I've found some KB pages on Juniper's site talking about multicast NLB but. SRX240 and Windows NLB. Static ARP entries for the multicast NLB IP.

They will stay the same: ' Network Load Balancing provides a second mode for distributing incoming network traffic to all cluster hosts. Called multicast mode, this mode assigns a layer two multicast address to the cluster adapter instead of changing the adapter's station address. The multicast MAC address is set to 03-BF-1-2-3-4 for a cluster's primary IP address of 1.2.3.4.

Since each cluster host retains a unique station address, this mode alleviates the need for a second network adapter for communication between cluster hosts, and it also removes any performance penalty from the use of dedicated IP addresses.' REF: This post is provided AS IS with no warranties or guarantees, and confers no rights. ~~~ Questo post non fornisce garanzie e non conferisce diritti. In my understanding IGMP is used just to mitigate swtich flooding, it doesn't provide HA features. NLB is just for LB, you should plan for HA at network level.

I found something here: 'Q. How Do I Remove the Switch as a Single Point-of-Failure? Create a subnet that spans two switches and connect half of the NLB cluster nodes to each switch. In this case, if one switch fails, you only lose half of your nodes from participating in the NLB. Alternatively, you can have other failover arrangements on your core switch.'

This post is provided AS IS with no warranties or guarantees, and confers no rights. ~~~ Questo post non fornisce garanzie e non conferisce diritti. ' This problem can be overcome by adding a static ARP entry to the router for each virtual IP address, and the cluster's multicast MAC address can be obtained from the Network Load Balancing Properties dialog box or from the Wlbs.exe remote control program.' The static entries can be created for the multicast address, and that means you didn't bother to read the article I sent. Please mark it as answer if this helped you. This post is provided AS IS with no warranties or guarantees, and confers no rights. ~~~ Questo post non fornisce garanzie e non conferisce diritti.

Hi, I configured windows NLB in multicast mode and gave the MAC to network team for adding a static ARP entry in switches, i am wondering whether this MAC id is dynamic or it will stay the same untill i change the mode, or should i go for IGMP mode When you configure NLB, whether it in 'Unicast', 'Multicast' or 'IGMP Multicast', the MAC Address is always static. But, the MAC Address for each mode is different. So if you change from Multicast to IGMP Multicast, the first MAC Address part 01: will change to 03: To provide you with some information: Unicast: As you know this is a non switch assisted load balacning mechanism. It will cause switch-flooding because it result in one to all (broadcast) traffic. Multicast: Keep in mind. If you configure NLB in Multicast mode.

You have to configure a static ARP entry on each L3 switch/router in that subnet. This will map the Multcast MAC address to a Unicast IP Address.

But, it still results in one to all (broadcast). Unless you configure static assignment to specific ports. You have to map the Multicast MAC Address to each port statically, to have one-to-many traffic. IGMP Multicast: This is the best method available. If setup correctly it work perfectly!

To make is work you also need a static ARP entry like with Multicast. But switches will automatically and dynamically detect (using IGMP Snooping) on which switch ports the NLB members are connected. Resulting in a one-to-many traffic. Even when you physical machines or virtual machines move between switch ports.

NOTE: IGMP Multicast is very easy to setup with a single or stacked swtich. Buku Psikologi Perkembangan Hurlock Pdf Converter more. When you interconnected multiple switches in the same subnet (with switch uplinks) thing get difficult, because then you need something called a IGMP Querier. Which for this post is quit another story. Boudewijn Plomp ITON Consultancy Please remember, if you see a post that helped you please click 'Vote as Helpful', and if it answered your question, please click 'Mark as Answer'. Brute Force Login Tool Download here. This posting is provided 'AS IS' with no warranties, and confers no rights.