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

Anthony Ryan anthony.ryan at manchester.ac.uk
Thu Feb 23 11:51:16 EST 2006

> -----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.


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