[c-nsp] Reliable static routes and 12.2S

[Rodney Dunn]

hmmm...maybe hook the object tracking code
in to BFD would be even better then.

On Mon, Jan 31, 2005 at 11:04:31PM +0100, Gert Doering wrote:
> Hi,
> 
> On Mon, Jan 31, 2005 at 04:52:41PM -0500, Rodney Dunn wrote:
> > On Mon, Jan 31, 2005 at 10:45:50PM +0100, Gert Doering wrote:
> > > > For a DSL type environment you usually are not running
> > > > a routing protocol over the links so what do you want
> > > > to react?
> > > 
> > > Link status (or being able to tie static routes into BFD).
> > That's the one part I was thinking about was static routes.
> > 
> > Link status is almost surely a no go.
> 
> Yes, understood.  This will make troubleshooting somewhat more difficult
> (you can't tell ops to look at "show interface ..." first, and only 
> if that's up/up go looking for more difficult problems - something which,
> for example, ATM OAMs nicely provide, if you have end-to-end ATM), but
> still, it would be *very* useful.
> 
> > > Just something to reliably notice that part of the "usual" something-
> > > bridged-over-something-without-end-to-end-keepalives customer links
> > > isn't working anymore, *without* having to run a full-featured routing
> > > protocol with the CPE.
> > 
> > With statics I can see it.
> > 
> > 
> > ie: default on the CPE with dial backup upon primary failure.
> 
> Yes, exactly this is the idea.  Right now we use ATM OAMs where possible,
> and where that is not possible, SAA probes with static routes (on Cisco
> gear) or even "if the line fails, pull out the ethernet cable so that
> the dial backup kicks in".
> 
> > Issue would probably become scalability.
> 
> In that scenario, we wouldn't run BFD in "millisecond failover" mode - 
> something like "10 seconds failure detection time" is perfectly fine...
> 
> gert
> 
> -- 
> USENET is *not* the non-clickable part of WWW!
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> Gert Doering - Munich, Germany                             gert at greenie.muc.de
> fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de