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Calculation of router bandwidth

To control the congestion,the simple way is to know the free bandwidth space in the router(intermediate node) but i dont know what is the real way to calculate it.could you please help me in this matter by providing me with description & a source code please..

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Easiest way to do this is use QoS (quality of service) if your router supports it.

Posted on Feb 07, 2008

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I wanted to know what is the best wireless router compatible with motorolla SBV5120 cable modem? thank you very much


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Dec 12, 2010 | Computers & Internet

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How to divide bandwidth using cisco routers


The Bandwidth command's real purpose
First, let's discuss the real purpose of the bandwidth command. In the above scenario, the questioning administrator didn't understand the true purpose of this command, incorrectly assuming instead that the network would receive the bandwidth configured with the command.
The bandwidth command is only there to communicate the speed of the interface to higher level protocols. Most of the time, a routing protocol needs to know the speed of the interface so it can choose the best route.
In the case of routing protocols, IGRP, EIGRP, and OSPF all use the bandwidth statement. However, TCP will also adjust its initial retransmission parameters based on the bandwidth configured on the interface.
OSPF uses cost as its routing metric, which it calculates using bandwidth. For example, OSPF takes 108 and divides it by the bandwidth of the interface. To calculate the cost of a full T1, OSPF divides 100,000,000 by 1,544,000, which returns an OSPF cost of 64. (Cisco routers don't use floating-point math, so they drop the numbers after the decimal.)
On the other hand, EIGRP uses the bandwidth of the link to calculate its routing metric. Here's the EIGRP metric formula:
metric = [K1*bandwidth + (K2*bandwidth)/(256 - load) + K3*delay] * [K5/(reliability + K4)] We won't try to calculate a metric in this article, but as you can see, the process definitely requires using bandwidth. In fact, due to the default K values, the only values used to calculate the EIGRP metric are bandwidth and delay.
Examples You configure the Cisco IOS bandwidth command on interfaces. Here's an example:
interface Serial0/0 bandwidth 128 ip address 1.1.1.1 255.255.255.0 This command has only one option—the bandwidth, in kilobits, of the interface.
Router(config-if)# bandwidth ? <1-10000000> Bandwidth in kilobits Router(config-if)#bandwidth There are always default bandwidth values set for each type of interface, such as the Serial interface, as shown below:
Router# show interface s0/0 Serial0/0 is administratively down, line protocol is down Hardware is PowerQUICC Serial MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, In the case of a serial interface, the default bandwidth is 1,544 K (or a full T1 circuit). However, you could have a fractional T1 circuit, and the default may be incorrect.
As you can see, setting the correct bandwidth on each interface is very important when it comes to routing protocols choosing the right router. However, no matter what you set the bandwidth command to, you won't actually get faster throughput out of any interface—the two simply aren't related.

on Apr 24, 2010 | Cisco 2610XM Router

2 Answers

My sister has skype and her equipment is working well. I have skype also and my equipment is also working well. When she calles on skype, free call, she can hear me well but I cannot hear her. When her...


I guess this has something to do with the status of your bandwidth. It might be that your incoming bandwidth is congested and it's not able to handle incoming voice traffic.
To verify if it's a bandwidth issue please visit this site to check your upload and download speeds.
Hope this helps . . .

Apr 03, 2010 | Skype IM

1 Answer

Slowed internet connection using wireless router...


Normal!

Wired connections are faster than equivalently wireless connections (from/to the same node) and so your
experienced is quite normal.

Additional nodes divide the original bandwidth and denigrate the performance, which is why one tries to
maximize the original bandwidth (speed in MHz) of the connection to the gateway.

You can maximize your experience by having critical systems wired to the router, and this also provides
greater security than any encryption (which is another brake on your speed) necessary for a wifi
connection.

Make sure you have the fastest possible wifi card in your portable devices to maximize your speed.

Apr 10, 2009 | Linksys Wireless-G WRT54G Router

1 Answer

Need Source Code


well i'm working on the same project. I also have a problem

Jan 22, 2009 | Computers & Internet

1 Answer

How fast can the data go?


The speed of the cable modem is only one part of the equation. There are a combination of factors starting with how fast your PC can handle IP traffic, then how fast your PC to cable modem interface is, then how fast the cable modem system runs and how much congestion there is on the cable network, then how big a pipe there is at the head end to the rest of the Internet. Different models of PCs and Macs are able to handle IP traffic at varying speeds. Very few can handle it at 30 Mbps. Ethernet (10baseT) is the most popular cable modem interface standard for the PC. This automatically limits the speed of the connection to under 10 Mbps even if the cable modem can receive at 30 Mbps. Most Local Area Networks use 10baseT Ethernet, and although they are 10 Mbps networks, it takes a LOT longer than one second to transmit 10 megabits (or 1.25 megabytes) of data from one terminal to another. Cable modems on the same node share bandwidth, which means that congestion is created when too many people are on simultaneously. One user downloading large graphic or video files can use a significant portion of shared bandwidth, slowing down access for other users in the same neighborhood. Most independent Internet Service Providers today connect to the Internet using a single 1.5 Mbps "T1" telephone line. All of their subscribers share that 1.5 Mbps pipeline. Cable head-ends connecting to the Internet backbone using a T1 limit their subscribers to an absolute maximum of 1.5 Mbps. To create the appearance of faster network access, service companies plan to store or "cache" frequently requested web sites and Usenet newsgroups on a server at their head-end. Storing data locally will remove some of the bottleneck at the backbone connection. How fast can they go? In a perfect world (or lab) they can receive data at speeds up to 30 Mbps. In the real world, with cost conscious cable companies running the systems, the speed will probably fall to about 1.5 Mbps.

Feb 19, 2006 | Zyxel Prestige 310 (AM406100) Router

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