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Nlb multicast mac address range

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The three interfaces belong to VLAN The NLB group works in multicast mode. The servers also share virtual IP address Involved Network Elements Other network elements are not required. License Support NLB is a basic feature of the device and is not under license control.

NLB Multicast / Source Mac Address - Network Engineering Stack Exchange

Procedure Run: Use the following methods to configure a multi-interface MAC address entry. Configure a multi-interface MAC address entry in the system view.

Microsoft Network Load Balancing

By default, no multi-interface MAC address entry is configured on a device. In this blog note I will try to summarize every important aspect to be considered at the deployment time, and also will share with you some third-party documentation that will help you troubleshoot the most common NLB-related problem scenarios in our support life.

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If you would like to know how NLB works, I would recommend to use the following blog note which covers almost all the basics. What is the best configuration method for NLB? As you all may know, NLB has 3 modes to be configured: The real answer for that question is: All three modes work very well if they are properly configured, but they can cause you a real headache if they are not.

From a NLB standpoint, the configuration is straightforward: You have also some tools to prepare yourself for each method, basically on the MAC Addressing of each of them. This tool is available on any machine with NLB installed, and is very easy to be used. The command is as follows: As noted in the screenshot, we can get the MAC Address for each mode easily with this command. You can do your math also, considering the following: Now the problem comes when you choose a NLB method but your network infrastructures is not prepared for that.

Unicast is the easier way to configure the NLB. In some cases, you would like to have 2 NICs on your server.

Multicast - Convert IP to MAC address

If you are running Windows or higher you should consider this other blog note to ensure the traffic gets routed properly with this configuration. Each NLB Heartbeat packet contains about bytes of data only the heartbeats! By default, the nodes send heartbeat packets each second and wait for 5 of those packets to be received until it considers the node as converged.


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You need to increase that number by the number of nodes you have in place. Pretty much data huh? Now imagine what would happen if you have a 24 or 48 ports Switch in which you have only 2 NLB nodes connected.


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What a mess, right? To avoid this, you have 2 options: First is to get a HUB.

EOS: How to configure multicast mac to stop flooding of NLB server traffic via slow path

Since static entries are performed in hardware and directed to specific ports, performance is increased by removing unnecessary flooding to all group ports. If there are switches in the layer 2 path between the users and the server cluster then the mac must be configured on all uplinks that egress towards the server. When unicast as multicast is enabled on the device, a lookup is performed to determine if the unicast address has also been configured for multicast on the device.

If a multicast address is found, packets are hardware forwarded out the configured VLAN and port s as defined in the static multicast configuration by extending the search phase of the Layer 2 lookup to match an unlearned destination MAC address against static multicast MAC entries. The unicast as multicast feature is configured by: Use the set mac multicast command to specify the MAC address to be treated as a multicast address, specifying the VLAN and egress port s to use.

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