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Cell Relay Retreat>MPLS-OPS Archive>month:2002-Dec> msg00124



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Re: LDP Hello and Keepalive intervals/holdtime

  • From: Carlos Patriawan <carlos@xebeo.com>
  • Date: Fri, 13 Dec 2002 09:53:45 -0500
  • Organization: Xebeo Communications
  • Resent-Date: Fri, 13 Dec 2002 11:24:51 -0500
  • To: Vishal M <vishal_study@yahoo.com>, mpls-ops@mplsrc.com


Vishal M wrote:

> If an LSR receives a Hello (UDP pkts), it restarts
> just the Hello HoldTimer (and not the Session
> holdTimer).
> However if it receives a KA or any LDP message i.e.
> Mapping/Withdraw/Release (TCP pkts), it restarts the
> Session HoldTimer (and not Hello holdtimer).
>
> My question was if an LSR is busy trying to propagate
> Label Mapping (of 50k Fecs) to a number of peers, it
> might time out on receiving Hello or KA messages (if
> the timeouts are defaulted to RFC 3036).

Have you ever really simulated  this condition (50K FECs label mapping)
?
If LSR has 4 ldp peers then it has to retain 200k label binding due to
liberal retention mode.

I'm wondering what boxes that you're using ? maybe you'll hit internal
software limitation before even reaching that number. :)

Carlos




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