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An access switch is a switch that almost always only runs Layer 2 or Ethernet, it does not router packers only forwards frames. An access switch may only have end user computers attached and a connection (or multiple connections using LACP) to the core switch.You may also have servers connected to theaccess switch, but this may or may not be a good idea.n access switch may only have end user computers attached and a connection (or multiple connections using LACP) to the core switch. You may also have servers connected to theaccess switch, but this may or may not be a good idea.
The Cisco IT ACI border switch topology is a pair of leaf switches configured for connecting to networks outside the ACI fabric. Ethernet ports on an ACI leaf switch connect to upstream data center core switches. Any ACI leaf switch in the fabric can be a border leaf. Cisco IT dedicates a pair of leaf switches to this function because they are located physically closer to the upstream network than the rest of the leaf switches in the fabric.