living document with configurations that are considered “Best Practice” to have enabled.
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