From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Wed Mar 09 2005 - 14:18:51 GMT-3
Question A Answer:
By default, a dialer interface is treated as a point-to-point link.
This is similar to a point-to-point subinterface with Frame Relay where
you only need to apply the layer 2 address (frame-relay interface-dlci
<dlci>) to the sub interface and all layer 3 addresses map to the single
layer 2 address. With a dialer interface all layer 3 addresses map to
the single layer 2 address (dialer string).
Question B Answer:
This will depend on your ISDN switch configuration. You can normally
tell if you need one or two numbers by the information given. You can
also test this by using the ISDN test call command and see what is
required to connect both B channels.
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Andrea Zanetti
Sent: Tuesday, March 08, 2005 11:40 PM
To: 'Group Study'
Subject: Dialer interface question x 2
Hi group,
I cannot understand how dialer interfaces map to broadcasts, and what is
the difference in having one or two numbers on BRI interfaces or dialer
interfaces.
-Question A
When dialer map statements are configured under bri interfaces, the
broadcast keyword tells the machine to send (pseudo)broadcast on the
dial up connection.
On the contrary, when using dialer interfaces with dial string only (one
or two numbers), I cannot see anything that tells the machine whether or
not to send broadcasts on the connection.
-Question B
Sometimes in BRI configuration with multilink PPP only one telephone
number is used.
Sometimes two, one for each B channel. Why? How can I tell if I have to
use one or two?
I know these are very basic questions, but I would appreciate your
comments.
Thanks to everybody
Andrea
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