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)

Configure Microsoft NLB in multicast mode using the GUI

Updated: April 17, 2026

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Configures Microsoft NLB to flood traffic on specific ports within the bridge domain using the GUI. This procedure enables static multicast mode for the cluster.

This task configures Microsoft NLB to flood only on certain ports in the bridge domain.

Before you begin

Have the following information available before proceeding with these procedures:

  • Microsoft NLB cluster VIP

  • Microsoft NLB cluster MAC address

Procedure

  1. In the Navigation pane, choose Tenant > tenant_name > Application Profiles > application_profile_name > Application EPGs > application_EPG_name > Subnets .

  2. Right-click Subnets and select Create EPG Subnet .

  3. In the Create EPG Subnet dialog box, fill in the following fields:

    1. In the Default Gateway IP field, enter the Microsoft NLB cluster VIP.

      For example, 192.0.2.1/32 .

    2. In the Scope area, for shared services, check Shared between VRFs .

      Uncheck Private to VRF , if it is selected.

    3. Under Subnet Control , check the No Default SVI Gateway check box.
    4. In the Type Behind Subnet area, click MSNLB .

      The Mode field appears.

    5. From the Mode drop-down list, choose NLB in static multicast mode .

      The MAC Address field appears.

    6. In the MAC Address field, enter the Microsoft NLB cluster MAC address.

      For the Microsoft NLB cluster MAC address for the multicast mode, the cluster MAC address has to start with 03 .

      For example, 03:BF:01:02:03:04 .

    7. Copy the Microsoft NLB cluster MAC address that you entered in this field for the multicast mode.

  4. Click Submit .

  5. In the Navigation pane, choose Tenant tenant_name > Application Profiles > application_profile_name > Application EPGs > application_EPG_name > Static Ports > static_port .

    Choose the static port that you want to configure Microsoft NLB to flood onto in the bridge domain.

  6. On the Static Path page for this port, fill in the following field:

    1. In the NLB Static Group area, click + (Create), then paste the MAC address that you copied from 3.g into the Mac Address field.
    2. Click Update underneath the Mac Address field.

  7. In the Static Path page, click Submit .

    Any traffic to this Microsoft NLB cluster MAC address will now go out on this static port.