endpoint liveness (RE: Do ATM-based Exchange Points make sense an ymore?)

Sat Aug 10 09:13:33 UTC 2002

It makes little sense to detect transient glitches.  Any possible reaction 
on those glitches (i.e. withdrawal of exterior routes with subsequent 
reinstatement) is more damaging than the glitches themselves.

--vadim

On Fri, 9 Aug 2002, Lane Patterson wrote:

> 
> BGP keepalive/hold timers are configurable even down to granularity 
> of link or PVC level keepalives, but for session stability reasons, 
> it appears that most ISPs at GigE exchanges choose not to
> tweak them down from the defaults.  IIRC, Juniper is 30/90 and Cisco is
> 60/180.  My gut feel was that even something like 10/30 would be 
> reasonable, but nobody seems compelled that this is much of an
> issue.
> 
> Cheers,
> -Lane
> 
> -----Original Message-----
> From: Petri Helenius [mailto:pete at he.iki.fi]
> Sent: Friday, August 09, 2002 3:07 PM
> To: Mikael Abrahamsson; nanog at merit.edu
> Subject: Re: Do ATM-based Exchange Points make sense anymore?
> 
> 
> 
> 
> > What functionality does PVC give you that the ethernet VLAN does not?
> >
> That╢s quite easy. Endpoint liveness. A IPv4 host on a VLAN has no idea
> if the guy on the "other end" died until the BGP timer expires.
> 
> FR has LMI, ATM has OAM. (and ILMI)
> 
> Pete
> 