A device advertises information about itself and listens for information coming from others. Neighbor discovery protocols work with a simple yet powerful concept. In fact, CDP stands for Cisco Discovery Protocol while LLDP stands for Link-Layer Discovery protocol. CDP is a Cisco proprietary protocol, while LLDP is an open-standard protocol.
Both protocols do the same thing almost identically, with the major difference being the vendor. Some theory about CDP and LLDP What are CDP and LLDP?īoth CDP and LLDP are neighbor discovery protocols that can operate in an IEEE 802 environment (Ethernet). Typeīefore we dive into configuration and exploration, we should talk a little about how these protocols work. Therefore, get ready with a piece of paper. This means that you are going to draw switches and routers, and links interconnecting them.
Moreover, you will also have to draw the topology of the network as we discover it. You are going to populate it as we advance with the discovery. Use the following columns: hostname, IP address(es), and Device Type (Switch or Router). Distribution switch must be run both CDP and LLDPįor the discovery part of this lab, I suggest you write down a table.Access switches must have CDP disabled on access ports ( Fa0/1 - 24).Here we have the configuration requirements Then we will have to use the protocols we configured, along with telnet, to discover other devices in the cloud and connect to them. This is all the configuration we have to do. First, we are going to configure and tune both CDP (Cisco Discovery Protocol) and LLDP (Link-Layer Discovery Protocol) on the three switches we can see. We will work on these switches to tune CDP and LLDP behavior, then we will use telnet to explore the cloud. You can print resource maps to any standard printer.Įxporting a resource map saves the map to an image file.Besides the three switches, the rest of the network is hidden to be discovered.Īs you can see from the topology, we have three switches connected together, and one of them connected to the cloud. Maps for specific objects show only the object relationships for that object. You can view a resource map for an entire vCenter Server system or for a specific object, such as a datacenter or cluster. Resource maps enable you to view the relationships among hosts, clusters, and virtual machines. You can set the maximum number of objects maps can display so that maps load more quickly and are easier to read. In large environments, maps can be slow to load and difficult to read. Right-click on any object in a map to access its context menu. You can double-click any object in a map to switch to the Map tab for that item (providing a Map tab is available for that type of object). You can resize the grey box to zoom in or out of a section of the map. A grey box in the overview area represents the section of the total map that is viewable and moves as you drag the map. You can reposition the map by dragging it (click and hold anywhere on the map and drag the map to the new location). You can customize a map view by selecting or deselecting objects in the inventory pane or by selecting or deselecting options in the Map Relationships area.
For virtual machine inventory items, the vMotion Resources view is the only map view available on the Maps tab. If you are using the Maps tab of a selected inventory item, only items related to that item are displayed. If you are accessing map views using the navigation bar, all vCenter Server resources are available for display. You can customize all map views, except vMotion Resources maps.
You can use a map view to limit or expand the scope of a map. Virtual Machine Resourcesĭisplays virtual machine-centric relationships.ĭisplays datastore-centric relationships.ĭisplays hosts available for vMotion migration. vCenter Server provides the following map views. The maps can help you determine such things as which clusters or hosts are most densely populated, which networks are most critical, and which storage devices are being utilized. Maps are available only when the vSphere Client is connected to a vCenter Server system. Maps show the relationships between the virtual and physical resources available to vCenter Server. A vCenter map is a visual representation of your vCenter Server topology.
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