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Figure 19-16: Correct switch choices for Uplinkfast To enable Uplinkfast on a standard IOS switch, simply enter the command spanning-tree uplinkfast in global config mode For CatOS-based switches, use the set spantree uplinkfast enable command Finally, Portfast configuration is a bit more complicated than Uplinkfast and Backbonefast configuration First, unlike the other two enhancements, Portfast is port specific, requiring that you manually configure it on a per-port basis Also, using Portfast on links to other switches can cause serious STP problems, so you must be careful when deciding on the ports to enable for Portfast However, when used correctly, Portfast can transition a port into the forwarding state almost immediately upon connection This quick response allows hosts that require immediate network access upon boot to receive that access with little or no drama Basic Portfast selection and configuration is fairly simple First, determine which links are access links for network hosts For instance, in the example in Figure 19-17, Ports 1 and 3 on Corvette and Ports 4 and 5 on Viper should have Portfast enabled Once the proper ports have been selected, use the spanning-tree portfast interface config command (on standard IOS switches) or the set spantree portfast [module/port] enable command (on CatOS switches) asp.net generate qr code Free c# QR - Code generator - Stack Overflow
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8 Nov 2014 ... You will need to download the QR code library from the following location and open the project in Visual Studio and build it. Once it is build, you ... Figure 19-17: Proper Portfast selection Next, you may want to enable an additional Cisco feature for Portfast, called BPDU guard BPDU guard disables any Portfast-configured port if a BPDU is received on that port It performs this action because, due to the removal of the waiting period for a port to transition to a forwarding state, loops can be caused if a Portfast port is connected to another switch If a port is connected to another switch, spanning tree BPDUs should begin entering the port BPDU guard listens for these BPDUs, and if it detects one, it will immediately disable the port to prevent a loop To enable BPDU guard on a standard IOS switch, use the spanningtree portfast bpdu-guard global config command On a CatOS switch, use the set spantree portfast bpdu-guard command Basic Backbonefast, Uplinkfast, and Portfast configuration commands for both Catalyst 5500 and 3500 switches are shown in the following output: asp.net create qr code QR - Code Web-Control For ASP . NET Developers
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Mature QR Code Barcode Generator Library for creating and drawing QR Code barcodes for ASP . NET , C#, VB.NET, and IIS applications. >3500 Switch Configuration< 3508(config)# spanning-tree backbonefast 3508(config)# spanning-tree uplinkfast 3508(config)#interface GigabitEthernet 0/8 3508(config-if)# spanning-tree portfast >5500 Switch Configuration< Cat5K (enable) set spantree uplinkfast enable VLANs 1-1005 bridge priority set to 49152 The port cost and portvlancost of all ports set to above 3000 Station update rate set to 15 packets/100ms uplinkfast all-protocols field set to off uplinkfast enabled for bridge Cat5K (enable) set spantree uplinkfast disable uplinkfast disabled for bridge Use clear spantree uplinkfast to return stp parameters to default Cat5K (enable) clear spantree uplinkfast This command will cause all portcosts, portvlancosts, and the bridge priority on all vlans to be set to default Do you want to continue (y/n) [n] y VLANs 1-1005 bridge priority set to 32768 The port cost of all bridge ports set to default value The portvlancost of all bridge ports set to default value uplinkfast all-protocols field set to off uplinkfast disabled for bridge Cat5K (enable) set spantree portfast 3/1 enable Warning: Spantree port fast start should only be enabled on ports connected Digital Photography: 99 Easy Tips to Make You Look Like a Pro! to a single host Connecting hubs, concentrators, switches, bridges, etc to a fast start port can cause temporary spanning tree loops Use with caution Spantree port 3/1 fast start enabled Cat5K (enable) set spantree portfast 3/1 disable Spantree port 3/1 fast start disabled Cat5K (enable) set spantree backbonefast enable Backbonefast enabled for all VLANs Cat5K (enable) set spantree backbonefast disable Backbonefast disabled for all VLANs These types of bugs are really nasty because they do not always appear when the overwrite occurred; it depends on how memory is laid out. In addition, they can corrupt the core file the program generates when it crashes, making it difficult to track down the initial cause and location of the error. To generate this class of error within the BuggyServer program, enter the following commands: Fast Etherchannel and Fast Gigachannel are two extremely useful Cisco enhancements to standard STP These technologies allow you to "bundle" or bond up to eight 100-Mbps or 1Gbps ports into a larger logical port, gaining increased bandwidth (up to 8 Gbps!) by causing STP to treat all of the ports as a single logical port To configure a port group on a standard IOS based switch, use the port group [number] command in interface config mode for each of the ports On a CatOS-based switch, use the set port channel [module/port list] mode on command By setting a number of ports to the same group, you configure one larger logical port STP problems are common, but with proper configuration, most can be avoided STP problems typically fall into one of the following categories: The first command generates an error by overwriting past the beginning of the buffer; the second command overwrites past the end of the buffer. Generate an Encapsulated PostScript (EPS) is a format that allows vector and raster art to reside in the same file and gets converted to pixels at the time of printing This allows vector art detail to be maximized for the resolution of the printer Although all of these problems can be significant, bridging loops are perhaps the most disastrous Because this problem is exactly the one STP is designed to solve, encountering a bridging loop should be a rare occurrence Nevertheless, it will still happen occasionally, usually due to an improper configuration To solve this problem, you must first determine the cause Common causes of bridging loops are the following: asp.net vb qr code codebude/QRCoder: A pure C# Open Source QR Code ... - GitHub
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