From: Fake Name (fname84@gmail.com)
Date: Tue Jan 13 2009 - 20:29:23 ARST
Well for a simple deployment of 4 routers one at each site I would like to
hear ppls views what solution is better?
If I make router1 the hub and 3 spokes then use rip or ospf if they are
running eigrp on the mpls then it will be pretty easy to configure correct?
All i need to do is do my dmvpn config and enable the routing protocol. It
will learn the same routers it knows via eigrp with a higher AD so they
won't be put in the routing table. if at any point any of thethe eigrp
neighbors go down and they lose routes from prefered eigrp ad then the other
backup routers will be installed in the table for the respective routers
that had the mpls failure...I will not be doing redistribution into the
respective routing protocols. can anyone see any issues with this
configuration listed above?
If i where to configure it the other way and do a single eigrp process for
dmvpn and mpls I would put on the tunnel interfaces a higher bandwith and
set the variance command under the routing process so they are not unequal
cost load balanced. again if a single mpls neighbor relationship went down
eigrp would already have a backup path and switch over faster. Can anyone
see any issues with this configuration?
Point of view time which one do you think is better?
On Tue, Jan 13, 2009 at 1:02 PM, Luan Nguyen <luan@netcraftsmen.net> wrote:
> With these designs, you need to take a look at your existing addressing
> scheme, your connection profile: like is it going to be one router or 2
> routers (one for dmvpn and one for mpls), any downstream router to make the
> selection...etc
> Summarization, for most of the time, won't be an option at all.
> If you look at requirements like if one MPLS site goes down, will you
> activate all DMVPN circuits or just for that site? Then you have to make
> sure you don't have asymmetric routing going on, internet connection at
> each
> site? At central site?
> Lots of things to consider...definitely not a breeze in any account.
>
> Regards,
>
> Luan Nguyen
> Chesapeake NetCraftsmen, LLC.
> [W] http://www.netcraftsmen.net
> [M] luan@netcraftsmen.net
> [Blog] http://cnc-networksecurity.blogspot.com/
>
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Piyoush Sharma
> Sent: Tuesday, January 13, 2009 12:38 PM
> To: Joseph Brunner
> Cc: Cisco certification
> Subject: Re: DMVPN question
>
> Another (not zero-touch though) design is, if you use BGP on MPLS, setup
> iBGP on your dmvpn and let an IGP like OSPF handle the best path
> selection.
>
> Dump routes from dmvpn and mpls into the local site's IGP and the mpls
> would
> be preferred, if mpls goes down, the routes from dmvpn would be preferred..
> I prefer to summarize all major subnets on the mpls and dmvpn. it limits
> the
> routing table size and if you use correct tags, troubleshooting is a
> breeze..
>
> On Tue, Jan 13, 2009 at 8:47 AM, Joseph Brunner
> <joe@affirmedsystems.com>wrote:
>
> > We actually like to do longer prefixes known via mpls and less specific
> > ones
> > know via the dmvpn...
> >
> > So 10.1.10.0/24 would be learned on mpls while
> >
> > 10.1.0.0/16 would be learned (as the backup) on dmvpn
> >
> > -Joe
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Fake
> > Name
> > Sent: Tuesday, January 13, 2009 11:00 AM
> > To: Cisco certification
> > Subject: DMVPN question
> >
> > If I want to use dmvpn to be a backup for the already existing mpls
> network
> > where each location has a connection to the internet and mpls connections
> > to
> > eachother what is the best practice? Would it be configuring dmvpn and
> > using the same routing protocol instance between everything and playing
> > with
> > the metrics to make sure traffic is going over the mpls network and not
> the
> > dmvpn when its up and when it does down to use the dmvpn backup? Or
> would
> > it be using another routing protocol for the dmvpn network with a higher
> > administrative distance so that routes dont go in the table till the mpls
> > network is down?
> >
> > Please offer some advice on best practices?
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
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> _______________________________________________________________________
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