Problems when running IGP IBGP encounter：BGP routing updates only the best entries

The internet

BGP recently doing exercises，Do the following topology when encountered some problems，This topology is

I configured the network segment：

among them

[cr[……]

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How EIGRP publish static routes

The internet

In the EIGRP routing protocol，It does not seem to be able to issue commands directly to the default route，例如default-information originate

 

That should be how to do it? Here are two common methods：

one、Write a static default route，Then use the command to redistribute default route into EIGRP filling inside，Displaying such route entry for "D * EX" default administrative distance of 170；

 

two、Write a static default route，Then[……]

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OSPF link regional accreditation and certification (Port Authentication) difference

The internet

In the configuration in OSPF，There are portions of the content certification，OSPF authentication is divided into two，They are

  • Based authentication area
  • Based authentication link (port)

The same time，Authentication mode can also be divided into two，One is plain text authentication，Another is the MD5 encrypted authentication。

Here we do not discuss OSPF encryption method，It is simply illustrative ofRegional links and similarities and differences between these two types of authentication。

We agreed to a topology map，Probably like this

R1(s0 / 0)—–(s0 / 0)R2(s0 / 1)—-[……]

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OC: Optical Carrier Optical Carrier

Exchange of Experience The internet

OC standard fiber cable is commonly used in today's networks set of standards，Readily not hurt to look at memory。

Optical Carrier (OC) is determined at a level many SONET fiber optic network of a group of signal bandwidth。It is usually expressed as OC-n，among them，n is a multiplication factor，It indicates basic rate is 51.84 Mbit / s the number of times。Currently defined standards：
OC-1 — 51.8 4Mbit/s
OC-3 — 155.52 Mbit/s
OC-12 — 622.08 Mbit/s

[……]

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Yum install open source package management tool developers death due to accident

Linux

For all systems administrator，Today the news is quite regrettable。Open source command line package management tool developer of yum Seth Vidal when riding a bicycle was hit by a car and killed，Age of 36。Currently the driver still escape。

Yum(Full name Yellow dog Updater, Modified) Is anFedoraandRedHatas well asSUSE、CentOSThe front-end package manager Shell。based onRPMPackage Management，Can be automatically downloaded from the specified serverRPMAnd the installation package[……]

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That point out the thing ARP RARP Inverse ARP and DHCP between

The internet

How do network also has a year，Speaking today, a fewAgreement with "arp" in accordance withSome confused old，So I come here to be a simple distinction。

First, that ARP (address resolution protocol)：

This is not difficult to understand，arp protocol used in the computer artTao own MAC address and IP addressin the case of，It used to get the peer IP address corresponding to theMAC address。of course，MAC table of a switch is acquired from here，This is why you generally installed network，PING test of timeThe first package always MISS[……]

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Cisco ip helper-address 详解

The internet

Some time ago I wroteA simple example Cisco routers DHCP and DHCP relay configuration，Article uses a command to achieve theDHCP forwarding，But this function is exactly how to achieve it? Now let's learn more about this command。

When the terminal equipment andDHCP serverWhen not on the same broadcast domain，Intermediate devices need to specify an address to be broadcast packet forwarded out，That needs to be sethelper_addressTo achieve relay。

In fact，In the enterprise generally only need one or two DHCP servers to provide sufficient redundancy，complete[……]

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'Javac' is not an internal or external command solutions

Java Programming Development

These days began playing with a BlackBerry，Engineering mode，Java development environment is installed on the computer，But always after the installation prompts

'javac’ Not an internal or external command balabalabala ... ...

Google ~ solution：

  1. Right-computer--> Properties-> The left side of the "advanced system settings"-> The "Advanced" tab –> Under the "environment variables"
  2. System variables，Creates a new variable named JAVA_HOME，Variable values[……]

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Color tag cloud WordPress without a plugin

Wordpress

Off the grid is the default tag cloud tag cloud wp，Sizes，Color is actually very unified，This does not look very beautiful。

Is there any way to make it look better tag cloud? In fact, it is there，There are many plug-ins，All kinds，But for a tag cloud，Is again in the fast flip add a plugin seems quite wasteful。

So I found some simple ways to not use plug-in also implements the color tag cloud，This would seem better。

This is accomplished by such：

Edit the corresponding theme in the background functions.php[……]

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