Re: BFD confusion

Hemanth,

1. Discriminator fields are used to uniquely identify multiple BFD sessions
between the same pair or sessions w.r.t Multiaccess networks. I hope i
needn't explain multiplexing and demultiplexing.

2. BFD runs on top of the [ UDP+IP+L2 ]

3. BFD is generally specified under an interface and hence will take the
primary ip add of the interface.
It doesn't form adjacency like the hello protocols used in ospf/eigrp but
generally works based on echoing.The source and dest ip would be the same
but L2 address would be of the neighbor.

You may also tie the BFD process with the existing routing protocol too.

Sorry if it sounds confusing but Implementation w.r.t BFD mode always
depends ;)

Best Regards,
Tharak Abraham Luke

On Fri, Jul 1, 2011 at 1:04 PM, HEMANTH RAJ <hemanthrj_at_gmail.com> wrote:

> Hi guys
> I am reading BFD RFC and i am not able to get some points in it
>
> 1. What is the use of Discriminator field in BFD Control ?. It says it is
> used to demultiplex control plane packets to their neighbor . i cant
> understand what is called as demultiplex control plane packets to the
> neighbors
>
> 2. BFD works on which layer . Is it a Layer 2 encapsulation or L3
> encapsulation . or it s a L2.5 encapsulation.
>
> 3. Which address that BFD uses to communicate with its neighbor? RFC says
> it
> is application specific and i am not getting the point exactly ?
>
>
> Can some one shed some light on it ?
>
>
>
> --
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> Yours Friendly,
> H P HEMANTH RAJ
> CCIE#28593 (R&S)
> Cisco Systems
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Received on Fri Jul 01 2011 - 15:07:48 ART