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Esxi host disconnected in Vcenter

talltree
talltree asked
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Last Modified: 2017-05-25
Hi Experts,

We are using Vcenter 6.0 with 2 esxi 6.0 hosts. Both hosts have identical hardware. Nothing recently has been added in the environment.

One host has a disconnected status and is greyed out in Vcenter. I can ping this disconnected host by IP and DNS name from all network devices except the Vencter and host can not ping each other.

I read documentation posted and checked DNS/firewall and agent communication on port 902 and it is communicating correctly and not blocked.

The only difference between the working host on VCenter and the disconnected host on Vcenter is that the disconnected host has a VLAN which in Vcenter under hosts - network the VLAN name is listed before the VM Newark and I am not sure if Vcenter is trying to use the VLAN IP to communicate with instead of the default LAN?

Both have a DAG storage device and all paths on both hosts show no errors and have active status on all links.

I have looked at the vpxa.log and do not see any error entries, but do see these 2.
 2017-04-21T19:10:48.350Z info vpxa[395A7B70] [Originator@6876 sub=VpxaHalResourcePool opID=SWI-4075edcf] GetOverrideFailureCount() = 0MAX_CONSECUTIVE_OVERRIDE_FAILURES = 3

 2017-04-21T19:17:07.335Z verbose vpxa[39523B70] [Originator@6876 sub=hostdstats] Set internal stats for VM: 3 (vpxa VM id), 20 (vpxd VM id). Is FT primary? false.

Thank you
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Andrew Hancock (VMware vExpert PRO / EE Fellow)VMware and Virtualization Consultant
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Commented:
if you click Reconnect does it reconnect ?

Author

Commented:
Hi Andrew,


No, also when I right click to connect it quickly turns grey
Andrew Hancock (VMware vExpert PRO / EE Fellow)VMware and Virtualization Consultant
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Commented:
can you ping the host by IP Address and Hostname from the vCenter Server ?

Author

Commented:
No I can not ping the host by IP or Host name from Vcenter and the same from the host back to Vcenter. I can ping the host and IP from any other computer on the network.
Andrew Hancock (VMware vExpert PRO / EE Fellow)VMware and Virtualization Consultant
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Commented:
Okay, so this is the reasons it's disconnected, no communication from vCenter Server to Host - to be expected.

so you'll need to look at the host networking and configuration.

ping from host to vCenter Server.

Author

Commented:
Host to Vcenter is not communicating. It is only the communication directly between this host and Vcenter. I can ping Vcenter and this host form any other device.

Andrew on the network configuration i look at the management network properties, use the following properties? I click on the edit properties/IP settings and it is correct the default network address assigned. Or is there an additional place to look? Is there a command in SSH to confirm?

Is it possible that VCenter is trying to communicate to this host via the 2nd VLAN on this host?

Thanks

Author

Commented:
Hi Andrew,

I used SSH esxi to remote to both hosts that are managed by Vcenter, the one that is okay and the one that is in a disconnected state.

esxcli network ip interface ipv4 get
Name  IPv4 Address  IPv4 Netmask   IPv4 Broadcast  Address Type  DHCP DNS
vmk0  10.20.1.120   255.255.255.0  10.20.1.255     STATIC           false

esxcli network ip interface ipv4 get
Name  IPv4 Address  IPv4 Netmask   IPv4 Broadcast  Address Type  DHCP DNS
vmk0  10.20.1.121   255.255.255.0  10.20.1.255     STATIC           false

Both vmk0 entries are both on the same network.

Thanks
Andrew Hancock (VMware vExpert PRO / EE Fellow)VMware and Virtualization Consultant
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Commented:
vCenter Server will communicate via it's nominated Management Network, and IP Address.

So on the host, which cannot connect, can you ping vCenter IP Address from it ?

Author

Commented:
No, I can not ping the disconnected host from Vcenter infor below
Name  IPv4 Address  IPv4 Netmask   IPv4 Broadcast  Address Type  DHCP DNS
vmk0  10.20.1.120   255.255.255.0  10.20.1.255     STATIC           false

But, can ping the 2nd host on Vcenter below, same network.

esxcli network ip interface ipv4 get
Name  IPv4 Address  IPv4 Netmask   IPv4 Broadcast  Address Type  DHCP DNS
vmk0  10.20.1.121   255.255.255.0  10.20.1.255     STATIC           false

Author

Commented:
Does Vcenter Server nominate a  management network per host?
"vCenter Server will communicate via it's nominated Management Network, and IP Address"

The disconnected host as an additional VLAN is it possible Vcenter is trying to communicate to the host on that network and not the default?
Andrew Hancock (VMware vExpert PRO / EE Fellow)VMware and Virtualization Consultant
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Commented:
vCenter Server does not, but it uses the Hostname/DNS name, and IP Address which is designated the Management Network on the Host.

Author

Commented:
Hi Andrew,

From my above posting, On the disconnected host we have an additional VLAN for our Voice.

I tried pinging this VLAN IP form the Vcenter server and it replied (VLAN 5, 10.20.101.120)
VLAN1 default network host IP 10.20.1.120 does not reply.


When i look at the IP settings of the host management network on the disconnected host the IP is form the default VLAN(0.20.1.120), so i am sure how Vcenter can ping the VLAN 5 IP not the default VLAN IP?

Thanks
Andrew Hancock (VMware vExpert PRO / EE Fellow)VMware and Virtualization Consultant
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Commented:
Have you change some host configuration after it was connected to vCenter Server?

So you've got a networking issues somewhere, as you cannot ping or connect to 10.20.1.120 on VLAN1 (and VLAN1 is a special VLAN, and should not be used!)

you could just add a Management Network interface on VLAN5 with a different IP Address on 10.20.101.x

Author

Commented:
No changes after, but I recently added this host as we are preparing to implement VMotion.

Andrew can i send pics/visual of this setup to you?

Author

Commented:
Andrew if i have the correct IP in the "Specify an IP address for the management network adapter", in the Configuration Management wouldn't be the IP that is used for all as it is set to 4095?
Andrew Hancock (VMware vExpert PRO / EE Fellow)VMware and Virtualization Consultant
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Commented:
4095 is usually used as a VLAN tag, to accept all VLANS on that network interface.

Please upload screenshots.

Author

Commented:
Hi Andrew,

So being set to 4095 I would think would be the correct solution?

 Andrew i uploading images of the disconnected host. We have 2 virtual switches and honestly not sure how the Vlan5 is also showing on vswitch0, maybe that is the issue.

Vswitch1 has no management network only vswitch0 has one and it has the correct network IP and default Vlan1 infor on it.

Can you let me know if you need additional screens shots. I blacked out sensitive information on the images.

Thanks
Andrew Hancock (VMware vExpert PRO / EE Fellow)VMware and Virtualization Consultant
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Commented:
You would not normally use 4095.

let me have a look at the document you've uploaded.
By any chance does the host have an vmkernel port group assigned?

Author

Commented:
Hi Andrew,

No, I am in the process of configuring VMotion and that is when i discovered the host in a disconnected state and did not proceed.

Author

Commented:
Sorry compdigit44

Author

Commented:
Hi Andrew,

On vswitch0 on the management network properties tab the VLAN ID Optional is set to none 0. Shouldn't this be set to 4095 so we can manage/communicate with both Vlans?

Thanks
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Author

Commented:
Hi Andrew, All Vlan communication is working in the network except for the communication from that host to vcenter, so i thought it may be specific to the management group.  Strange that the native VLAN can not be pinged from the Vcenter, but the Voice Vlan can be thus the host disconnected status.
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Commented:
Gateway is set to the native Vllan IP compdigit44.

I uploaded a screen on this case.

thanks

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