Troubleshooting invalid path configuration on Cisco ACI

Abstract

One of the most common error while connecting devices to a Cisco ACI fabric is related to an invalid path configuration.

The full error is:

Fault delegate: Configuration failed for uni/tn-TenantName/ap-AppName/epg-EpgName node 101 PC_to_Switch1 due to Invalid Path Configuration, debug message: invalid-path: vlan-200 :There is no domain, associated with both EPG and Port, that has required VLAN;

In other words, there is a mismaatch/misconfiguration between the tenant view and the fabric view regarding VLAN, physical ports or physical domain:

  1. Starts from Tenant -> <tenant name> -> Application Profiles -> <application profile name> -> Application EPGs -> <EPG name> -> Static Ports and check if all ports, facing the external switches, are defined here, and be sure the VLAN is correct.
  2. Go to Tenant -> <tenant name> -> Application Profiles -> <application profile name> -> Application EPGs -> <EPG name> -> Domains and check that the right physical domain is defined here.
  3. Go to Fabric -> Access Policies -> Physical and External Domains -> Physical Domain -> <domain name found in #2> and check that the VLAN defined in #2 is included in a VLAN pool.
  4. Go to Fabric -> Access Policies -> Switch Policies -> Profiles -> Leaf Profiles -> <leaf profile name> and check that all required leafs and interface profiles are associated.
  5. Go to Fabric -> Access Policies -> Interface Policies -> Profiles -> Leaf Profiles -> <interface profiles found in #4> and check that the correct interfaces are associated to each interface profile, and check which policy groups are associated.
  6. Go to Fabric -> Access Policies -> Interface Profiles -> Policy Groups -> Leaf Policy Groups -> <policy groups found in #5> and check that AAEP matches.
  7. Go to Fabric -> Access Policies -> Global Policies -> Attachable Access Entity Profiles -> <AAEP name found in #6> and check that includes the physical domain found in #2.

References

Posted on 21 Mar 2018 by Andrea.
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