[c-nsp] UDLD - why is default 60 seconds?

[Hank Nussbacher]

On Thu, 23 Feb 2006, Anthony Ryan wrote:

With a default of 60 seconds, convergence would be at the speed of BGP
rather than OSPF.  -Hank

>
>
> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net
> > [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Hank
> > Nussbacher
> > Sent: 23 February 2006 16:32
> > To: cisco-nsp at puck.nether.net
> > Subject: [c-nsp] UDLD - why is default 60 seconds?
> >
> > <http://www.cisco.com/en/US/products/hw/routers/ps368/products
> > _configuration_guide_chapter09186a0080160ecf.html>
> >
> > Why is the default probe message time 60 seconds and in
> > addition one can only go as low as 7 seconds?  If a GE port
> > suddenly becomes unidirectional, I would like to know about
> > in 1-2 seconds and not after 7 seconds, so that the link is
> > forced down and OSPF turns to an alternate path.  Or am I
> > missing something?
>
> Is there a danger of false positives and links being detected as down
> when they are really OK if UDLD doesn’t give them a bit of a chance ?
>
> A bit like OSPF allows for a few hello packets to go missing
> to avoid unnecessary routing changes unless 4 go missing
> one after the other perhaps.
>
> Anthony
>
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