From: P729 (p729@xxxxxxx)
Date: Sat Jun 29 2002 - 22:41:47 GMT-3
Ah, I see the point of confusion. The teardown threshold is referenced to
the bandwidth of the primary link only. What is measured and compared to the
reference is the moving average of the aggregate of the combined links.
So to clarify your example, when you say you want to drop the BRI when the
"traffic drops below 64K," we need to know if it's 64K across the aggregate
or roughly 64K through the primary interface only. If 64K across the
aggregate, then the _former_ of your two examples ('backup load 50 25')
would apply. The average data rate on the primary interface would be roughly
43K when the BRI drops.
If you meant roughly 64K through the primary when the BRI drops, then the
command would be more like 'backup load 50 38.' The simple ratio between the
primary and backup interfaces is 2:1, so you would want the line to drop
when the aggregate load is 96K, which is approximately 38% of 256K.
Sorry about the confusion. (~sigh, I'm not doing too well today...)
Regards,
Mas Kato
https://ecardfile.com/id/mkato
----- Original Message -----
From: "Colin Barber" <Colin.Barber@telewest.co.uk>
To: <ccielab@groupstudy.com>
Sent: Saturday, June 29, 2002 3:34 PM
Subject: RE: Backup load command
> It's also documented as the first - see link below
>
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/dial
> _r/drdrab.htm#1018574
>
> I guess I will have to test it.
>
> Regards,
> Colin.
>
> -----Original Message-----
> From: P729 [mailto:p729@cox.net]
> Sent: 29 June 2002 23:22
> To: Colin Barber; ccielab@groupstudy.com
> Subject: Re: Backup load command
>
>
> It's supposed to be the latter--the backup link is torn down when the load
> of the _combined_ links drops below the threshold. It's documented as such
> and others have confirmed it, but I have to admit, I've never empirically
> tested it.
>
> Regards,
>
> Mas Kato
> https://ecardfile.com/id/mkato
> ----- Original Message -----
> From: "Colin Barber" <Colin.Barber@telewest.co.uk>
> To: <ccielab@groupstudy.com>
> Sent: Saturday, June 29, 2002 1:56 PM
> Subject: Backup load command
>
>
> > I have been reading conflicting information regarding the backup load
> > command. The second parameter to specify when to bring down the backup
> > interface is either
> >
> > load % of primary interface
> > load % of combined primary and backup interface
> >
> > for example if you have a serial interface running at 256K. You want to
> > bring up a 128K BRI if the load reaches 128K and terminate the BRI when
> > traffic drops below 64K. Is the command
> > backup load 50 25 or backup load 50 17
> >
> > Colin
> >
>
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