What is a layer 2 map?

Layer 2 Map. OpManager is a logical network topology diagramming tool and renders the diagram once you discover the networks and network devices. For a better visualization of the physical network connectivity in real networks and the consequences of a failure of a device, network topology map comes handy.

What is an infrastructure map?

The Infrastructure map provides an overview of all monitored systems, which are grouped by named zones (two-dimensional colored rectangles). Within each zone are pillars comprised of opaque blocks. Each pillar as a whole represents one agent running on the respective system.

What is layer 2 for dummies?

Layer 2 of the OSI model is known as the data link layer. The Layer 2 protocol you're likely most familiar with is Ethernet. Devices in an Ethernet network are identified by a MAC (media access control) address, which is generally hardcoded to a particular device and doesn't normally change.

How does layer 2 work?

At a high level, layer-2s typically have two parts: A network that processes transactions and a smart contract on the underlying blockchain that resolves any disputes and achieves consensus on the state of the layer-2 network by cementing it to an underlying blockchain.

What are the three levels of infrastructure?

IT infrastructure exists at three different levels: public, enterprise, and business unit. Each level of infrastructure provides a set of IT services and capabilities.

What are the 5 infrastructure?

Core infrastructure incorporates all the main types of infrastructure, such as roads, highways, railways, public transportation, water, and gas supply.

What is Layer 2 in networking?

What is Layer 2? Layer 2 refers to the data link layer of the network. This is how data moves across the physical links in your network. It's how switches within your network talk to one another. Installing Layer 2 on your infrastructure gives you high-speed connectivity between devices.

What is the difference between Layer 1 and Layer 2 traffic?

Layer 1 provides the physical infrastructure and encoding schemes, ensuring that data can traverse the network medium accurately. Layer 2 builds upon this foundation, framing data and enabling devices to communicate efficiently.

What is Layer 2 vs layer 3?

Layer 2 switches offer limited to no routing capabilities within network segments such as VLANs. Layer 3 switches offer routing between different network segments.

Layer 2 Maps | Online Help Site24x7 (2024)

Networks these days are complexand include manycluttered interconnections. Trackinga network'sconnections and monitoring eachof itsnodes and links requirestechnologythat'scapable of discovering the various layers of that network.The only way to guarantee successful mapping is with a combination of theright mechanismsand a good understanding of how they work.Site24x7'sLayer 2Mapshelps network professionalsview worthwhile information about the physical interconnectionsexistingintheirnetworks.

Layer 2—defined as thedata link layer—discovers port-to-port connections and linking properties.

The Layer 2 Maps view

Log in toSite24x7, clickNetwork on the left panel, and selectLayer 2 Maps.
Here, you can create and view Layer 2 network maps as well as rediscover, edit, and deletemaps.

Figure 1. The Layer 2 Maps view.

Discovery mechanisms

Site24x7 discovers and maps Layer 2 networks based on the following protocols and discovery mechanisms:

Address Resolution Protocol (ARP):ARPis used to map an IP address to a physical address or media access control address (MAC address) that is recognized on the local device. ARP is mainly for layer 3 switches and routers.
Cisco Discovery Protocol (CDP):CDPis used to share information aboutCisco devices that are directly connected. If your device is a Cisco device, we recommendusing CDP for discovery.
ForwardingDatabase (FDB):TheFDBtable is used byLayer 2 devices to store the MAC addresses that have beendiscovered and the ports thoseMAC addresswerediscovered on. In general, switches are discovered usingtheFDB.
IProute: IProutes are routes taken fromarouting table.Routing tables containnecessaryinformationforforwarding a packet along the best path toward its destination. Common routers and switches are discovered usinganIProute.
Link Layer Discovery Protocol (LLDP):LLDPis used toadvertise the identity, capabilities, and neighbors on a wired LAN ethernet.LLDP is used to discover wired LAN ethernets.

Creating Layer 2 maps

Log in toSite24x7.
Navigate toNetwork >Layer 2 Maps > Create New.
In theCreate Map form that opens, enter the following:
- Map Name:Enter a name to identify your map.
- Discover From:Select Devices if you wish to discover and create a network map using a network device that is already being monitored. Select one from the drop-down. If the device is not yet being monitored by Site24x7,chooseIP Addressand, in the box that appears below, enter the IP address of the deviceyou wish to discover and map.
- IP Filters:Enter the start and end IPs of an IP rangeyou want discovered. You should add a minimum of one IP range and can add more by clicking+.
- Credentials to Use:Choose the credentials to use from the drop-down list. You can choose multiple credentials andadd new credentials as well by clicking on+ next to the drop-down list.
- Discovery Mechanisms: Select appropriatediscovery mechanisms from the drop-down list.Selecting FDB or LLDP will automaticallyselect ARP along with it. Always select an additional discovery mechanism while choosing ARP.
- Location Profile:Choose theOn-Premise Poller from which the map has to be discovered(i.e. the On-Premise Poller installed in the same network as the device).
ClickStart Discovery.

Figure 2. Discovering a Layer 2 map.

If your map is not discovered properly, click here to troubleshoot.

Understanding the discovered Layer 2 maps

Discovered and monitored devices are displayed as colored tilesforthe following statuses: green forUp, red forDown, yellow forTrouble, blue forConfiguration error, dark grey forDiscovery in progress, lilac forMaintenance, and light grey forSuspended. Unmonitored devices are displayedaswhite tiles.
By default, the map structure is displayed as Radial Tree structure,butyou canchange it to theNode Linkstructure if you prefer.Once you'vechanged the structure, don't forget to save your view.
You can pan the map, zoom out, or zoom in and, once you've chosen your preferred position, you cansave your changes to retain this position.
Hover over a node to view basic configuration details for the device along with the number of interfaces that areUp, Down, or in Trouble.
Click on a node to view a graph of the network device's real-time performance stats such as response time and packet loss.
Hover overlinks to viewbasic configuration details, operational states, and admin states of the interface.
Click on a link to view a graph of the interface's real-time performance stats like traffic, packets, errors, and discards.
View the status of nodes and links as green, red, or yellow, which denote that they're Up, Down, or inTrouble, respectively.
Viewlinks between network devices turn red or yellow when the connected interface is Down or in Trouble.
ClickRediscoverto obtain the latest status and data of the devices and interfaces.
You can alsoedita map and change IP ranges, credentials, and discovery mechanisms.
Check theping response ofadevice and viewitstraceroute from the map.

Figure 3. Viewing the Layer 2 map.

Editing the map's layout

ClickEdit Layoutto edit the map's layout and adjust the spacing between the links. You can edit the layout for bothRadialTree andNodeLink structures. Basically, both these structures provide you with the same device interconnection mapping. They only differ in the aesthetic view. The Radial Tree looks like a tree with the seed node at the centre. Whereas, in the Node Link structure, the links are arranged level-wise.

RadialTree structure:

RingSpacing: The spacing between the nodes.

Node link structure:

Map Orientation: This caneitherbelandscape or portrait.
Tree Spacing: The depth of the tree.
Node Spacing: The spacing between the nodes.
Sub-tree Spacing: The distance between two sibling nodes.

Adding a discovered device for monitoring

Once your map is discovered,you canadd unmonitored devices for monitoring directly from the map. Selecttheproper credentials,give a proper display name, and start monitoring.

ClickAdd Allto add all the discovered, unmonitored devices for monitoringat once.
Hover over an unmonitored device and clickClick to monitor to start monitoring that device.
You can also click directly on an unmonitored deviceto start monitoring it.

Figure 4. Adding a device for monitoring.

Network topology maps
Visualizing networks
Switch stack monitoring

Layer 2 Maps | Online Help Site24x7 (2024)

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