Question of multicast and Microsoft NLB

Hello

I just set up our first server of Microsoft using multicast NLB cluster.

The entry door of the VLAN is a 5540 Cisco and servers are connected on a pile of Cisco 3750.

In order to let the ASA before executives for this multicast group I put static arp resolution in this cluster's multicast MAC address.

No static MAC entry on our switches.

All work purposes and multicast works but...

(1) using the wireshark on our NLB nodes I found that frames are intended for machine unicast mac address. IF I ping from the ASA to the Cluster IP, ICMP is sent just for ALL NLB nodes.

(2) all images are nodes NBL has the MAC address (physical) of unicast.

(2) other hosts in the same VLAN do not receive all the emissions associated with this group (multicast works)

(3) on our Cisco 3750 stack, multicast MAC address is not in the cam.

Since only the NLB nodes receive this traffic, my question is:

HOW the multicast can work only if the switch doesn't know anything about this group?

Thank you

Paolo

Paolo,

I really thought that you were using the IGMP option because of your statement:

"(2) other hosts in the same VLAN do not receive all the emissions associated with this group (multicast works).

Without the IGMP option, NETWORK load balancing uses a locally administered multicast MAC address with the format 03:BF:. Thus, this isn't an IANA-assingend (01-00-5E) multicast MAC address, IGMP Snooping can avoid flooding of these frameworks throughout the entire VLAN, which is the only way a switch can manage these frameworks. The recommendation to avoid/container this flood is the configuration of the static entries from MAC because the MAC of Cluster multicast (linking exclusively for the required ports). These static entries then also appear in the output of "show the mac address table.

With the option IGMP, you can make use of the IGMP snooping to prevent flooding, so the static MAC entries are not required in this case and cluster multicast THAT MAC can be dynamically learned by IGMP snooping. It should then be listed in the output of 'show mac address-table multicast '.

HTH

Rolf

Tags: Cisco Network

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