Not able to ping the servers - request time out

Hi

We use VMware, I am not able to ping some of the servers which includes the DC as well.
I am pinging them from my laptop that is connected to the core switch. Please let me know how to trouble shoot this. Also I went to the Vsphere console and right clicked the DC1 and open console and logged in to the DC1 and when I ping other servers from the DC 1, it is not pinging, I get request time out, and some times it pings.
We have a cores switch and LACP done on it, will this be a problem with core switch.
Not sure where the problem could be.
Please let me know how to trouble shoot this

Thanks
Any help to troubleshoot would be great
lianne143Asked:
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Norm DickinsonGuruCommented:
You may be on a different VLAN or segment of the network when trying to ping? That would be controlled at the router or firewall typically, but also could be a smart switch.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
LACP is this configured for the ESXi hosts ?

are you using standard or distributed switches, because LACP is NOT SUPPORTED for ESXi hosts, only static trunks.

Note: LACP is only supported in vSphere 5.1, 5.5 and 6.0 with vSphere Distributed Switches and on the Cisco Nexus 1000V.

Source - see here

Sample configuration of EtherChannel / Link Aggregation Control Protocol (LACP) with ESXi/ESX and Cisco/HP switches (1004048)

Also make sure ALL VMs are using VMXNET3 interface, and VMware Tools is installed to support this interface.
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lianne143Author Commented:
previous before the problem has happened, I  have successfully pinged the servers from the same LAN cable connected to the core switch.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
did you read my post ?
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lianne143Author Commented:
We have 2 brocade switches for SAN  and  LACP is configured on cisco switches, but not sure if LACP is configured for ESX .
It was a working setup, all of sudden the network went down, will it be an issue with the brocade switches ?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
LACP not supported for ESXi.
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lianne143Author Commented:
Is there a way to find, if LACP is configured for ESXi
In case if it was configured at first instance, it must have not worked , it has been running from last 3 years.
Just my thought.
This is a new type of problem which has happened today, which I have come across for the first time.
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Norm DickinsonGuruCommented:
Don't overlook the various cabling issues that could be present. Check connections and maybe give the relevant connections a little push to ensure they are fully seated. Sometimes the biggest problems stem from simple issues like connectors not being snug.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Check your physical port groups on the physical switches, are they configured for LACP.

Do you use trunk ports to connect physical switches to ESXi ?

There is nothing to check on ESXi.
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compdigit44Commented:
So this was working then broke. Let's take a look back at the event before the problem started.

1) Any changes to the network switch / vCenter vDS?
2) Can you please upload a screen shot of the setting on one of your vDS in regards to its teaming policy
3) Are your vDS ports group tagging traffic or is the physical switch?
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