From: steven.j.nelson@xxxxxx
Date: Thu Jul 11 2002 - 12:24:40 GMT-3
All
If you have a switch that will not bind the B channels dynamically you will
need two dialer maps to the same ip destination with different phone numbers
or (LDN's in the US), you will also need ppp multilink to form a single
"Virtual" channel, i.e no load balancing across two channels.
Colin
Are you based out of Tyneside ??
Thanks
Steve
-----Original Message-----
From: Jim Brown [mailto:Jim.Brown@caselogic.com]
Sent: 11 July 2002 15:46
To: 'Colin Barber'; 'ccielab@groupstudy.com'
Subject: RE: ISDN & ppp multilink things...
You don't need two dialer maps in the states when you are using SPIDs. I
think the issue is the simulator must be programmed to accept two calls for
one number. The Atlas has just such a switch in the configuration menu.
If it can only accept one call on a number, the second multilink call will
busy out.
-----Original Message-----
From: Colin Barber [mailto:Colin.Barber@telewest.co.uk]
Sent: Thursday, July 11, 2002 2:12 AM
To: 'ccielab@groupstudy.com'
Subject: RE: ISDN & ppp multilink things...
I also have never used two dialer map statements to the same destination,
that seems very strange! However in Europe we don't have any of this spids
rubbish, so I don't know if two maps are required then.
Colin
-----Original Message-----
From: Larson, Chris (Contractor) [mailto:Chris.Larson@ed.gov]
Sent: 10 July 2002 18:13
To: 'Tony Huang'; 'Dang Quang Minh'
Cc: 'ccielab@groupstudy.com'
Subject: RE: ISDN & ppp multilink things...
This is interesting, as I have seen this done with 2 dialer maps. I have
never had a need to use 2 dialer maps to bring up a second channel to the
same destination. Even if I have 2 spids. I just use the load threshold (w/
or w/o multilink) and when the threshold is crossed the BRI simply calls the
same number in the 1 dialer map and the second channel is brought up. I also
remeber when I had an ISDN modem at my desk you could call using voice the
one number and the analog port on the ISDN modem would light. If from
another phone you dialed the same number to the ISDN modem the second anolog
line would light (b channels). So in short I do not really think from what I
have seen that 2 dialer maps are necessary unless you sre dialing into a
different ISDN router.
comments.....
-----Original Message-----
From: Tony Huang [mailto:thuang@tdwaterhouse.com.au]
Sent: Monday, July 08, 2002 9:12 PM
To: 'Dang Quang Minh'
Cc: 'ccielab@groupstudy.com'
Subject: RE: ISDN & ppp multilink things...
If your isdn configured with two spids, you will have to employ two map
statements. For the isdn with only one number,but two channels without spid
support, you cannot use two maps but just one. By keying dialer threshold
you will be able to bring up a second channel provided the threshold is me.
Tony
-----Original Message-----
From: Dang Quang Minh [mailto:minhdq@saigonctt.com]
Sent: Tuesday, 9 July 2002 10:33 AM
To: 'Anthony Pace'; 'Carlos G Mendioroz'; 'Oliver Boehmer'
Cc: 'Groupstudy ccielab list'
Subject: RE: ISDN & ppp multilink things...
The ppp multilink command is used on ISDN interface to bundle both
64Kbps channels so they function together as 128kbps pipe.
The dialer load thres-hold command specidies how much traffic on the
first channel will force the second channel to be brought up. This
command take a numerical argument from 1 255. The number 1 is the
minimum load and the number 255 is a full load. Using this system, 128
would be approximately a 50% load.
So, if you use only one dialer map and you used load-threshold, you can
still bring up another BRI. If you use ppp multilink, you should use 2
dialer maps for two B channels and the load-threshold command.
HTH
Minh
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Anthony Pace
Sent: Tuesday, July 09, 2002 3:53 AM
To: Carlos G Mendioroz; Oliver Boehmer
Cc: Groupstudy ccielab list
Subject: Re: ISDN & ppp multilink things...
So if only one dial map existed and you used "load-threshold", would it
bring up another BRI and put every other PPP frame onto each of the 2
BRI's?
Or would you need 2 dial maps?
If you use PPP multilink, then is it best to use the same generic
"load-threshold" command or the PPP multilink version of the command?
I would think that PPP multilink puts traffic accross the links in some
very low level or bit level load balancing. Is that the difference
between using "load-threshold" without multilink and "PPP multilink"?
Anthony Pace
On Sat, 29 Jun 2002 17:49:58 -0300, "Carlos G Mendioroz"
<tron@huapi.ba.ar> said:
> Oliver Boehmer wrote:
> >
> > At 14:59 29.06.2002 -0300, Carlos G Mendioroz wrote:
> > >Hi,
> > >just going over ISDN things, some I have not been able to clarify:
> > >
> > >-using load-threshold, you can bring 2 (or more?) B channels into
> > >a link using ppp but without ppp multilink. What's the protocol
used
> > >then ?
> >
> > None, it's basically standard load-sharing over multiple, parallel
links.
> > There are no such things as interleaving or fragmentation without
PPP
> > multilink, though..
>
> This is not standard, as you got only one layer3 interface (bri0/0 in
my
> case)
> and only one fib entry. There must be some protocol controling this...
> Also, the balancing is done packet by packet, even though I have not
> disabled
> fast switching...
>
> >
> > >-when MPP is used, a virtual-access interface is created and the
info on
> > >seconds left and seconds idle from "show isdn active" vanishes...
> > >How do you see that info ?
> >
> > Hmm, which IOS are you using? Try "show caller" or "show caller
timeout"..
> >
> Nope,
> 12.1.13
> Idle time is gone from there too:
>
> #sh caller
> Active Idle
> Line User Service Time Time
> con 0 - TTY 03:16:11 00:00:00
> BR0/0:1 2602 PPP 00:00:16 -
> #sh isdn act
>
------------------------------------------------------------------------
--------
> ISDN ACTIVE CALLS
>
------------------------------------------------------------------------
--------
> Call Calling Called Remote Seconds Seconds Seconds
> Charges
> Type Number Number Name Used Left Idle
> Units/Currency
>
------------------------------------------------------------------------
--------
> In +ne number> ---N/A--- 2602 91 - -
>
------------------------------------------------------------------------
--------
>
>
>
> > oli
>
>
> --
> Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
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