Thus this is not an IANA-assingend multicast MAC address (01-00-5E), IGMP snopping cannot avoid the flooding of those frames throughout the entire VLAN, which is the only way a switch can handle such frames. Without the IGMP option, NLB uses a locally administered Multicast MAC address with the format 03:BF. "2) Other hosts in the same VLAN do not receive any broadcast related to this cluster (multicast is working)" HOW can the multicast work if the switch doesn't know anything regarding this cluster?! Since just NLB nodes are receiving this traffic, my question is: IF I ping from the ASA to the Cluster IP, the ICMP is sent just to ALL the NLB nodes.Ģ) All frames originated from the NBL nodes has the unicast (physical) MAC address.Ģ) Other hosts in the same VLAN do not receive any broadcast related to this cluster (multicast is working)ģ) on our Cisco 3750 stack, the Multicast MAC address is not in the CAM. In order to let the ASA forward the frames for this multicast group I had to set the static arp resolution to the Multicast MAC address of this cluster.Īll works fine and multicast is working but.ġ) Using wireshark on our NLB nodes I found that frames are destinated to the unicast mac address of the machine. The gateway of the VLAN is a Cisco 5540 and the servers are connected on a Cisco 3750 stack. I just configured our first cluster of Microsoft servers using Multicast NLB.
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