vsphere

Today I observed a strange behaviour of several VMs at a customer. Several VMs in a cluster showed an alarm, but neither on the alarm tab of the VM, nor the alarm section at the bottom of the C# client showed an error. Patrick Terlisten/ vcloudnine.de/ Creative Commons CC0 The customer still uses vSphere 5.0. An upgrade to 5.5 is on the roadmap. The symptoms: not all VMs in the cluster were affected all, except one VM, were running on one specific host the alarm on a VM disappeared after a vMotion no trigger for the alarm could be found vSphere HA status “protected” The similar behaviour could be observed, if a VM is moved to another cluster using VMware vMotion technology.

The Cisco Discovery Protocol (CDP) is used to discover and advertise the identity and capabilities of a network component to other networking components. CDP a proprietary protocol developed by Cisco, so it’s often used on Cisco switches and routers. The Link Layer Discovery Protocol (LLDP) is a vendor-neutral discovery protocol, which is used e.g. by Hewlett-Packard. With CDP or LLDP you can easily get an overview over a network topology. You can quickly check, e.