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)
> >
> >
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> ****
>
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Received on Thu Aug 30 2012 - 09:22:47 ART