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Posted by3 years ago
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Kind of a long post! Hoping for some assistance with Windows NLB and changing my NICs on ESXi hosts. I know the answer is get rid of Windows NLB but that isn't currently an option.
I've messed with this for a bit and I'm not just quite getting things to work as expected. This is sort of a networking/systems crossover but figure I'd toss it out here.
We run ADFS with WAP to authenticate our users both externally and internally to various services including 365, GAPPs and a few other things. They are both in a Windows NLB (I know I know.. hardware load balancer is hopefully in next budget year).
Two nodes per cluster, each node on a different ESXi host. Windows NLB is in Multicast mode. I know this requires static ARP entries. CURRENTLY we have 1gb/s NICs in the hosts, and everything works fine with static ARP on the router as follows.
Arp 10.100.0.111 abcd.efgh.ijkl arpa - IP and MAC of ADFS cluster
Arp 10.100.0.222 mnop.qrst.uvwx arpa - IP and MAC of WAP cluster
With this setup there are no static MAC address entries, but everything works. From my understanding the MAC address entries reduce/prevent flooding.
Symptom: Microsoft NLB traffic in multicast mode is punted to the CPU and may be subject to CoPP. Conditions: - Nexus 3000 - Microsoft NLB multicast mode. For this, the Nexus has the following configured: mac address-table static 03bf.xxxx.xxxx vlan interface interface Vlan ip arp 03bf.xxxx.xxxx. Nexus, NLB, Static MAC Issues I am working on a migration of server chassis from 6500 10 gig ports to Nexus. Of course, we're using Microsoft NLB in IGMP multicast mode. NLB is not supported in max-host system routing mode. NLB multicast mode is not supported on Cisco Nexus 9500 or 9300 Series switches. Note: To work around the situation of Unicast NLB limitation, we can statically hard code the ARP and MAC address pointing to the correct interface. This document describes the configuration that must be enabled on the server in order to ensure Unicast Microsoft Network Load Balancing (NLB) mode operates correctly on Nexus 9000 Series switches. Multicast mode NLB is not supported on this platform when the device is responsible for routing traffic into the NLB cluster VLAN. Static ARP Entries for Microsoft NLB Multicast. Microsoft NLB uses a multicast MAC address, and switches aren't able learn the MAC address of the NLB IP, because the NLB never initiates traffic from the multicast MAC address, response traffic comes direct from the server. Cisco support features which allows you to nail down a MAC address.
Now, If I just move our new 10gb/s NICs up to the top of NIC teaming and put the 1gb/s NICs down into unused, it stops working. I can't access these clusters. Everything else works fine, all the VMs and storage and such, just the clusters stop functioning.
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So I decided to add in the following static MAC address entries, not sure why the old Network Admin didn't put them in.
Mac address-table static abcd.efgh.ijkl arpa vlan 200 interface po20
Digitech Nexus Windows 10
Mac address-table static mnop.qrst.uvwx vlan 200 interface po20
Where po20 is the port channel consisting of 4 interfaces that connects to the Nexus switches giving my ESXi hosts their network connections and vlan 200 is the VLAN this traffic would be on.
Regardless, the clusters still do not work. I have made sure nothing is getting assigned new MAC addresses, they all stay the same. I've double checked all my commands, MACs, IPs.
Everything I read just says that Windows NLB in Multicast needs the static ARP entries. I do understand why it needs these and it makes sense. I'm just not getting the disconnect that is happening when I swap over to the new NICs.
Any thoughts? I'd be glad to provide any information requested.
Windows Nlb Unicast Vs Multicast
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October 2019
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