Re: "send-label" and "mpls bgp fwd"

as far as implementation is considered mostly used on CSC scenarios and
Interproviders for end-to-end transport label.

the only-use case scenario is when you are running BGP/X-BGP between
directly adjacent routers. In any other case which involves more than
one-hop, you would again need MPLS for intermediate transport of
assigned-label.

http://tools.ietf.org/html/rfc3107 , has an overview where in it attempts
to describe the implementation.

On Sat, Jun 7, 2014 at 12:33 AM, GAURAV MADAN <gauravmadan1177_at_gmail.com>
wrote:

> After some more study ( basically i am simulating option B as of now) ; I
> find following :
>
> 1) When we are activating MP-ebgp (vpnv4) on the path that is not ldp
> enabled ; the command "mpls bgp fwd" get
> enabled automatically
>
> 2) When we are activating ipv4 ebgp by send-label command on the interface
> not running LDP ; the command "mpls bgp forwarding" get enabled
> automatically
>
> Some more work is needed on figuring out when and when not to be using
> send-label .
>
>
> On 6 June 2014 17:15, GAURAV MADAN <gauravmadan1177_at_gmail.com> wrote:
>
> > Hi Team
> >
> > Can some one point out to a good document / blog that help me understand
> > these 2 more clearly in IOS .
> >
> > What i understood :
> >
> > *mpls bgp fwd* :
> >
> > this is used in case of BGP+label and is generally automatically enabled
> > command. This is when we dont have LDP / RSVP running and we have to rely
> > on BGP for labels.
> > This is used in case of bgp in following cases for instance :
> >
> > r1 ------r2
> > lets say i am working for option b and i want to enable vpnv4 b/w r1 and
> > r2 , I n this case since i am expecting bgp + label between these 2 ; IOS
> > automatically enables command for me on interface joining r1 and r2
> >
> > *bgp send-label*
> >
> > As per me ; this again is used to build the transport label when we dont
> > have a LDP / RSVP to get us the labels.
> > But this can be in i-bgp or a e-bgp scenario .
> >
> > can someone please help me understand what is to be used where .
> >
> > Thanks in advance
>
>
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Received on Sat Jun 07 2014 - 08:12:09 ART