From: Daniel Cisco Group Study (danielcgs@imc.net.au)
Date: Wed May 28 2003 - 07:46:27 GMT-3
Brian,
When does the 2nd channel drop? How is the relevant load values & thresholds calculated?
Daniel
-----Original Message-----
From: Brian Dennis [mailto:brian@labforge.com]
Sent: Wednesday, 28 May 2003 17:26
To: 'Nguyen Hoang Long'; ccielab@groupstudy.com
Subject: RE: Dialer load-threshold question
But to answer your question the load is based off 64kbps so the
load-threshold should be set to 128 for 32kbps (50% utilization).
As a side note not all ISDN connections are 64kbps per B channel. ISDN
can be 56kbps per B channel.
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Nguyen Hoang Long
Sent: Tuesday, May 27, 2003 10:21 PM
To: Songbin Wei; Jonathan V Hays; ccielab@groupstudy.com
Cc: Danny.Andaluz@triaton-na.com; Brian Dennis
Subject: Re: Dialer load-threshold question
IPExpert uses 64, not 128.
Hi Brian,
can you explain a bit more
Thanks
Long
----- Original Message -----
From: "Songbin Wei" <sbwei_2000@yahoo.com>
To: "Jonathan V Hays" <jhays@jtan.com>; <ccielab@groupstudy.com>
Cc: <Danny.Andaluz@triaton-na.com>
Sent: Wednesday, May 28, 2003 3:11 AM
Subject: RE: Dialer load-threshold question
> IOS measures load using the following formula:
>
> load = (average rate in one load-interval)/bandwidth
>
> where load-interval and bandwidth are configurable.
> For BRI interface, the default bandwidth is 64kbps.
>
> If the requirement is 'bring up the 2nd channel when
> the first channel's load reaches 50%', that means when
> load reahes 32kbps, with the default bandwidth config
> (64kbps), we have
> load = 32/64 = 0.5
>
> so the load threshold is 128.
>
> If somehow the bandwidth was changed to 128kbps, then
> load = 32/128 = 0.25
> and the load-threshold should be 64. But this
> situation is not common.
>
> It's always good to verify the bandwidth by typing
> 'show int bri' in the lab.
>
> --- Jonathan V Hays <jhays@jtan.com> wrote:
> > You are right that it does not specify 64Kbps. But
> > common sense tells us
> > that if the second channel is not yet connected, IOS
> > must be monitoring
> > the load only on the first channel. I would say that
> > the answer is that
> > "dialer load-threshold" load on a B channel is
> > always based on 64 Kbps.
> >
> > HTH
> >
> >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com
> > [mailto:nobody@groupstudy.com] On
> > > Behalf Of Danny.Andaluz@triaton-na.com
> > > Sent: Monday, May 26, 2003 7:16 PM
> > > To: ccielab@groupstudy.com
> > > Subject: Dialer load-threshold question
> > >
> > >
> > > Hello, Group. On BRI interfaces is the dialer
> > load threshold
> > > based on 1 B channel at 64k or 2 at 128k?
> > >
> > > interface bri0
> > > dialer load-threshold 128 either
> > >
> > > I would think with the above, if the first b
> > channel reaches
> > > half of the max capacity, then it should dial up
> > the second
> > > channel. This is the way I have always configured
> > it on
> > > production routers. It seems to work correctly
> > when tested
> > > with pings to the remote BRI.
> > >
> > > I looked at the ISDN sections on the doc CD on the
> > website
> > > and there is nothing definitive there.
> > >
> > > Thanks,
> > > Danny
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