How a route to Null0 works in EIGRP?

http://www.siunetworks.com

Hello Roberto,

I have answered you by email.

Here is my explanation for any user also looking for this info

A null interface is basically a trash, whatever you send to a null interface is the same as dropping the traffic. You might be asking. Okey so why when I perform route summarization on an EIGRP router this route automatically gets created. Well Robert, the whole purpose of route summarization is basically to advertise a summary prefix to all or some specific neighbors based on our routing process information; so as we can see the summary should affect our neighbors not ourselfs, so this is why we point that. What the route says is basically: Do not install a route with this prefix, only installed more specific routes. Does it make sense? 

Kind regards

Jcarvaja

http://laguiadelnetworking.com

Tags: Cisco Security

Similar Questions

  • My Belkin router has stopped working. After talking to Belkin support, we got it to work, but I can't access the site of iiNet connection.

    original title: Wireless router problems

    My Belkin router has stopped working the other day, so I tried the usual stuff (turning on an etc) in the end rang Belkin and after about an hour the router started working again, but would go only on the iiNet connection site! Go figure, not even with them. The woman to the Belkin told me to ring my ISP I did, and they got me online, however, my printer, the laptop and the iPhone is no longer will connect wireless. They were all working perfectly before the router dropped out.

    I went through all the procedures that several times. Uninstalled and reinstalled the printer and the router... still does not work.

    The printer can not just to find the wireless network. The test report said that everything went except the SSID, which has been a FAILURE. How can this be when I haven't changed the

    SSID?

    I've updated as well.

    Hoping really frustrated, can someone help!
    Thanks in advance!

    Hello

    1 are there any changes or updates made on the computer before the show?

    2. What is the exact model of the router number?

    3. do you get an error message? If Yes, what is the full and exact error message?

    4. what operating system is installed on the computer?

    Method 1:

    Check the link and try to run the troubleshooter to check if it helps.

    Windows wireless and wired network connection problems

    http://Windows.Microsoft.com/en-us/Windows/help/wired-and-wireless-network-connection-problems-in-Windows

    Method 2:

    Check out the links and check if that helps:

    Solve problems, find wireless networks

    http://Windows.Microsoft.com/en-us/Windows-Vista/troubleshoot-problems-finding-wireless-networks

    The link applies to the Windows Vista and Windows 7 operating system.

    Problems of network with a router in Windows XP

    http://support.Microsoft.com/kb/315978

  • Brand new Dell 2808 router does not work.

    1. the 2808 is not connected to the internet.

    2. when it is received, the 2808 under tension with the disabled DHCP server and port active routing. It is the default setting. Not good to use normal, but worked as advertised. The DHCP server is usually needed in a small switch. I needed an active DHCP service.

    3. I've changed managed and connected fashion. A "saved to restore configuration screen" appeared. Horrible thing. Trashed the router. There is no saved configuration, the 2808 restarts. 2808 completely stopped working after that.

    4. after resetting 2808, the 2808 seemed no longer routing packets, so nothing works now with the exception of the web client, which does not seem to do anything for the networking.

    5 I did activate the DHCP client and configure the IP pool. However, no routed packets, nothing works. Port au port data routing does not work. The DHCP server is not required to allocate IP addresses.

    6. I paid 80 dollars to a so-called "Dell Customer Service" held to solve the problem. They have failed. It turns out that they did not know how to work the 2808.

    7 I have not understood how to contact customer service the Dell directly for the 2808. Not good. I bought a T7810 workstation in 2015 with 5 years of service from Dell, and I don't know how to contact Dell support technical support. I use the 2808 with the T7810. Both should be covered if the customer service could be found.

    8. bottom line, I bought the 2808 on July 27, 2016, and many hours later my effort and more hours of a consultant, I am frustrated trying to run home mode: a router 8-port 1000-baseTpacket with a DHCP Server enabled. I'm about to box 2808 router back to Amazon because it does not work and cannot be implemented.

    Any ideas?

    Thanks in advance to 1 million.

    Keith

    The simplest method to contact support is to enter the serial number on our support site.
    http://Dell.to/20VqlwQ The site will then list the various methods to contact support for this range of products.

    The 2808 PowerConnect doesn't have a console port, so recovery is somewhat limited. If the switch is on firmware version 1.0.0.38 or earlier, then a factory reset can be done by simply changing the transition from managed to not managed and then again. If the switch is on more recent firmware, however, this process does not reset the switch to factory default.

    Being a new switch, it should be under warranty. If the switch is not recoverable, support should be able to get a replacement sent to you.

  • I just installed an airport extreme router and WiFi works, but the status light still flashes.

    I just installed an airport extreme router and WiFi works, but the status light still flashes.

    Open airport utility... Click EI... and see what the cause of the problem. It will give the list of questions on the summary page. Click on each of them and he will offer you even solutions.

    for example the firmware needs to be updated... nothing major... or DNS is wrong or double NAT...

    Without our crystal ball, we do not know what is the issue.

  • Satellite X 200 - 21 l: how Windows Vista hot start work?

    Hello

    Does anyone know how hot Windows begin to work on Toshiba x 200-21 l?
    I can not configure it - and I don't know if it works on my laptop.

    Sven G

    Hello

    > I cannot configure it - and I don't know if it works on my laptop.
    I read about the Vista Hot start feature and it seems that the laptop manufacturers set up this hot start.
    Warm startup is related to multimedia keys Toshiba which lies at the top of the keyboard.
    To my knowledge, these buttons are already configured.

  • How my emergency phone call work

    How my emergency phone call work

    Google > https://www.google.com/search?q=iphone + emergency call +

  • NB100: How can I get ACPI working under XP

    Hello world

    I wonder how I can get ACPI working under XP.
    When I enable it in the BIOS, Windows will not start... Should I load the drivers during the installation of Windows XP? That would lead me to my next problem, because the command line switch - one for the extraction of the driver does not work... Does not extract the files either.

    Or y at - there a way to add ACPI to my XP install is already running (the BIOS ACPI option is currently set to "compatibility"?

    Thanks in advance!

    As far as I know before enabling ACPI in the BIOS, you must remove the standard PC driver in Device Manager and install the ACPI driver.
    Then go into the BIOS, turn it on and should start Windows.

    In the Microsoft Knowledge Base, I found an article on the ACPI Compatibility:
    http://support.Microsoft.com/kb/314088

  • Satellite P100-434 - Windows Vista - how to get Aero to work

    Hi does anyone know how to get Aero to work on my Tosh laptop. the OS is Vista Home Premium and I have exhausted the help options OS affecting theme Win Vista, color scheme to Aero etc.

    Hello

    The laptop should be certainly be able to use the AERO.
    It supports a 256 MB card and 2 GB memory graphics.

    So it seems you only need to activate the Aero on your Vista.
    But which version of Vista is installed on the laptop.
    As I know the basic home edition version does not include the Aero. The Aero is available on the Home Premium edition or newer

    So now you ask what you can do? I found these tips on the site of Ms.
    Check if the desktop theme has been set to Windows Vista

    1. open theme settings by clicking the Start button, clicking Control Panel, appearance and personalization, customization and then clicking theme.
    2. in the theme list, click Windows Vista, and then click OK.

    Try to enable transparency widowed intercadres.
    But note; to enable transparency, the color scheme must first be set to Windows Aero.
    1. open Personalization by clicking the Start button, clicking Control Panel configuration, on appearance and personalization, and then click customization.
    2. click on the appearance and color of the window.
    3. Select the transparency check box.

  • In my laptop, when I open the itunes window there is an option 'Internet Radio' to listen to the different type of music. This "Internet radio" function can be used on my iphone5? And if so, how can I make it work?

    In my laptop, when I open the itunes window there is an option 'Internet Radio' to listen to the different type of music. This "Internet Radio" function can be used on my iphone 5? And if so, how can I make it work?

    No more. It merged with the Apple's music.

  • Satellite L40-139 and WXP - how an audio device to work?

    I recently reinstalled Windows XP on my laptop and after having managed to download the drivers for my wifi video ect I arrived to the sound I have downloaded the driver but it still does not that my laptop doesn't show any recorded audio device. How can I make them work?

    That's what I see when I got to his http://i47.tinypic.com/25u04ds.jpg

    Hello

    On Windows XP, you must install the two updates for your sound card:
    AUDIO Patch1: Http://support.microsoft.com/kb/835221 KB835221
    AUDIO 2 Patch: KB888111 http://support.microsoft.com/kb/888111

    Alternative you can install SP3 because it contains these patches!

    But before installing, remove the current sound driver. The driver must be installed after Windows updates.

  • How to install Labview7 to work with win7(64bit)?

    How to install Labview7 to work with win7(64bit)?

    Try to install the Program Files (x 86) directory.

    But there is no guarantee that this will work because LV7 isn't officially compatible Win7.

  • How to disable the backup works when you print an email?

    How to disable the backup works when you print an email.  Whenever I try to print an e-mail, save it as a PDF is displayed.  I then have to save, then open the file to print.

    Hello

    Thanks for posting your query on the Microsoft Community.

    To disable this feature, you need to uninstall Adobe reader and then check if still back you the question quickly.

    Kind regards

    Jesinta Rozario

  • How does * (certificate-based authentication) work?

    How does * (certificate-based authentication) work?

    We do * in a company whose phones android and exchange 2010.

    We use the activesync to talk to Exchange via the SSL protocol.

    It works.

    I am documenting HOW it works (on a rather high level).

    I have some information, but would like to know what happens when exchange Gets the customer real auth cert of the device in the last part of the authentication process.

    Exchanges with impatience in its entirety to RFA, since AD (or its related PKI service) created the cert?

    Thank you.

    Mac

    This issue is beyond the scope of this site and must be placed on Technet or MSDN

    http://social.technet.Microsoft.com/forums/en-us/home

    http://social.msdn.Microsoft.com/forums/en-us/home

  • My Toshiba T110 has a keylock at the left rear. How is it supposed to work?

    Toshiba security lock,

    My Toshiba T110 has a keylock at the left rear. How is it supposed to work?

    Check with Toshiba support or the manual that came with your computer.

  • changed provider of wired broadband to another company offering wi - fi access. Outlook Express 10 stopped working. How can I make it work on a wi - fi connection?

    changed provider of wired broadband to another company offering wi - fi access. Outlook Express 10 stopped working. How can I make it work on a wi - fi connection?

    Hi JamesAthanassiou,

    What is the exact error message that you receive when you try to access Outlook Express 10?

    You can try to repair Outlook express and check if it helps:

    An Outlook Express basic repair kit

    Reference: OLEXP: Outlook Express stops responding and your pointer appears as an hourglass

    Hope the helps of information.

Maybe you are looking for