Table 12: Configure Spine Switch 1, Spine Switch 2, and External Device Configuring Optimized Layer 2 Overlay Multicast Example 6: Configuring Optimized Layer 2 Overlay Multicast Interworking with External Network for IPv4 and IPv6 Spine Switch 1 Spine Switch 2 External Device Configuring Optimized Layer 2 Overlay Multicast 144