Questions tagged [bandwidth]

For questions about bandwidth where bandwidth is the amount of data that can be carried from one point to another in a given time period (usually a second). This tag is suitable when your question is about network congestion, speed, throughput and of course low bandwidth problems.

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3
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2answers
542 views

Switch bandwidth management

How is bandwidth managed in an unmanaged network switch? Suppose that port 1 is connected to a a very busy server. If suddenly machines connected to ports 2, 3 and 4 decide to send a massive amount ...
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1answer
811 views

How to verify that the connection is 10G? [closed]

I have 2 servers connected with 10G cable between them directly. I need to know that the connection is good and it has indeed 10G throughput. I used IPERF to verify the bandwidth. According to the ...
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2answers
1k views

how can i monitor traffic on particular port in 3650 L3 switch?

I have cisco WS-C3650-48TS SW version 03.03.05SE as L3, i need to monitor the traffic on a trunk port? How much bandwidth its consuming?
2
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1answer
37 views

What is the N½ value of a network?

In the context of HPC interconnect networks (Infiniband, OmniPath, ...), I've come across the notion of the N½ value of the network, which is supposedly some performance number. What is this number? ...
3
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1answer
936 views

understanding Policy map bandwidth , police, shape commands

Can some one please help me understand the below QOS setting on our MPLS router the service policy.. Policy map and class map I know the basic understanding behind how these work .. I need to in ...
2
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1answer
19k views

How to know the interface utilization on a Cisco switch?

I would like to confirm. Is the above below information in bold sufficient to know the utilization of my interface in percentage? Switch#sho int fa0/8 FastEthernet0/8 is up, line protocol is up (...
5
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2answers
4k views

Switch Buffer Sizing

What is the relationship between a switches buffer size and the effect it has on latency? I am aware of the bufferbloat issue and understand that buffers that are too large in networks of slower BW (i....
4
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1answer
1k views

How does bandwidth throttling work

I'm trying to understand the basic mechanics of how throttling works. Here are two scenarios: Scenario 1: A hotel offers a fast and slow connection option to its guests. Let's say the slow plan is ...
0
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1answer
181 views

What would be faster between a consumer 1gbps symmetrical Internet connection and a 1gbps data center link to the Internet? [closed]

Say I've got: a home server with a consumer fiber optic Internet connection via FTTH nearing 1gbps downstream/upstream a dedicated server with the exact same hardware specifications in a data center ...
2
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1answer
3k views

Time Division Multiplexing and Transmission Rate

According to my textbook, with TDM, each circuit gets all of the bandwidth periodically during brief intervals of time (that is, during slots). If we have a circuit switched network where each link ...
2
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1answer
2k views

Significance of Bisection Bandwidth, Full Bisection Bandwidth, Subscription and their differences

I am confused by the terms Bisection Bandwidth, Full Bisection Bandwidth, and (Over/Under)-subscription. How do they all relate to one another in Data centres and in the general sense? I believe ...
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1answer
343 views

questions about link aggregation

How many interfaces can we group as a link aggregation on a Cisco switch? How many interfaces, if they all are full duplex? Can we check the value of used bandwidth of ether channel group? How many ...
2
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1answer
3k views

Understanding bisection bandwidth

I have trouble understanding the concept of bisection bandwidth in high performance computing clusters. Wikipedia article on bisection bandwidth, and online materials say that bisection bandwidth is ...
4
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4answers
3k views

Delays and throughput

I have the following Questions regarding Delays and throughput Is transmission rate same as Bandwidth? What is throughput and while calculating throughput why do we consider transmission delay. ...
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1answer
84 views

In what situations would the EIGRP process use the default 50% of the configured interface bandwidth?

I am in a class which conforms to the material in the Cisco Companion Guides, and I am currently using the Scaling Networks textbook. In it, the book explains how to adjust the percentage of ...
2
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2answers
109 views

full utilization of bandwidth and its physical significance

I was reading the following extract: A LFN is a network that offers a high bandwidth but also a very high delay. An example could be a satellite connection. These connections offer a high ...
1
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1answer
105 views

Overutilized spikes on a 128k circuit

If I have a client on a 128k MPLS circuit going through a Cisco 2900 router and using QoS that's splitting it up into two 64k tunnels, is it possible for traffic to spike up to 256k for a short period ...
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2answers
147 views

Why does throughput (consumed BW) increase when the packet error rate is increased in the TCP?

I was simulating TCP used by dailymotion.com, and I noticed that when I increased packet error rate, the consumed BW was increased. How?
34
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5answers
8k views

Why are Ethernet Standards written in the form of 10/100/1000? Why not just 1000?

I always have seen Ethernet Standards written in the form "low value/middle value/max value", and always wondered why. Won't a router just reproduce a lower speeds anything below its maximum if it's ...
5
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2answers
16k views

Switch Fabric Capacity vs Forwarding Rate

What is the difference between Switch Fabric Capacity and Forwarding Rate of a switch? Also, what other types of speed or bandwidth are there for switching?
6
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2answers
226 views

Merging multiple clients to one gigabit

Suppose I have a switch that supports Gigabit Connections and Auto Uplink. Also, suppose that I have 4 clients (A, B, C and D), each with 100Mbps NIC's connected to the Gigabit Switch such that the ...
2
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1answer
239 views

Rate limit based on VLAN

My ISP company has some PoPs in remote areas, as shown in diagram. It is currently, it's getting all prefixes from Local IX and getting only a default route from the upstream Internet provider. ...
1
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1answer
159 views

Throttling Internet speed to device or vlan

I have a Netgear FVS318N Firewall/Router, GS752TP Switch, and a Netgear WNAP210 AP. After a bit of searching, I have identified a machine that is using the lion's share of bandwidth (youtube). Is it ...
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1answer
180 views

Understanding sliding window technique via real example

I have two questions: Can someone simplify the knowledge of windowing that is commonly used by connection-oriented protocols like TCP? I generally understand it is a technique for flow control but I ...
3
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2answers
465 views

Network latency and network bandwidth correlation

Today I was pinging random websites, and I decided to ping a website, from which I was downloading at the speed of 2mb/s, and the ping(latency) was 10 ms. My question is, if the answer from the ...
2
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1answer
2k views

How to calculate propagation speed?

Two routers are connected via ethernet, to find the propagation delay between them, we calculate Distance/Propagation_Speed. How do I find the propagation speed between the two routers?
2
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1answer
257 views

Understanding the effect of transmission rate change in network

Suppose there are 4 switches connected using a normal ethernet cables of speed 100mbps as follows: (S1)---100mbps---->(S2)----100mbps--->(S3)----100mbps--->(S4) Now suppose the link between ...
6
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4answers
16k views

Tunnel interface bandwidth?

I am a little confused with the bandwidth setting on Tunnel interfaces between two Cisco devices. On each end I have Cisco routers with ten gig interfaces connected to my provider. I Have a tunnel ...
1
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1answer
677 views

SNMP bandwidth and response time

I've been trying to learn about SNMP Protocol (as a beginner) When studying network performance, we look at three main points: - Bandwidth - Response Time - Devices Availability But which of these ...
0
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1answer
4k views

GNS3: performance tests using iperf3? [duplicate]

I'm running some performance tests on GNS3 (I know I shouldn't, but it is not until Friday that I will have the college lab available), and I'm trying to compare real BW or "speed" and ...
3
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1answer
211 views

Throttle traffic over a link?

I work for a global company in the client support department. Another department manages the network. My team is frequently asked to throttle client traffic from our on-premises Apple software update ...
3
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3answers
220 views

Bandwidth is mimimum of the path?

Assume the Internet speed is 10 MBps, NIC is GigabitEthernet, PCI bus connecting to RAM is 133 MBps, disk IO is 70 MBps, and this server simply accepts files and stores them to disk and then returns ...
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1answer
110 views

NIC speed and PCI bus speed to be synchronized?

Is there any advantage point of having a Gigabit Ethernet if the PCI bus connecting NIC to Memory is a lot slower than that say just 80 MBps? In other words, I am trying to conclude that it makes ...
1
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1answer
339 views

Load Balance with TL-R470T+

I have the TL-R470T+ and i have two different internet connections from two different ISPs. One 39 Mbps and the other 5 mbps and i want to get 44 mbps. When i installed the router on the speedtest ...
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1answer
115 views

Network Requirements for Video Streaming

My client is thinking about implementing a cloud-hosted video streaming solution for their company. Ideally they want to be able to have 3k+ users watch a video at the same time and have it be ...
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2answers
191 views

ifHCOutOctets doesn't working with snmpget

How do i get counter64 to monitor hight bandwidth using snmp? Counter32 works! spatel@MBP:~$ snmpget -v1 -c public switch.cisco.com ifOutOctets.50 IF-MIB::ifOutOctets.50 = Counter32: 2038072800 ...
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0answers
208 views

What could be causing slow bandwidth on a Cisco 2801 ADSL connection

I have a generic ADSL router that supports dual bridge and pppoe mode. I have an ADSL account configured on the ADSL router, and have the same ADSL account configured as a pppoe connection on a cisco ...
2
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1answer
442 views

QoS in a small network

I have a small engineering network with a Linux router, LAN nodes on the one side of the router, and a WAN link attached to the router. The WAN link is a 16mbit/s wireless channel, while the LAN nodes ...
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0answers
2k views

Get interface input/output rate statistics over SNMP from Huawei switch

We need to monitor the download/upload bandwidth on interfaces on Huawei S5300 switches, and we need to do it with a specific monitoring system. This system can get information from a switch using ...
0
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2answers
100 views

Bandwidth usage in accessing Local file server with external URL

I have a file server in my local network with publicly accessible web url e.g. example.test-server.com Local IP for the server is 192.168.1.10 The local iP of my pc is 192.168.1.11 Now, we have ...
1
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1answer
483 views

High-Resolution Measurement of link utilization of Cisco (Nexus) Switch Interfaces

For a research project I need low timescale interface utilization measurement on a Cisco Nexus 5000 devices and some fabric extenders. Background: The switch is used to "simulate" an optical network, ...
2
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1answer
2k views

How to Block Torrents Using NBAR

I have a Cisco 1900 Series router running and I have issued whereby clients running torrents take all the bandwidth for their own use while business users suffer the damage. I tried setting up nbar ...
1
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3answers
168 views

How do cable internet providers limit user bandwith?

How cable internet providers limit their bandwith? Are they using SFTP service? If yes, how does all that work?
2
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3answers
2k views

Why is 10Gb SFP+ port showing 4.3Gbps Speed?

I have been trying to diagnoise this problem for a while (slow 10Gb connection). I thought it might be firmware or settings related(MTU). How ever while looking through some SNMP stuff I discovered ...
9
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2answers
17k views

Trying to find out exact TCP overhead cost

Corresponding this topic: https://stackoverflow.com/questions/3613989/what-of-traffic-is-network-overhead-on-top-of-http-s-requests The maximum segment size (which does not include the TCP or IP ...
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2answers
714 views

Meaning of 2 Mbps

I read this article - https://rescomp.stanford.edu/~cheshire/rants/Latency.html I have a 2 Mbps private link. This means that I can transfer at the rate of 2*10^6 bits per second ~= 250*10^3 bytes per ...
3
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2answers
1k views

If I UDP multicast to 10 listeners in a multicast group, will my upload bandwidth usage increase by 10 fold?

My internet has an upload limit of 1 Mb/s. If I am in a UDP multicast group with 10 people and I send something to the group at a rate of .1 Mb/s, will my upload rate be 0.1 Mb/s or 1.0 Mb/s? Assume ...
7
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1answer
254 views

Throttling among Data Centers

In general, links among data centers are shared (having shared network infrastructure). Thus, I can't detect the available bandwidth in between two data centers that may vary every while and through ...
5
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1answer
13k views

How To Limit a VLAN to a Specific Bandwidth Quota

I have a Cisco Router 1900 series and I would like to limit the bandwidth used by a subnet/subinterface. This subnet/subinterface (192.168.10.*) uses most of the bandwidth making it useless for other ...
0
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1answer
156 views

Cisco IOS limit bandwidth to domain (wildcard) [closed]

I'm fairly new to Cisco IOS configuration. I have an 800-series router and, long story short, I'd like to limit the incoming and outgoing bandwidth allocated to some iCloud servers to prevent ...