The customer is looking for redundant interconnection of the existing network to the new ACI fabric. Unicast and multicast traffic must be routed between the two networks. Which L3Out implementation meets these requirements?
I agree with you:
PIMv4/PIM6 is supported on Layer 3 Out routed interfaces and routed subinterfaces including Layer 3 port-channel interfaces. In the 5.2(2) release and earlier, PIMv4/PIM6 is not supported on Layer 3 Out SVI interfaces. In the 5.2(3) release and later, PIMv4/PIM6 is supported on Layer 3 Out SVI interfaces
https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/5x/l3-configuration/cisco-apic-layer-3-networking-configuration-guide-52x/ip-multicast-layer3-config-52x.html#id_21570
Cisco ACI does not support multicast on Routed Subinterfaces or Layer 3 Port (Routed Physical Interfaces). Multicast traffic requires PIM, which is only supported on SVI-based L3Outs. Routed subinterfaces and direct routed interfaces do not support PIM in ACI.
Only routed interface and subinterface allow multicast
upvoted 2 times
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