[50817] in North American Network Operators' Group
Re: endpoint liveness (RE: Do ATM-based Exchange Points make sense
daemon@ATHENA.MIT.EDU (Vadim Antonov)
Sat Aug 10 05:14:19 2002
Date: Sat, 10 Aug 2002 02:13:33 -0700 (PDT)
From: Vadim Antonov <avg@exigengroup.com>
To: Lane Patterson <lpatterson@equinix.com>
Cc: <nanog@merit.edu>
In-Reply-To: <4FA6CECCC8A3D41186F700B0D0784FF40242E685@hq-exchange.corp.equinix.com>
Errors-To: owner-nanog-outgoing@merit.edu
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@he.iki.fi]
> Sent: Friday, August 09, 2002 3:07 PM
> To: Mikael Abrahamsson; nanog@merit.edu
> Subject: Re: Do ATM-based Exchange Points make sense anymore?
>
>
>
>
> > What functionality does PVC give you that the ethernet VLAN does not?
> >
> Thatīs 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
>
