Some routers require a static ARP entry because they do not support the resolution of unicast IP addresses to multicast media access control addresses. For example, Cisco routers require an ARP (Address Resolution Protocol) entry for every virtual IP address. While Network Load Balancing uses Level 2 Multicast for the delivery of packets, Cisco's interpretation of the RFCs is that Multicast is for IP Multicast. So, when the router doesn't see a Multicast IP address, it does not automatically create an ARP entry, and one has to manually have to add it on the router. This paper covers general best practices, security, manageability, high availability, and troubleshooting.
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