The MPLS WG Archive

[Shahram Davari <Shahram_Davari@pmc-sierra.com>]

Sure, but then what is your fault detection time scale, and how do you measure availability SLA?

-Shahram

> -----Original Message-----
> From: Thomas D. Nadeau [mailto:tnadeau@cisco.com]
> Sent: Thursday, March 21, 2002 11:17 AM
> To: Shahram Davari
> Cc: 'George Swallow'; 'mpls@uu.net'
> Subject: RE: Y.1711 requirements from IETF 
> 
> 
> 
>          Well, you MAY LSP ping all of those FECs if you wish and at
> whatever rate you (i.e.: an operator) feels comfortable with. No one
> is "strongly suggesting" that you do so at 1 packet per second.
> 
>          --Tom
> 
> 
> >But the same is true for MPLS-ping. You also need to ping 
> all those FECs.
> >
> >-Shahram
> >
> > > -----Original Message-----
> > > From: George Swallow [mailto:swallow@cisco.com]
> > > Sent: Wednesday, March 20, 2002 5:59 PM
> > > To: Shahram Davari
> > > Cc: 'Thomas D. Nadeau'; 'mpls@uu.net'; swallow@cisco.com
> > > Subject: Re: Y.1711 requirements from IETF
> > >
> > >
> > > > Where did you get this " ALL LSPs MUST" statement from? May
> > > be you are
> > > > reading a different Y.1711 than I have. All I can find are
> > > the following
> > > > statement:
> > > >
> > > > " ... It is strongly recommended that CV OAM packets be
> > > generated on all LSPs
> > > > (in order to detect all defects and potentially provide
> > > protection against
> > > > traffic leakage both in and out of LSPs). "
> > >
> > > I have one customer providing an IP VPN service who has >1500 PE
> > > routers and probably well over a million LSPs.  Most of the LSPs
> > > represent VPN connectivity can carry very little traffic.
> > >
> > > Would you "strongly recommend" that CV OAM packets be 
> generated on all
> > > their LSPs at a rate of 1 per second?  Can you point to *any*
> > > currently deployed network other than those using MPLS solely for
> > > traffic engineering where this would be a good idea?  If 
> I'm carrying
> > > the full internet routing table and using LDP downstream 
> unsolicited
> > > should every router generate 108,000 (the current number 
> of routes) CV
> > > OAM packets per second?
> > >
> > > Perhaps you should revisit this "strongly recommended"
> > > recommendation.  Perhaps you should provide for 
> generation of CV OAM
> > > packets at rates other than 1  second.
> > >
> > > ...George
> > >
> > > ==================================================================
> > > George Swallow       Cisco Systems                  (978) 497-8143
> > >                      250 Apollo Drive
> > >                      Chelmsford, Ma 01824
> > >
> 
> 
> 
> --------------------------------------------------------------
> ----------
> Mathematics is the supreme nostalgia of our time. 
>