THGs is a powerful network performance analyzer that can be accessed locally or remotely controlled by Surveyor software for effective diagnosis, fault identification and monitoring of any full or half duplex 10 M/100 M/M Ethernet network provides necessary tools.
Figure: distributed network protocol analyzer-THGs THGsE:The high-performance architecture of THGs analyzer, a combination of silicon acceleration hardware and MIPS R4000 processor, can capture every data information and find network
status, for example:% PM-SP-4-ERR_DISABLE: udld.Error DetectedOn gi2/1, putting gi2/1 inErr-Disable state.
5. Link oscillation error:In a short period of time, the port is always in the up/down state. If the port continuously oscillates for five times within 10 seconds, the port is set to err-disabled, for example:% PM-4-ERR_DISABLE: Link-flapError DetectedOn gi2/1, putting gi2/1 inErr-Disable state
You can run the following command to view the different oscillating values:Nuaiko # Show err
bypass the optical fiber during use, which will increase the attenuation of the light during transmission.
After the optical jumper is used, you must use a protective cover to protect the Optical Fiber Connector. Dust and oil stains may damage the coupling of the optical fiber.
Abbreviations
SFP: Small Form Factor Pluggable
SFF: Small Form Factor
XFP: 10 Gigabit Small Form Factor Pluggable
MU: Miniature Unit 54ne.com
LC: Lucent Connector
SC: Subscriber Connector
FC: Fiber Connector
MTRJ: 'mt'
business model. Therefore, they usually have a large scale and a large number of workstations, many of the PCs are diskless PXE boot methods. In addition, Internet cafes also provide various services such as online competitive games, video chats, and VOD. Therefore, in the solution, core network devices must have high capacity, it is necessary to fully meet the network bandwidth needs of Internet users and provide fast Intelligent Processing. At the same time, because the network applications i
optical module Mainly includes Optical electronic devices, functional circuits and optical interfaces, etc., is an important device in optical communication Now let fast fiber optics (feisu.com) I. Look at the demandIt's good to see. whether the requirements are met , such as clothes have many styles, light modules also have many kinds of, mainly divided into: GBIC, SFP, SFP +, XFP, SFF, CFP, etc., optical interface types include SC a
A Dell machine with a network card of M is connected to a Cisco switch. The error err-disabled occurs because of link-flap, that is, the network card is up and down too frequently in a short time. This error is not returned when a vswitch interface is changed. The cause is unknown.
Link-flap description:
Link-flap Error
Link flap means that the interface continually goes up and down. the interface is put into the errdisabled state if it flaps more than five times in 10 seconds. the comm
Fast Ethernet and Gigabit Ethernet line cards
The Cisco Catalyst 4500 series scalable, modular, and high-density switches provide superior combined second-layer switching and intelligent services, which enable network control and sustainability. These switches provide a wide range of Fast Ethernet and Gigabit Ethernet line cards, including the desktop, branch backbone and servers for enterprise and commercial Exchange solutions, and the fiber and copper interfaces optimized for service Supply m
the recovery function of SDH network.
Mippo Ethernet: Enables Ethernet networks to be transmitted through multiple wavelengths or multiple light waves or a single optical fiber, thereby greatly increasing network capacity.
CWDM: Compared with DWDM, CWDM is more suitable for building a metropolitan network, it transmits a small number of wavelengths in one fiber, while CWDM equipment is cheaper and consumes less power, some manufacturers have already introduced the CWDM
The method used is to assign IP to the user by DHCP, and then limit the way that these users can only use dynamic IP, if it is changed to static IP mode can not connect to the network; that is, the DHCP snooping function is used.
Example:
Version 12.1No service padService Timestamps Debug UptimeService Timestamps Log uptimeNo service password-encryptionService Compress-config!Hostname c4-2_4506!Enable Password xxxxxxx!Clock timezone GMT 8IP Subnet-zeroNo IP do main-lookup!IP DHCP snooping VLAN
With the upgrade of routing technology, the function of wireless router is also increasing, here mainly analyzes the function of wireless router DD-WRT, the latest 54M wireless router Netgear KWGR614, not only with two 2 DBI detachable antenna, expanded memory, the biggest feature is to support the DD-WRT function, users can brush their own driver, so that this product can play more functions.
Since the KWGR614 Software Based on Linux kernel, enthusia
manage your vrouters and can only initialize them with a toothpick.
◆ If a new computer or mobile phone needs to access the network, access 192.168.1.1 through the computer and configure the MAC access list. Access the management page of the 2nd routers through 192.168.1.99.
The above test of the wireless router relay function is the netgear router-WGR614V9. Of course if you only have one router, the encryption method directly choose WPA2-PSK (AES),
http://wangye.org/blog/archives/845/Recently began to toss up Raspberry Pi came, because somewhere in the internet need Ruijie dialing, so I would like to be able to let my Raspberry Pi do, of course, first of all to transform it into a router, the default comes with the network as a WAN port, we also lack a network port, Wood has a way, had to occupy a USB port, Connected to a USB card, the network of USB to RJ45 network cable adapter Less, the price is not cheap, so consider simply transform i
Once the router of the Alpha route data packet transmission link establishes an adjacent relationship, it can create a link status data packet, which contains the link status information related to the link, including the link type, IP address, subnet mask, and overhead, this article describes the data packet transmission characteristics of the Alpha router when creating a link. If you are interested, you can pay attention to the NetGear router settin
The 1-gigabit layer-3 switch is quite common, so I have studied the 1-gigabit layer-3 Switch with high port flexibility. Here I will share it with you and hope it will be useful to you. After the success of the Gigabit center switch gmt7324, NETGEAR recently launched a more advanced layer-3 gmt7312 switch with more flexible port configurations.
GSM7312 provides advanced features such as GSM7324's rich layer-2 switching, layer-3 routing, and QoS of ser
A comprehensive explanation of the flexible configuration of gigabit core switches, many problems will be encountered during access to gigabit core switches, and how to solve these problems has become a necessary task for everyone, the following describes how to coordinate Ge core switches and other problems.
After the success of the gigabit core switch GSM7324, NETGEAR recently launched a more advanced GSM7312 gigabit core switch with more flexible p
specified bandwidth for a specific data stream), the results are different, resource Reservation is indispensable to ensure that sufficient bandwidth is available during connection establishment.
Policy support
A policy is a rule that controls the behavior of a vswitch. The Network Administrator uses the policy to allocate bandwidth, priority, and control network access to the application stream, the focus is on the bandwidth management policies required to meet the service level agreement and
Wireless Network Card. I am using netgearwgw.v2 of PCMCIA Interface. Ubuntu7.10 does not provide its driver by default, so we need to install the driver on our own. First, prepare the Windows driver for the wireless Nic, which must correspond to the NIC Driver. inf file and. sys file. You can find sudoapt-getinstallndiswrapper-commonndiswrapp in the "Windows" inf folder after the driver is installed.
Wireless Network Card. I am using Netgear WG511 v2
TV based on the p2p principle. The high-id ratio is higher than the low-id ratio, but the high-id ratio is very helpful for the connection speed. generally, the water route will be disconnected after a long time. however, the quality and stability of this wireless router are poor, and the repair process is very high. it took me one month to get down, and I got down again five days after I got back. continue to repair now. my rp is poor. ^_^!
4. NETGEAR
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