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LDP Hello and Keepalive intervals/holdtime

  • From: Vishal M <vishal_study@yahoo.com>
  • Date: Wed, 11 Dec 2002 11:35:46 -0800 (PST)
  • Resent-Date: Wed, 11 Dec 2002 16:20:50 -0500
  • To: mpls-ops@mplsrc.com


Hi,

According to RFC 3036, LDP Hello interval is 5 sec, KA
is 15 sec, Hello Holdtime is 15 sec and KA Holdtime is
40 sec.

If a LSR is acting in DU mode and has to deal with
large number of FECs (say 100k), the holdTimes of 15
(hello) and 40 (KA) is quite small and may result in
timeouts when LDP (and/or IP) modules of the LSR are
busy transmitting/receiving these large number of TCP
messages (i.e. FEC mappings).

Hence the operator may have to tune these holdtimers
to a higher number. 

Has anyone seen this kind of issue and would like to
share the experiences.

What is a *realistic* (or practical) value for
Hello/KA holdtimers (say given a gigabitEthernet kind
of interface) in ISP world ?

Could someone please comment on this.

Thanks for your time,

Regards,
Vishal.


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