From: Jim Phillipo (jim.phillipo@guardent.com)
Date: Mon Jul 28 2003 - 23:45:52 GMT-3
Here are the configs. R2 will bring up the link when it pings R2. R1 will
connect but not be able to ping (unless a dialer-group is added)
If I add the dialer-group it will work fine (even without the phone number
in the map command)
hostname R1
!
username R2 password 0 nmc
!
isdn switch-type basic-ni
!
interface BRI0
ip address 172.16.12.1 255.255.255.0
encapsulation ppp
ip ospf demand-circuit
dialer map ip 172.16.12.2 name R2
dialer-group 1
isdn switch-type basic-ni
isdn spid1 5101 8995101
isdn spid2 5102 8995102
no peer neighbor-route
ppp authentication chap
!
show dialer map on R1 (Static dialer map ip 172.16.12.2 name R2 () on BR0)
!
!
hostname R2
!
username R1 password 0 nmc
!
interface BRI0
ip address 172.16.12.2 255.255.255.0
encapsulation ppp
ip ospf demand-circuit
dialer map ip 172.16.12.1 name R1 broadcast 8995101
dialer map ip 172.16.12.1 name R1 broadcast 8995102
dialer-group 1
isdn switch-type basic-ni
isdn spid1 5201 8995201
isdn spid2 5202 8995202
no peer neighbor-route
ppp authentication chap
!
dialer-list 1 protocol ip permit
-----Original Message-----
From: donny.mateo@sg.ca-indosuez.com
[mailto:donny.mateo@sg.ca-indosuez.com]
Sent: Monday, July 28, 2003 10:38 PM
To: ccielab@groupstudy.com
Cc: ccielab@groupstudy.com; nobody@groupstudy.com
Subject: Re: ISDN Question
First of all, Dialer-group and dialer-list is not the one who trigger the
call. They are used to tell the router which traffic is interesting and to
keep dialer-idle timout refresh so the isdn line won't be disconnected as
long as those traffic exist.
Once you have an interesting traffic, your router needs to know where to
route the traffic. (you can use whatever method, static floating, dialer
watch etc). Now that the router has a next-hop address, dialer-map comes
into play by mapping the next-hop
addres to the ISDN circuit.
I got a few setup with only one side having dialer-string and no there has
been no problem so far. There was even a case when only one end is having
dialer-list and dialer string, and the other has nothing just a definition
of the dialer. Of course the
line would get disconnected every 300 seconds by the router that has no
dialer-group (since it dont' see any reason why it should keep it up since
there is no interesting traffic anyway and naturally idle-timeout would
disconnect the line).
Try to change it using the new form of dialer configuration and get rid of
the dialer-map. Your problem is you are using dialer-map with no number. So
when the called router try to put the packet to ISDN frame it will fail ( it
got no number to refer to),
you won't get into this problem is you're using dialer string.
<calling router>
hostname calling
int dialer 1
encap ppp
ip addr 1.1.1.1 255.255.255.252
dialer pool 1
dialer-group 1
dialer remote-name called
dialer string x.x.x.x
exit
dialer-list 1 protocol ip permit
<called router>
hostname called
int dialer 1
encap ppp
ip addr 1.1.1.2 255.255.255.252
dialer pool 1
dialer-group 1
dialer remote-name calling
exit
dialer-list 1 protocl ip permit
Donny
Jim Phillipo
<jim.phillipo@gua To:
ccielab@groupstudy.com
rdent.com> cc:
"'brian@cyscoexpert.com'" <brian@cyscoexpert.com>, (bcc: Donny
Sent by:
MATEO/ADPC/ASIA/BANQUE_INDOSUEZ/FR)
nobody@groupstudy Subject: ISDN Question
.com
07/29/2003 10:04
AM
Please respond to
Jim Phillipo
I was always under the ASSUMPTION that the dialer group and dilaer list were
only for bringing up the link (interesting traffic). I am working on a lab
that requires only one side to make a call.
Until I put the dialer commands on the called router it would not work. I
would connect but I would get the dreaded encapsulation failed message.
Is this the correct operation ?
I did have my dialer map on the called router with the dial number left out.
TIA
JIm
Jim Phillipo, CCNP, CCDP
Sr. Internetworking Engineer
W: 401.456.1821 F: 401.456.0599 M: 508.982.8923
90 Royal Little Drive, Providence, RI 02904
www.guardent.com
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