Checking Wiring and UUID
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Leaf switches provide infra connectivity between each APIC by detecting APICs via LLDP. This step checks wiring issues between
a leaf and an APIC that is detected during LLDP discovery.
Any issues in here implies a leaf switch cannot provide infra connectivity for an APIC as it doesn’t have a valid information.
For example, APIC UUID mismatch means the new APIC2 has a different UUID than the previously known APIC2.
UUID – Universally Unique ID, or chassis ID in some outputs
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Checking AD Processes
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APIC clustering is handled by the Appliance Director process on each APIC. This step checks if the process is running correctly.
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Checking All Apics in Commission State
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To complete the APIC clustering, all APICs need to be commissioned.
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Checking All Apics in Active State
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To complete the APIC clustering, all commissioned APICs need to be active. If it is not active, the APIC may not be up yet.
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Checking Fabric Nodes: Inactive switches
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The APIC's communication are through infra connectivity provided by leaf and spine switches. This step checks inactive switches
to ensure switches are providing infra connectivity.
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Checking Apic Fully-Fit
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When APICs have established IP reachability to each other through infra network, it will synchronize its database to each
other. When the synchronization completes, the status of all APICs become Fully-Fit. Otherwise, the status will be Data Layer
Partially Diverged, and so on.
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Checking Shard Convergence
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When APICs are not fully-fit, database shards need to be checked to see which service is not fully synchronized. If there
is any service that has problems in synchronization, you may reach out to Cisco TAC for further troubleshooting.
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Checking Leadership Degration
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In ACI, each database shard has one leader shard distributed to each APIC in the cluster. This step shows if all shards have
an optimal leader. If there is an issue in here when all APICs are up, you may reach out to Cisco TAC for further troubleshooting.
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Ping OOB IPs
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This step is to check if all APICs are up and operational by pinging the OOB IP which is configured separately from clustering.
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Ping Infra IPs
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This step is to check if there is infra connectivity between each APIC. APIC clustering is performed through infra connectivity
instead of OOB.
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Checking APIC Versions
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All APICs should be on a same version to complete clustering.
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Checking SSL
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All APICs need to have a valid SSL that should be built-in when an APIC is shopped as an appliance. Without a valid SSL, the
server cannot operate APIC OS correctly.
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