The MPLS-OPS Archive

[Carlos Patriawan <carlos@xebeo.com>]

Vishal M wrote:

> 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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I'm not sure if that would be an issue. First of all you can bundles
some or all FEC
in one packet so it doesn't consume lot of BW. Second, those messages
usually
only occured once unless you've lot of topology/routing changes.


Carlos




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