[c-nsp] question about BFD

[Gert Doering]

Hi,

On Wed, Jan 04, 2006 at 03:11:10PM -0800, Srividya Rao wrote:
> -          Does BFD notify its clients (registered protocols like
> OSPF/ISIS) when a link comes up? If it does, what value does that hold
> in the protocol's context? Every protocol has its own hello mechanism
> wherein it not only recognizes its neighbors, but also exchanges some
> protocol-specific information. Hence, does BFD's notification add any
> value?

>From what I understand, the main value of BFD is not "tell the router
when a link comes up" but "make sure the router will notice quickly
when a link *goes down*" (on links unlike SDH/SONET that don't properly
do this in the link layer) so routing protocols don't need to rely on
hello timers timing out to start failover.

gert
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de