The following notes explain clearly what you need to do to get this properly configured based on your network infrastructure vendor. For further information contact Cisco mentioning this bug. If you find out that your vendor is not listed here please let us know by a comment so we can try to add it. We are not going to take much care about different models, since usually same vendor share same logic for configuration, but we want you to have at least an idea of how it should look like.
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If you need assistance for any specific model, please contact your manufacturer. In case you have any doubts on the content of the above-mentioned notes please contact the respective manufacturer for support or assistance.
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Finally, to cover the Virtualization part, you may be wondering how would you configure the static MAC Address table for a Virtual Machine. Well, we need to understand first how the Virtual Infrastructure is composed. Usually, in enterprises, you have a cluster of a bunch of servers acting as hypervisors Hyper-V, VMWare, etc. Here comes another complain from the Networking team.
This way you can do Live Migration or vMotion in case of VMWare without worrying to which host the virtual machine will get into. Finally, we have the last mode for NLB: This mode is completely dependent on your network infrastructure, since you need to have IGMP capable switches to get it to work. In our example of the screenshot, for the IP Yes, because your switch should be capable of snoop the traffic to find the ports which are sending the IGMP traffic to auto configure their MAC Address table accurately and send the traffic to the corresponding ports.
Some of the notes listed above in the Multicast section have the correct configuration parameters for their devices, but in case you need confirmation your equipment is capable of this mode, please contact your Hardware vendor for confirmation.
So far, we have reached the end of the blog today, so I hope you enjoyed the explanation and, of course, hope this helps you get your NLB back on track! We'll miss you in the team Daniel!! You must be logged in to post a comment. Unicast Unicast is the easier way to configure the NLB. Multicast This mode is my preferred one. As summary: Unicast mode is the easiest way to configure NLB in simple environments. The bandwidth is efficiently used and you have a low risk of performance issues as collateral damage for other systems.
Option 1A: Option 2: Option 2A: The different methods are just different ways to limit layer 2 multicast flooding. Good solutions. Do you know how to work it around on Nv virtual switch on ESX host server? Any good suggestion? We were able to enter Mac static address after upgrading our 7k to new version. NLB traffic from servers arre passing through ok since then. Hope this helps.
First, the layer-2 multicast lookup command just determines whether to use layer 3 or layer 2 to generate the TCAM lookup key. In this case, we have a unicast ip address using a multicast mac address. So we want to use layer 2 as the lookup key since layer 3 is not a multicast IP address. For mac flapping, it means the switch is learning i. Do you need to use layer 2 for the lookup?
The second command for the static group essentially tells the router to put multicast packets with the defined multicast mac address since it is mac based lookup, it translates the multicast ip address to a mac address out that interface. If we don't change the mutlicast lookup mode to mac, and don't config ip igmp snooping static-group, the packet with destination mac: If we don't change the mutlicast lookup mode to mac, and config ip igmp snooping static-group, the packet with destination mac: We have to change the mutlicast lookup mode to mac, and config ip igmp snooping static-group, the packet with destination mac: We have to separate what the switch has to do for packets to reach For packets coming into the switch, a mac address will flap if the switch sees this source mac address coming in on 2 different ports.
Solved: Multicast and Microsoft NLB question - Cisco Community
Typically a server with 2 NICs plugged into the same switch will be misconfigured to send packets using the same source mac address on both NICs. This will cause the switch to update its mac address table with each new packet on each port coming from the server. The configuration we discussed does nothing for mac flapping on 2 different ports. MLB does not use this to transmit packets only to receive them. For packets trying to reach the destination IP address This bridges Layer 3 IP header to Layer 2 ethernet header and allows a hardware forwarding entry to be created. That's what the static ARP entry is for since it will not learn a multicast mac address with a unicast ip address dynamically.
For the most part, what we are trying to do is limit the nasty habit of flooding multicast packets out all ports. I have this problem too. Accepted Solutions. Rolf Fischer. Paolo,I really thought you. Hi Paolo,3 on our Cisco What do you think should be the correct configuration in our scenario? Dear Rolf,The strange.
Dear Rolf, The strange behaviour is that frames sent to nodes in the cluster has the physical mac address in the destination field and not the If you have to suggest the best practice, what is your opinion? With or without IGMP? What about the configuration? Consider that we have the following setup: Hi Paolo,that's really.
Catalyst Switches for Microsoft Network Load Balancing Configuration Example
Hi Paolo, that's really strange. In this case, What about my second question? HTH Rolf. Thanks Satya. Hi Satya,NLB unicast mode. Hi Satya, NLB unicast mode works differently. Walter Astori. In my environment i have some. On the switch i configured the static mac address with the instruction: Please suggest.
Latest Contents. Created by Edgar c Francis on Distribution listsA distribution-list is used to control routing update either coming to your router or leaving from the router.
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It is used for implementing policy that causes the packet to take a different direction. Policy based routing allows source based routing.