Cisco APIC Layer 3 Networking Configuration Guide, Release 6.2(x)

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Cisco APIC Layer 3 Networking Configuration Guide, Release 6.2(x)

Verify PIM interface creation for L3Out interface

Updated: April 17, 2026

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Verify that a PIM interface is properly created for an L3Out interface by confirming PIM enablement and multicast configuration.

This task helps troubleshoot cases where a PIM interface (pim:If) is not being created for an L3Out interface as expected.

When working with L3Out interfaces, PIM interfaces should be automatically created to support multicast functionality. If this is not happening, specific configuration elements need to be verified.

Procedure

  1. Verify that PIM is enabled on the L3Out.

    If PIM is disabled, enable it.

  2. If PIM is enabled on the container L3Out, confirm that a multicast l3ext:InstP has been created with "__int_" as a prefixed name.

    This multicast l3ext:InstP is used to deploy L3Out PIM policies to the switches. There should be one multicast l3ext:InstP per L3Out.

    Note

    • If a multicast l3ext:InstP exists on the IFC, we can check whether a corresponding fv:RtdEpP is created and deployed on each switch where there is an interface in that L3Out.

    • We do not support an L3Out SVI interface for PIM.

After completing these verification steps, the PIM interface should be properly created for the L3Out interface if all configurations are correct.