Re: MPLS over GRE

Hmm Thats wat i m thinking Brian. OTV alone cannot serve the purpose of
Mobility . U need underlying protocols to work with OTV :)
let me did deep into it and let u know my OTV pcap results.

On Thu, Aug 30, 2012 at 9:30 AM, Brian McGahan <bmcgahan_at_ine.com> wrote:

> OTV is just a layer 2 tunnel, it doesnt directly relate to the actual
> mobility. OTV will use IS-IS to advertise the MAC addresses just between
> the OTV edge routers. It doesnt advertise the MAC to IP mappings at all.
> You still need other protocols outside this scope to actually accomplish
> the mobility.****
>
> ** **
>
> Brian McGahan, CCIE #8593 (R&S/SP/Security)****
>
> bmcgahan_at_INE.com****
>
> ** **
>
> Internetwork Expert, Inc.****
>
> http://www.INE.com****
>
> ** **
>
> *From:* Routing Freak [mailto:routingfreak_at_gmail.com]
> *Sent:* Wednesday, August 29, 2012 8:53 PM
> *To:* Brian McGahan
> *Cc:* Cisco certification
>
> *Subject:* Re: MPLS over GRE****
>
> ** **
>
> Brian ****
>
> ** **
>
> When u r doing Seamless Mobility of MAC address, u r going to change the
> IP address assigned to a particular NIC to another NIC . So the basic thing
> is to inform others that the IP has been moved to a different machine or
> NIC right****
>
> So without all the voodoo magic , how does OTV helps in doing this****
>
> ** **
>
> G-ARP willl do the same thing when u seamlessly move ur IP to some other
> NIC in normal Ethernet circumstances. ****
>
> I feel OTV is used to counter this to communicate to others after moving
> seamlessly from one place to another using ISIS extended TLVs to advertise
> MAC address change with the IP Address which is doing the work of G-ARP***
> *
>
> ** **
>
> Am i right with my understanding ?****
>
> ** **
>
> ** **
>
> On Wed, Aug 29, 2012 at 10:50 AM, Brian McGahan <bmcgahan_at_ine.com> wrote:*
> ***
>
> Hi Routing Freak, ****
>
> ****
>
> See inline:****
>
> ****
>
> > Why OTV has this in built MPLS over GRE logic. ****
>
> ****
>
> The goal is Ethernet over IP, so Ethernet has to encapsulate in something.
> EoMPLS is already a standard so no need to rewrite the book. It's the same
> logic as AToM or VPLS. Likewise MPLS over GRE is already defined, so if you
> want to do L2 over L3 then why not do EoMPLSoGRE. This makes it transport
> agnostic, i.e. any IPv4 transport is sufficient. It seems convoluted but at
> the transport speeds its designed for the overhead is negligible.****
>
> ****
>
> > With L2 , u cant do multipath and also u cant move ur virtual machines
> seamlessly****
>
> ****
>
> Yes you can do multipath, with the most basic example being 802.3ad Port
> Channels (EtherChannel). More advanced multipathing would be vPC
> (Multi-Chassis EtherChannel), FabricPath (L2 IS-IS Routing), or TRILL when
> released.****
>
> ****
>
> > Can u give me some more examples for this Seamless Mobility with the
> same MAC Address.****
>
> ****
>
>
>
http://www.cisco.com/en/US/docs/solutions/Enterprise/Data_Center/DCI/4.0/EMC/
EMC_2.html
> ****
>
> ****
>
> > With normal L2, u cant do multipathing, u encapsulate L2 with L3 and do
> all sorts of magic what L3 gives u . but TRILL is also same as MPLS label
> switching or like OTV. Is there any logic behind this MPLS over GRE ? I
> dont see any logic for this ?****
>
> ****
>
> TRILL DCI is still in proposal (
> http://tools.ietf.org/html/draft-aldrin-trill-data-center-interconnect-00).
> OTV DCI works today and is implemented.****
>
> ****
>
> H8Rs gonna H8, but GRE is the ultimate band-aid of networking ;)****
>
> ****
>
> Brian McGahan, CCIE #8593 (R&S/SP/Security)****
>
> bmcgahan_at_INE.com****
>
> ****
>
> Internetwork Expert, Inc.****
>
> http://www.INE.com****
>
> ****
>
> *From:* Routing Freak [mailto:routingfreak_at_gmail.com]
> *Sent:* Tuesday, August 28, 2012 8:28 PM
> *To:* Bob Sinclair
> *Cc:* Brian McGahan; Cisco certification****
>
>
> *Subject:* Re: MPLS over GRE****
>
> ****
>
> Hi Brian****
>
> ****
>
> Why OTV has this in built MPLS over GRE logic. ****
>
> With L2 , u cant do multipath and also u cant move ur virtual machines
> seamlessly****
>
> Can u give me some more examples for this Seamless Mobility with the same
> MAC Address.****
>
> ****
>
> With normal L2, u cant do multipathing, u encapsulate L2 with L3 and do
> all sorts of magic what L3 gives u .****
>
> but TRILL is also same as MPLS label switching or like OTV. Is there any
> logic behind this MPLS over GRE ?****
>
> ****
>
> I dont see any logic for this ?****
>
> ****
>
> On Fri, Aug 24, 2012 at 3:41 AM, Bob Sinclair <bob_at_bobsinclair.net> wrote:
> ****
>
> Hi Brian,
>
> Just read your Blog post on this.
> (http://blog.ine.com/2012/08/17/otv-decoded-a-fancy-gre-tunnel/)
> Great Work! Thanks for sharing the captures.
>
> -Bob****
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of***
> *
>
> Brian McGahan
> Sent: Thursday, August 23, 2012 2:21 PM
> To: Craig Miller; Cisco certification; CCIE KID
> Subject: RE: MPLS over GRE
>
> Overlay Transport Virtualization (OTV) also uses MPLS over GRE:
> http://ine.co/otv
>
>
>
> Brian McGahan, CCIE #8593 (R&S/SP/Security) bmcgahan_at_INE.com
>
> Internetwork Expert, Inc.
> http://www.INE.com
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Craig Miller
> Sent: Thursday, August 23, 2012 11:17 AM
> To: Cisco certification; CCIE KID
> Subject: Re: MPLS over GRE
>
> I've never had to use it before, but I've considered it for some instances,
> and ended up going with other solutions. Where it would be useful, is
> connecting your MPLS network, across a non-MPLS network, or someone elses
> MPLS network.
>
> Bridging two PE routers, a P to PE router, two P routers. From a
> non-service
> provider perspective, if you have a need to run your own Enterprise MPLS
> network internally, you might have several remote sites that are connected
> to your network via a carrier MPLS, or maybe the remote site has just a
> normal internet pop. In both of those situations, probably more obvious to
> the remote site that has a normal internet pop, you can use a GRE solution,
> DMVPN etc, to establish a peer to peer session with your own
> infrastructure,
> from there, you can bridge your MPLS network over your carriers network, no
> matter what their infrastructure consist of.
>
> This could also be used in situations such as company mergers and such to
> maintain continuity while doing the migration.
>
> Hope that helps,
> Craig
>
> --- On Thu, 8/23/12, CCIE KID <eliteccie_at_gmail.com> wrote:
>
> > From: CCIE KID <eliteccie_at_gmail.com>
> > Subject: MPLS over GRE
> > To: "Cisco certification" <ccielab_at_groupstudy.com>
> > Date: Thursday, August 23, 2012, 9:28 AM Hi all
> >
> > I was going through some GRE use cases and i found that MPLS runs over
> > GRE.
> > I cant visualize any proper use case logic for this MPLS over GRE. And
> > that GRE is termed as soft GRE. Is there anyone who worked on MPLS
> > over GRE implementation. Where it is used extensively and how it is
> > been designed
> >
> > I can see that when SP is not offering MPLS services , then we can
> > tunnel over MPLs switched packets from ISP to other ISP over GRE where
> > the latter ISP support only IP and not MPLS . Is there any other
> > scenario or else any special use case for MPLS over GRE.
> >
> > Thanks in advance,
> >
> > --
> > With Warmest Regards,
> >
> > CCIE KID
> > CCIE#29992 (Security)
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > ______________________________________________________________________
> > _ Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
> ****
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 2012.0.2197 / Virus Database: 2437/5219 - Release Date: 08/23/12*
> ***
>
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
> ****
>
> ****
>
> ** **

Blogs and organic groups at http://www.ccie.net
Received on Thu Aug 30 2012 - 12:39:57 ART