From: Roberto Iannuzzi (twinturbos@xxxxxxxxxxxx)
Date: Thu Nov 29 2001 - 02:52:31 GMT-3
X:
Router B should have the following dialer-maps:
dialer map ip 1.0.0.1 remote-name A broadcast 2222
dialer map ip 1.0.0.1 remote-name A broadcast 3333
You are mapping 1 64k channel to 2222 at the Physical Layer
You are mapping 1 64k channel to 3333 at the Physical Layer
Router B can now dial both 64K lines to connect to Router A.
The Routers will load balance between the 2 64K lines.
"Dialer map" maps the IP address to the phone number that the local Router
is dialing at the Network Layer.
Think of the BRI channel like a regular telephone line in that it is a
switched network. When you call someone on the telephone you pick up the
phone and dial a number. The router does the same thing in that it dials a
particular number and it is up to the phone co. to make sure that their
switches can channel that number correctly.
How it happens:
Router B first sees interesting traffic(unless it is a permanent ISDN
conx...Uncommon) and then it dials the phone number in its dialer map let's
say 2222. The dialer map tells Router B at the end of this phone number 2222
is Router A at Ip Address 1.0.0.1 and you should let "broadcasts" through so
routing updates and such get propogated.
Hope this helps,
Regards,
--Roberto
----- Original Message -----
From: "X C" <xjchen@altavista.net>
To: "afiddler" <afiddler@wi.rr.com>
Cc: <ccielab@groupstudy.com>
Sent: Thursday, November 29, 2001 12:18 AM
Subject: Re: What's the relationship between BRI channel and telephone
number
> Thanks for reply.
>
> So let's say I have router A and B, A has BRI0 with IP address 1.0.0.1,
and telephone numbers 2222 and 3333 to two channel respectively. On router
B, is the following configuration ok?
>
> interface bri0
> ip address 1.0.0.2 255.255.255.0
> dialer-group 1
> encapsulation ppp
> ppp authentication chap
> dialer map ip 1.0.0.1 remote-name A broadcast 2222
> dialer map ip 1.0.0.1 remote-name B broadcast 3333
> !
> dialer-list 1 protocol ip permit
>
> Thanks,
> X
> ----
> Each B channel is associated with a separate phone number, which is
included
> in the SPID (assuming you are in an area that supports SPIDs). There are
> two phone numbers if there are two B channels.
>
> You would use a separate dialer map for each destination you want to call,
> such as a hub and two spokes.
>
> This information and much much more is on CCO. Check it out!
>
> http://www.cisco.com/warp/public/471/#isdn
>
> ----- Original Message -----
> From: "X C" <xjchen@altavista.net>
> To: <ccielab@groupstudy.com>
> Sent: Wednesday, November 28, 2001 2:38 PM
> Subject: ISDN: What's the relationship between BRI channel and telephone
> number
>
>
> > Hi,
> >
> > I'm confused on the BRI channel and telephone number, I know we have two
> BRI channels, usually we use one number for two channels, right?
> >
> > But could we have one telephone number for each channel? If yes, how
> should we config, should we have one dialer map for each number we would
> call?
> >
> > Thanks,
> > X
> > --
> >
> --
>
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