Cisco to ISDN
Scott Bursing
I was wondering if anyone has any information on ISDN, how it works and
how the 3000 platform handles it, also, any configuration information
would be helpful. We are looking at establishing an ISDN connection
but have no experience with it.
Any help would be much appreciated.
Scott Bursing
Network Manager
Fingerhut Companies
Phone: 612-945-4011
Fax: 6123-945-4023
Email: scott....@seag.fingerhut.com
Dave Morton
>> ISDN line onto you home for those people in the UK interested in these
>> things..
Excuse me while I say J*s*s. DBP Telekom will install basic rate for
DM 65. That's like UKP 22 approx. Monthly DM 78 and normal telephone
charges. Seems a little steep what BT are asking....special offer huh ?
More to the point - ciscos with ISDN are what's been needed here in DE for
years. Thanks to cisco for getting it going.
Dave
,
Pasvorn Boonmark
> Scott Bursing wrote....
> >
> >
> > I was wondering if anyone has any information on ISDN, how it works and
> > how the 3000 platform handles it, also, any configuration information
> > would be helpful. We are looking at establishing an ISDN connection
> > but have no experience with it.
> >
>
> Several people here have asked me to look at providing ISDN connections for
> IPX and ISDN
> - do I need to get an ISDN connection for each possible user of the system ?
> [like I would for a modem-pool ?]
> or
> - does it multiplex like X.25
>
> How easy is it to configure ISDN support in a cisco router ?
>
> Richard
>
> PS British telecom currently have a special offer of 200UKP to install an
> ISDN line onto you home for those people in the UK interested in these
> things..
>
> -------------------------------------------------------------------------------
> Network Manager mail: R.J....@salford.ac.uk
> University of Salford phone: +44 61 745 5252
> Great Britain fax: +44 61 745 5888
>
The following is an example of a 3103 (1E/1BRI) router. I will
also put some comment in the configuration.
Basically, the following router connect to a Northern Telecom's
DMS-100 switch. The SPID for my station is 415988488501, and
415988488602. These numbers were configure on the switch and
will be given to you by the telco. The 9884885 and 9884886 are
regular phone numbers for the two channels. Please note that
the "isdn spid1 .." and "isdn spid2 .." commands are not
required for AT&T switch.
The next required command is the "dialer-group 1", but the
number "1" could be any number from 1-99. This is required
because it is used to define "interesting" packet types. An
interesting packet is a packet that will activate the dialing
sequence and will resset the "idle-timeout" timer. This can
be done by defines an access-list and to tie the access-list
to a dialer-group using "dialer X list Y" command- where X
is the dialer-group's number, and Y is tne access-list number.
The following section is an example of how to tie these
commands together:
interface BRI 0
dialer-group 1
!
access-list 101 permit icmp 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255
access-list 101 permit tcp 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255
access-list 101 permit udp 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255
dialer-list 1 LIST 101
This example, I define the interface BRI 0 to be in dialer-group 1.
Then I specify that any ICMPs, TCPs, and UDPs packets going out
of the BRI interface will activate the dialing sequence.
The next thing to do is to map between the next-hop address
and the phone number that the router would dial to. This
can be done by using "dialer map ip" command. This command
is not necessary if you only will dial to only one router.
If you would not use the "dialer map ip" command, you will
have to use "dialer-string". In the following example
configuration, I put both of the commands in there.
An important note: if you would have multiple routers to
call each other, you would have to use PPP encapsulation
with CHAP authentication on the line. This is recommend
sothat the routers would be able to know which routers
it talks to at any time. The required configuration
for this part is as follow:
interface BRI 0
encapsulation PPP
ip address 131.108.157.2 255.255.255.0
ppp authenticate chap
dialer map ip 131.108.157.1 name isdn2 4883
!
username isdn2 password stanFord
In this example, we use PPP with CHAP and the remote
router that we will talk to is 131.108.157.1, the
remote router's name is "isdn2". The secret word
between the two routers is "stanFord". Please note
that in the real configuration on the router, the
secret word "stanFord" will be encrypted. Obviously,
you will have to define (assume that this router is
"isnd1":
username isdn1 password stanFord
in the remote router. The phone number of the "isdn2"
router is 4883. If you don't want this router to
dial out, you could put the following command:
dialer map ip 131.108.157.1 name isdn2
If you have any question, please let me know.
-Pasvorn
-------------------------- Cut Here ----------------------
version 9.1
!
hostname isdn1
!
enable-password XX
service tcp-keepalives-out
service timestamps
!
boot system flash
!
!
buffers middle max-free 100
!
!
!
!
!
!
isdn switch-type basic-dms100
!
interface Ethernet 0
ip address 131.108.64.190 255.255.255.0
no mop enabled
!
interface BRI 0
encapsulation PPP
ip address 131.108.157.2 255.255.255.0
isdn spid1 415988488501 9884885
isdn spid2 415988488602 9884886
ppp authenticate chap
dialer idle-timeout 300
dialer string 4883
dialer map IP 131.108.157.1 name isdn2 4883
dialer-group 1
!
!
router ospf 1
network 131.108.64.0 0.0.0.255 area 0.0.0.0
!
router igrp 109
distribute-list 10 in
network 131.108.0.0
neighbor 131.108.157.1
passive-interface BRI0
!
ip route 131.108.0.0 255.255.0.0 131.108.19.0
ip route 131.108.19.0 255.255.255.0 131.108.64.1
!
!
!
!
!
!
access-list 1 permit 192.0.254.0 0.0.0.255
access-list 1 permit 131.108.0.0 0.0.255.255
access-list 10 permit 131.108.128.0 0.0.127.0
access-list 101 permit icmp 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255
access-list 101 permit tcp 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255
access-list 101 permit udp 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255
dialer-list 1 LIST 101
banner motd
Please shut int B 0 off when not in-use.
username isdn1 password 7 11120F175804
username isdn2 password 7 02450D480A09
!
!
line vty 0 4
login
line con 0
exec-timeout 0 0
line aux 0
no exec
line vty 0
exec-timeout 0 0
password XX
line vty 1
exec-timeout 0 0
password XX
line vty 2
exec-timeout 0 0
password XX
line vty 3
exec-timeout 0 0
password XX
line vty 4
exec-timeout 0 0
password XX
!
end