Hi, there everyone.
I'm curious if anyone can add a little value to a couple of questions i've got while doing a current implementation of UCS. Both of these issues really are layer three issues that should be handled by a layer three switch upstream, but really I have nothing else to try. Both of the things i'm trying to do work fine on siwtches and servers connected to standard Catalyst switches in this customers environment, but they don't work on UCS.
First, I"m trying to use host based NLB on systems hosted on the UCS B series servers. These servers use unicast and multicase NLB and typically in a cisco environment, to make these forms of NLB work, you simply have to create a static ARP entry on the layer three switch upstream. This works fine for servers and VM's on standard servers and Catalyst switches. However, in this case, no matter what I do, the static arp entry on the layer 3 switch upstream from the 6120 doesn't seem to be working. Is anyone aware of a way to add or modify the CAM/ARP table on the Nexus 6120 for UCS B systems?
On that same line, I have VM's that are built on a Cisco UCS blade server that's running VMware ESX4. These VM's are going to be setup to use DHCP. However, none of the VM's in any VLAN are getting their DHCP addresses? Typically this is handled by putting the DHCP relay information on the layer 3 switch upstream, but we've done this and it still doesn't work. Has anyone experienced this and if so, how did you fix it? I've verified that if I set one of these VM's up with a static IP in the same VLAN that should have DHCP, the VM can ping it's default gateway which is an interface on the same layer 3 switch hosting the dhcp relay information. It really seems like the DHCP request is never making it to the layer 3 switch. Anyone seen anything like this? Again, I'd like to try and add dhcp relay information to the Nexus 6120, but I can't seem to figure out any way to do this.
Again, both of these things are pretty standard easy to do things that work just fine on standard hosts and VM's living in the standard server and catalyst world, not sure why they won't work on UCS, but it's frustrating.
Thanks in advance.