DMPVN Dual Hub Configuration

In the DMVPN design guide it is stated that in a dual hub configuration one hub should be set as the primary via EIGRP metrics. Is there a reason for this? Why can't both routes act as successors so that load-balancing can take place. The only thing I can think of is that it could cause problems with spoke-to-spoke communication.
Can someone shed some light on this?

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DMVPN DUAL HUB SINGLE CLOUD CONFIGURATION EXAMPLE

Hi,
I am looking for a simple configuration for a dmvpn network running eigrp with two hubs on a single cloud.
Do i just create two nhs entries, nhrp map entries, and two multicast entries on the spoke router tunnel interfaces? And on the hub routers add a delay on the tunnel interfaces for the one i prefer to be the secondary?
I am looking for confirmation and any other tweaks i need to make. i cant seem to find any examples.
Thanks in advance!!

Thanks Paul, I have looked over this design guide as this was the fist place i went. however, i cannot find a configuration example for dual hub/single cloud.
i see the high level design and know you can do it. but it doesnt show what the configuration would look like...unless i am just reading over it.
Thanks

Configuration Dual HUB Dual Dmvpn

Hi Dears
i configurate simple DMVPN on my network. Now i want to configurate Dual HUB Dual DMVPN.
i can not find any good configuration documentation how config that.
please provide me a link or any pdf fot configuration DUal HUB Dual Dmvpn .
thanks.

Thanks Paul, I have looked over this design guide as this was the fist place i went. however, i cannot find a configuration example for dual hub/single cloud.
i see the high level design and know you can do it. but it doesnt show what the configuration would look like...unless i am just reading over it.
Thanks

Different between Dual hub-dual DMVPN cloud Vs Dual hub-single DMVPN cloud

please explain
different between Dual hub-dual DMVPN cloud Vs Dual hub-single DMVPN cloud

Thanks Paul, I have looked over this design guide as this was the fist place i went. however, i cannot find a configuration example for dual hub/single cloud.
i see the high level design and know you can do it. but it doesnt show what the configuration would look like...unless i am just reading over it.
Thanks

Dual hub with one hub :-S

Hi,i know the title is absurde .
that is my topology :
there are two links between router R1 (Hub) and router R4 (ISP) :
The primary DMVPN cloud should be with the primary link (150.0.0.0/24)
The secondary DMVPN cloud should be with the secondary link (150.0.1.0/24)
the HUB must have one tunnel interfaces for each physical interface,so we need two tunnel interfaces .
If i choose Dual hub dual dmvpn cloud that mean that i must have two tunnel interfaces for each spoke.
If i choose Dual hub single dmvpn cloud that mean that i must have just one tunnel interface for each spoke.
the Hub must always use the primary link,to reach spokes1 (we are in the primary DMVPN cloud).
but if the primary link goes down the second must be used by the hub and we move to the second DMVPN cloud .
the ISP should use the secondary link only if the primary is down .
a default route should be configured on the ISP to reach Internet.
Is this possible (correct) ?,if yes :
which model is the best : dual hub dual dmvpn cloud or dual hub single dmvpn cloud?
how can i configure the ISP to use the secondary link only if the primary is down?
if we have two hubs,how/why the spokes prefer the primary hub?
in this situation: how the spokes will prefer the primary DMVPN cloud (the primary Link)?

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Dual-DMVPN Design with Dual Hubs on a single router ??

Hi All,
In DMVPN, in Dual-DMVPN Design with Dual Hubs , can a single router perform the role of dual hubs.
The router has two different internet links. It is intended that when one link goes down, spokes shud connect to the same router onto the other active internet connection. Is this possible ?

Since no one has answered yet, I'll give you the practical answer.
You'll have issues with IPSec and static routing. "DMVPN" itself probably wouldn't have an issue, but it would depend on IPSec and routing to work.
It is easier, by far, to put in a second router. And when you factor in your time to try to make it work (and it may not work), the second router is less expensive.
Rob

Dual screen configuration makes keyboard stop working on X

Hi. My computer is working just fine. And my video card has two outputs (Nvidia[GeForce 9600 GT] (rev a1)). I got a second monitor, and I was trying to configure Xorg to use the two of them in a dual screen configuration.
I tried creating the 10-monitors.conf file like described in https://wiki.archlinux.org/index.php/NV … e_monitors, and here is what happens. X does use the two monitors, and I can even see my mouse pointer moving from one to the other. But then my keyboard stops working, and so do the mouse keys, only moving the mouse around works.
I have the impression this is related to the missing InputDevices in the ServerLayout. Something in my configuration probably needs that still, if the ServerLayout gets explicitly configured. What should I do? Could this be related to HAL somehow? How do I turn off HAL without it trying to kill me?
Thanks.

I have been using nvidia's TwinView for a long time, currently with two different monitor sizes. There is no need to do anything with udev if you have your xorg.conf set up properly. Here's what mine looks like, though you will have to adapt it according to your hardware.
Section "ServerLayout"
Identifier "Dual Layout"
Screen "Screen0"
EndSection
Section "ServerFlags"
Option "AutoAddDevices" "on"
Option "AutoEnableDevices" "on"
Option "AllowEmptyInput" "on"
EndSection
Section "Monitor"
Identifier "Acer"
HorizSync 30-81
VertRefresh 56-76
EndSection
Section "Device"
Identifier "GeForce 210"
Driver "nvidia"
Option "NvAGP" "3"
Option "NoLogo" "1"
Option "RenderAccel" "true"
Option "AddARGBGLXVisuals" "true"
Option "TwinView" "true"
Option "SecondMonitorHorizSync" "24-70"
Option "SecondMonitorVertRefresh" "56-75"
Option "MetaModes" "1680x1050, 1600x900 @1600x900"
Option "TwinViewOrientation" "RightOf"
Option "WrappedFB" "true"
EndSection
Section "Extensions"
Option "Composite" "true"
EndSection
Section "Screen"
Identifier "Screen0"
Device "GeForce 210"
Monitor "Acer"
DefaultDepth 24
Subsection "Display"
Depth 24
Modes "1680x1050" "1600x900"
ViewPort 0 0
EndSubsection
EndSection
It is best to let as much as possible be handled automatically, but getting two screens working properly requires a bit of tweaking.

Dual cloud dual hub single tier dmvpn with backup service provider

Hi,
I have a design issue with a WAN network. I have decided to use dual cloud dual hub single tier DMVPN topology (ref. to http://www.cisco.com/application/pdf/en/us/guest/netsol/ns171/c649/ccmigration_09186a008075ea98.pdf - "Dynamic Multipoint VPN (DMVPN) Design Guide"). I have tested in lab 2 hubs and 3 spokes, applying the mentioned technology. Everything is OK, when the primary hub fails, there is only 1-3 seconds loss (3 pings).
The problem is that each spoke and hub will have 2 service providers for WAN - primary and backup. I am still wondering which design is better and more stable to implement - using more DMVPN clouds (for the backup service provider network) or creating static IPSEC GRE tunnels in the backup links?
Is there a guide for this case?
What is the best practice in this case?
Thanks in advance,
Mladen

Dynamic spoke-to-spoke requires your spoke routers to have mGRE tunnel interfaces. If you ever have a spoke which sources 2 tunnels from the same physical interface, you have a problem: how to resolve which tunnel is an incoming NHRP request for?
My DMVPN is a bit different in that the crypto is GETVPN on the physical interface. There is a crypto-map applied to the physical interface and it has 2 entries which correspond to the GETVPN crypto-groups for each tunnel.
I resolved this issue by making one of the 2 tunnels on each spoke router mGRE and the 2nd one point to point. the mGRE tunnel is preferred as primary (we use eBGP through the tunnel, so routes received through the mGRE tunnel are local-pref'd high and we AS path prepend routes advertised out the point-to-point tunnel)
I haven't gone back and tested what happens when you have a spoke which has 2 tunnels sourced from the same interface and another spoke with 2 tunnels sourced from the same interface or from 2 different physical interfaces. The concern is that you may get a situation where one router uses Tunnel 2 for dynamic spoke-to-spoke tunneling, and the other uses Tunnel1, and that the dynamic tunnel setup fails because the crypto map cannot properly decide which crypto group to use for the incoming traffic on the router where 2 tunnels use the same physical interface.

What is a dual port configuration?

Hi!!!
I have a doubt while reading about some features of MPLS equipment! In many of them it appears that it allows a dual-port configuration, which rises the availability offered by the provider. My questions are:
- A dual port configuration is between the PE and the CE of the customer?
- Does the dual port configuration mean that you have two cables connecting the two equipment in order the principal one breaks??
Thanks in advance!
Alain

Hi,
I have not heard this term in MPLS. But I assume dual port means you have one physical link
connecting between PE to CE and you divide it in two parts (based on vlan if it is ethernet or based on dlci value if it is
serial link) and configure both port (part of one physical link) with two different vrf. Sp that link configured under one vrf will not talk to another link configured under another vrf.
If you share more details of where you read this and for which product..so that people here can have more ideas to share.
Regards
Mahesh

Setting up independant dual-head configuration in the usual way?

I'm preparing to set up a dual monitor system pretty soon using an ATI Radeon card. I went through the wiki and read what the ATI page has to say:
Independent dual-headed setups can be configured the usual way
The problem is that it gives no indication of what the usual way is. I vaguely have an idea that I might need xinerama, but couldn't find a wiki page on that either... I've also tried googling with limited results.
Is anyone able to let me know of a good resource for this?
Last edited by phunni (2011-12-26 20:15:38)

Check this out: https://wiki.archlinux.org/index.php/Xorg
I'm using a radeon 6870 with kde and in my case I was able to set up my dual screens using Settings > System Settings > Hardware > Display and Monitor > Size & Orientation, clicking Save as Default once I had things set up the way I wanted made the settings permanent
If you're going to use Ati's catalyst control center driver then you should probably also read this page: https://wiki.archlinux.org/index.php/ATI_Catalyst

Controlling resolution on dual monitor configurations

We have a situation where we use a screen capture process that is having trouble when someone plugs in a dual monitor to a Macbook (Air, I think, but it applies elsewhere). The resolution on the external monitor ends up being higher than our screen capture device can handle, and causes it to crash.
Is there a way to control or limit the resolution of the monitor(s) in (and out of) dual configuration?
Thank you.

I have a question about compatibility of monitors of different resolution. Currently I have an iMac 24 inch set to the maximum resolution 1920 x 1200. My second monitor is a large Hewlett-Packard which is currently set at resolution 1050 x 1680. It can be set as high as 1344 x 1008. If I move the Hewlett-Packard to another resolution I get the message that the input signal is out of range and asked me to return it to the setting 1050 x 1680.
Now to my question: I am considering getting the 27 inch iMac which has a maximum resolution of 2560 x 1440. My question is am I going to be able to use a 27 inch screen with the Hewlett-Packard second monitor without turning down the resolution on the 27 inch iMac? By the way the Hewlett-Packard monitor is a W2207H. Is the HP monitor going to work with that much difference in resolution?
I apologize if this is a naïve question but I just want to make sure that if I do upgrade I will not lose the services of my second monitor.
Thanks
Jim

DMVPN dual hub - qos preclasify limitation

Hi,
Reading the DMVPN design guide I found: "qos pre-classify is not supported in an architecture that implements two different headends for mGRE tunnels and VPN tunnels."
http://www.cisco.com/application/pdf/en/us/guest/netsol/ns171/c649/ccmigration_09186a008075ea98.pdf
Currently i am using a single headed DMVPN design with qos preclasify configured on the hub and voice works just perfect. My concern is with regards to implementing a secondary hub for redundancy. How will the qos be handled if the qos preclasify is not supported?
Thanks,

I'm not aware of any limiation if you're using two separate tunnel interfaces (as opposed to two NHRP mappings on a single tunnel interface).
Nor does:
http://www.cisco.com/en/US/docs/ios-xml/ios/sec_conn_dmvpn/configuration/15-2mt/sec-conn-dmvpn-per-tunnel-qos.html#GUID-182BD32F-56D4-479C-BFEF-B9738291E046
mention any.
If in doubt, please open a TAC case.

Dual display configuration

what is needed from a hardware stand point to configure a2 headed system, not a mirrored externl display?

Hi,
From a hardware point of view, an exernal monitor and possibly an adapter to plug it in are the only thing required (apart from the computer!)
The trick to getting a double moniter system, rather than a mirrored one it to download a firmware updater. Below is a link to a webpage that will help you do this (you'll need to scroll down to the bit that's called 'Dual Screen' or similar).
There are also some other articles there that may be of interest to you.
Best of luck
Chris
http://www.lbodnar.dsl.pipex.com/eMac/eMac-upgrade.html

[ASR1K] ISG Dual Stack configuration

Hello
Is it possible to configure l3-connected ISG dual stack on ASR1000?

Hi,
According to document http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/isg/configuration/xe-3s/asr1000/isg-xe-3s-asr1000-book/isg-ipv6.html, it is possible:
Restrictions for ISG IPv6 Support
Layer 2 connected interfaces are not supported. Only Layer 3 routed in-band IPv6 sessions are supported.
Session Coexistence on ISG Interfaces
The following session combinations can exist on the same ISG interface in Cisco IOS XE Release 3.5S and later releases:
Native IPv6 and native IPv4 sessions
Regards

Usb hub configuration

ive just got a macbook.
it has one firewire port and two usb ports. ive bought a belkin firewire hub so i can plug two firewire device in.
and now im looking in to buying a usb hub so i can plug in my external hard drive, my keyboard (mouse will plug into that), my scanner and my printer.
is there a perfect configuration of these devices?
ive been told that plugging the external HD directly into the mac would be best but i can only do that if the keyboard (and therefore mouse as well) plug into the hub. and i worry that might cause conflict issues...
any advice on this?
the perfect solution seems to be to get a bluetooth wireless keyboard and mouse... but is there anything i can do without having to spend more money!
thanks

wob wrote:
ive just got a macbook.
it has one firewire port and two usb ports. ive bought a belkin firewire hub so i can plug two firewire device in.
and now im looking in to buying a usb hub so i can plug in my external hard drive, my keyboard (mouse will plug into that), my scanner and my printer.
is there a perfect configuration of these devices?
ive been told that plugging the external HD directly into the mac would be best but i can only do that if the keyboard (and therefore mouse as well) plug into the hub. and i worry that might cause conflict issues...
any advice on this?
the perfect solution seems to be to get a bluetooth wireless keyboard and mouse... but is there anything i can do without having to spend more money!
Any time that your hub is spending with low-speed (1.5Mbit/sec) USB devices (keyboard or mouse) is bandwidth that isn't going to your high-speed devices on the same hub. If at all possible, keep low-speed devices off the same main port as your high-speed devices.

DMPVN Dual Hub Configuration

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