qr code c# sample Spanning Tree Protocol in Objective-C

Create Quick Response Code in Objective-C Spanning Tree Protocol

Spanning Tree Protocol
QR Code Generation In Objective-C
Using Barcode generator for iPhone Control to generate, create QR image in iPhone applications.
Drawing Bar Code In Objective-C
Using Barcode encoder for iPhone Control to generate, create bar code image in iPhone applications.
Bridge Protocol Data Units
Printing QR Code 2d Barcode In C#
Using Barcode encoder for .NET Control to generate, create QR Code JIS X 0510 image in .NET framework applications.
QR Code JIS X 0510 Creation In VS .NET
Using Barcode encoder for ASP.NET Control to generate, create QR Code JIS X 0510 image in ASP.NET applications.
For STP to function, the switches need to share information about themselves and their connections What they share are Bridge Protocol Data Units (BPDUs), which are sent out as multicast frames to which only other layer 2 switches or bridges are listening Switches will use BPDUs to learn the topology of the network: what switch is connected to other switches, and whether any layer 2 loops are based on this topology If any loops are found, the switches will logically disable a port or ports in the topology to ensure that there are no loops Note that they don t actually shut down the ports, but they place the port or ports in a special disabled state for user traffic, as discussed later in the Port States section Based on this port disabling process in other words, from one device to any other device in the layer 2 network only one path can be taken If any changes occur in the layer 2 network such as when a link goes down, a new link is added, a new switch is added, or a switch fails the switches will share this information, causing the STP algorithm to be re-executed, and a new loop-free topology is then created By default, BPDUs are sent out every 2 seconds This helps speed up convergence Convergence is a term used in networking to describe the amount of time it takes to deal with changes and get the network back up and running The shorter the time period to find and fix problems, the quicker your network is back online Setting the BPDU advertisement time to 2 seconds allows changes to be quickly shared with all the other switches in the network, reducing the amount of time any disruption would create BPDUs contain a lot of information to help the switches determine the topology and any loops that result from that topology For instance, each bridge has a unique identifier, called a bridge or switch ID This is typically the priority of the switch and the MAC address of the switch itself When switches advertise a BPDU, they place their switch ID in the BPDU so that a receiving switch can tell from which switch it is receiving topology information The following sections cover the steps that occur while STP is being executed in a layer 2 network
Encode QR Code 2d Barcode In .NET
Using Barcode encoder for .NET framework Control to generate, create QR Code JIS X 0510 image in .NET framework applications.
Drawing QR Code In Visual Basic .NET
Using Barcode drawer for .NET Control to generate, create Quick Response Code image in .NET applications.
Most bridges and switches two secondsThe BPDU contains the use IEEE s 8021d protocol to remove loops switch s ID, made up of a priority value and BPDUs are used to share information, the switch s MAC address and they are sent out as multicasts every
Print Barcode In Objective-C
Using Barcode generator for iPhone Control to generate, create bar code image in iPhone applications.
Paint UPC-A Supplement 2 In Objective-C
Using Barcode generator for iPhone Control to generate, create UPC Symbol image in iPhone applications.
14: Switches and Redundancy
Code 128A Creation In Objective-C
Using Barcode creator for iPhone Control to generate, create Code 128 Code Set C image in iPhone applications.
Draw UCC-128 In Objective-C
Using Barcode generation for iPhone Control to generate, create GS1 128 image in iPhone applications.
Root Switch
Barcode Encoder In Objective-C
Using Barcode generator for iPhone Control to generate, create bar code image in iPhone applications.
Data Matrix 2d Barcode Drawer In Objective-C
Using Barcode drawer for iPhone Control to generate, create Data Matrix 2d barcode image in iPhone applications.
The term Spanning Tree Protocol describes the process that is used to find and remove loops from a layer 2 network The STP algorithm is similar to how link state routing protocols, such as Open Shortest Path First (OSPF), ensure that no layer 3 loops are created; of course, STP deals only with layer 2 loops (link state routing protocols are discussed in s 15 and 20) A spanning tree is first created Basically, a spanning tree is an inverted tree At the top of the tree is the root, or what is referred to in STP as the root bridge or switch From the root switch, branches (physical Ethernet connections) extend and connect to other switches, and branches from these switches connect to other switches, and so on Take a look at the physical topology of a network, shown in Figure 14-3, to demonstrate a spanning tree When STP is run, a logical tree structure is built, like that shown in Figure 14-4 As you can see from Figure 14-4, Switch-A is the root switch and is at the top of the tree Underneath it are two branches connecting to Switch-B and Switch-C These two switches are connected to Switch-E, creating a loop Switch-B is also connected to Switch-D At this point, STP is still running, and a loop still exists As STP runs, the switches will determine, out of the four switches Switch-A, Switch-B, Switch-C, and Switch-E which port on these switches will be logically disabled in order to remove the loop This ensures that from one device to any other device in the network, only one path will be used to connect the devices Actually, the very first step in STP is to elect the root switch BPDUs are used for the election process As mentioned earlier, when a device advertises a BPDU, the switch puts its switch ID in the BPDU The switch ID is used to elect the root switch
UPC-E Creator In Objective-C
Using Barcode generation for iPhone Control to generate, create UPCE image in iPhone applications.
Bar Code Creation In None
Using Barcode drawer for Software Control to generate, create barcode image in Software applications.
FIGURE 14-3
Bar Code Creator In .NET
Using Barcode creation for Reporting Service Control to generate, create bar code image in Reporting Service applications.
Recognize EAN13 In VS .NET
Using Barcode scanner for .NET Control to read, scan read, scan image in .NET framework applications.
Data Matrix 2d Barcode Creation In None
Using Barcode generator for Software Control to generate, create DataMatrix image in Software applications.
Recognizing Code 128B In VB.NET
Using Barcode decoder for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Bar Code Maker In Java
Using Barcode printer for Android Control to generate, create bar code image in Android applications.
Print UPC - 13 In C#.NET
Using Barcode encoder for VS .NET Control to generate, create GTIN - 13 image in VS .NET applications.
Copyright © OnBarcode.com . All rights reserved.