From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Thu Jul 29 2004 - 20:25:52 GMT-3
Tim,
The router will sample the load at the configured interval
(default 5 minutes). When that interval starts however is not known to
you on the CLI. So when you mention that "the second circuit comes up
in a few seconds" it is just by coincidence that you happened to
generate traffic just before the load was sampled.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987 x 705
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> ccie2be
> Sent: Thursday, July 29, 2004 5:45 PM
> To: Brian McGahan; Wang Dehong-DWANG1; Kenneth Wygand; Daniel Sheedy
> Cc: ccielab@groupstudy.com
> Subject: Re: Dialer load threshhold & load-interval interaction
>
> So, why doesn't it take much longer, by default, for the 2nd circuit
to
> kick
> in?
>
> If the load-threshold value is relatively small, say 10%, the second
> circuit
> comes up in a few seconds - not anywhere near 5 minutes. And, this is
> just
> from doing pings which stop very quickly.
>
> Although this is probably outside the scope of the lab, it would be
good
> to
> really understand just how the router is calculating the load and know
for
> how long traffic has to exceed the load-threshold before the 3nd
circuit
> comes up.
>
> Is there any way this can be determined?
>
> Thanks, Tim
> ----- Original Message -----
> From: "Brian McGahan" <bmcgahan@internetworkexpert.com>
> To: "ccie2be" <ccie2be@nyc.rr.com>; "Wang Dehong-DWANG1"
> <Dehong.Wang@motorola.com>; "Kenneth Wygand"
<KWygand@customonline.com>;
> "Daniel Sheedy" <dansheedy@gmx.net>
> Cc: <ccielab@groupstudy.com>
> Sent: Thursday, July 29, 2004 6:32 PM
> Subject: RE: Dialer load threshhold & load-interval interaction
>
>
> What it means is the load average over load-interval seconds.
> By default the load of the interface is a five minute average.
Setting
> load-interval to 60 seconds would make it a 1 minute average.
>
> HTH,
>
> Brian McGahan, CCIE #8593
> bmcgahan@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987 x 705
> Outside US: 775-826-4344 x 705
> 24/7 Support: http://forum.internetworkexpert.com
> Live Chat: http://www.internetworkexpert.com/chat/
>
>
> > -----Original Message-----
> > From: ccie2be [mailto:ccie2be@nyc.rr.com]
> > Sent: Thursday, July 29, 2004 5:30 PM
> > To: Wang Dehong-DWANG1; Kenneth Wygand; Daniel Sheedy; Brian McGahan
> > Cc: ccielab@groupstudy.com
> > Subject: Re: Dialer load threshhold & load-interval interaction
> >
> > Does anybody know if the load-interval command affects the load
> > calculation
> > used by the dialer load-threshold command?
> >
> > The smallest value possible with the load-interval command is 30
> seconds.
> > Does that mean that after dialer load-threshold has brought up the
> second
> > bri circuit, it will take at least 30 of the load being less than
the
> > threshold before load-threshold will take down the 2nd bri?
> >
> > Also, it seems that dialer load-threshold kick-ins very quickly
after
> the
> > load exceeds the load threshold value. How does the router
determine,
> by
> > default, for how long the load must exceed load-threshold before
> kicking
> > in?
> >
> > In other words, suppose the load exceeds the load threshold for only
3
> > seconds, will the 2nd circuit be brought up?
> >
> > How 'bout 5 seconds? etc?
> >
> > Thanks in advance
> >
> >
> > ----- Original Message -----
> > From: "Wang Dehong-DWANG1" <Dehong.Wang@motorola.com>
> > To: "'ccie2be'" <ccie2be@nyc.rr.com>; "Kenneth Wygand"
> > <KWygand@customonline.com>; "Daniel Sheedy" <dansheedy@gmx.net>;
"Wang
> > Dehong-DWANG1" <Dehong.Wang@motorola.com>; "Brian McGahan"
> > <bmcgahan@internetworkexpert.com>
> > Cc: <ccielab@groupstudy.com>
> > Sent: Thursday, July 29, 2004 5:59 PM
> > Subject: RE: Dialer load threshhold vs. ppp multilink
> >
> >
> > >
> > > I felt the same way after I looked at doc CD..
> > >
> > > Usage Guidelines
> > > When the cumulative load of all UP links (a number n) exceeds the
> load
> > threshold the dialer adds an extra link and when the cumulative load
> of
> > all
> > UP links minus one (n - 1) is at or below load threshold then the
> dialer
> > can
> > bring down that one link. The dialer will make additional calls or
> drop
> > links as necessary but will never interrupt an existing call to
> another
> > destination
> > >
> > >
> >
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/
> fd
> > ial_r/drfd.htm#wp1123269
> > >
> > > -----Original Message-----
> > > From: ccie2be [mailto:ccie2be@nyc.rr.com]
> > > Sent: Thursday, July 29, 2004 4:49 PM
> > > To: Kenneth Wygand; Daniel Sheedy; Wang Dehong-DWANG1; Brian
McGahan
> > > Cc: ccielab@groupstudy.com
> > > Subject: Re: Dialer load threshhold vs. ppp multilink
> > >
> > >
> > > Dan,
> > >
> > > I believe you're mistaken. Dialer load-threshold will also drop a
> > channel
> > > if the load remains below the load-threshold long enough.
Remember,
> the
> > > period during which the load is evaluated is determined by the
> dialer
> > > interval-period which, by default, uses 300 seconds (5 minutes).
> > >
> > > Does anybody disagree?
> > >
> > > But, on the other hand, it doesn't take 5 minutes for utilization
to
> > exceed
> > > the load-threshold for the 2nd channel to be added. Go figure.
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: "Daniel Sheedy" <dansheedy@gmx.net>
> > > To: "Wang Dehong-DWANG1" <Dehong.Wang@motorola.com>
> > > Cc: <ccielab@groupstudy.com>
> > > Sent: Thursday, July 29, 2004 4:08 PM
> > > Subject: Re: Dialer load threshhold vs. ppp multilink
> > >
> > >
> > > > Hi Dehong,
> > > >
> > > > I was looking through the commands and found this one about
number
> 3.
> > > >
> > > > Use the ppp multilink load-threshold command for dynamic
bandwidth
> > > > (dial-on-demand) systems in which MLP will need to dial
additional
> > links
> > > as
> > > > needed to increase the bandwidth of a connection. When the load
on
> the
> > > > bundle interface exceeds the set value, links are added. When
the
> load
> > on
> > > > the bundle interface drops below the set value, links are
dropped.
> > > >
> > > >
> > >
> >
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/
> di
> > al_r/dia_n1g.htm#wp1135540
> > > >
> > > > So, if the questions asks that the link should add the link at a
> > certain
> > > > load, and then remove it when it drops down below this level,
then
> the
> > > > multilink load-threshold is the way to go. Whereas the dialer
> load
> > will
> > > > just add it, and then timeout when it is bored (has nothing
> > interesting).
> > > >
> > > > Dan Sheedy
> > > >
> > > >
> > > > _______________________
> > > > Subject: RE: Dialer load threshhold vs. ppp multilink
> > > >
> > > >
> > > > > good to know the more details. I thought that load threshold
and
> > > multilink
> > > > are bond together too :) Now my question is what should be used
if
> you
> > are
> > > > just asked to bring the second link up if the traffic on first
> channel
> > > > exceed some point, say 70%.
> > > > >
> > > > > 1. load threshold only
> > > > > 2. load threshold with ppp multilink
> > > > > 3. ppp multlink load threshold
> > > > >
> > > > > thanks.
> > > > >
> > > > > - Dehong
> > > >
> > > >
> >
>
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