[c-nsp] OSPF fast hellos

[Frank Bulk]

If you can get BFD support worked into the 3750ME, we wouldn't have to mess
with OSPF fast hellos. =)

Frank

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Rodney Dunn
Sent: Thursday, October 30, 2008 12:30 PM
To: Ben Steele
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] OSPF fast hellos

On Thu, Oct 30, 2008 at 08:06:36AM +1030, Ben Steele wrote:
> Because I couldn't see bfd support for 3750's, best it can do is UDLD,
> otherwise that would be my preferred method.
>
> Are you advising against fast hello's?

No totally.

 Have you seen many issues with people
> using them?

Yes. They have to be scheduled on the CPU as a process and that is more
variable because IOS is run to completion, except for psuedo preemption
added for BFD.

Even that isn't 100% bullet proof but it's better than OSPF fast hellos
from that perspective.



>
> -----Original Message-----
> From: Rodney Dunn [mailto:rodunn at cisco.com]
> Sent: Wednesday, 29 October 2008 11:41 PM
> To: Ben Steele
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] OSPF fast hellos
>
> Why don't you use BFD instead. It's designed with something called
> pseudo preemption from an OS scheduler perspective that helps
> reduce false positives and the fact that BFD frames are handled
> under interrupt and not process scheduled for rx/tx.
>
> Rodney
>
> On Wed, Oct 29, 2008 at 04:09:45PM +1030, Ben Steele wrote:
> > Anyone currently using this in a fairly demanding environment? Ie
5-10Gbs+
> > Campus/DC model.
> >
> >
> >
> > Curious as to whether you've had any/many false dead peers with such a
> short
> > interval, subsecond dead peer detection does sound very temping though.
> >
> >
> >
> > Cheers
> >
> >
> >
> > Ben
> >
> >
> >
> >
> >
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