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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
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<title>Cisco - Configuring BRI Backup Interface with Dialer Profiles</title>
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<br>This configuration uses a BRI circuit to backup a serial link. It also
uses the Open Shortest Path First (OSPF) routing protocol between the two
routers. Once the backup connection is activated, you must ensure that
the routing table is updated to use the new backup link. Only one side
(maui-soho-01) is configured to dial out. The other side (maui-nas-05)
is configured to accept the call.
<p>In this configuration we have a Cisco 1604 router connected to a Cisco
3640 router using a serial connection. Both routers are also equipped with
BRI interfaces that will be used for the backup link. The Cisco 1604 is
running Cisco IOS<sup>®</sup> Software Release 12.1(5)T and the Cisco
3640 is using Cisco IOS 12.1(2).
<p><b>Note</b>: Configure and verify that the DDR connection (dialer 1
with BRI0) is working properly before you configure the <b>backup interface</b>
and <b>backup delay</b> commands. This will allow you to effectively manage
troubleshooting dialer profiles, ISDN, Point-to-Point Protocol (PPP) and
authentication issues before you configure the backup.
<br>
<table BORDER CELLPADDING=3 WIDTH="80%" BGCOLOR="#FFFFFF" valign="TOP" >
<tr BGCOLOR="#CCCCFF">
<th><b>maui-soho-01 (1600)</b></th>
</tr>
<tr>
<td HEIGHT="1486">
<pre>maui-soho-01#<b>show running-config
</b>Building configuration...
Current configuration : 1687 bytes
!
version 12.1
no service single-slot-reload-enable
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname maui-soho-01
!
logging rate-limit console 10 except errors
aaa new-model
aaa authentication login default local
aaa authentication login NO_AUTHEN none
aaa authentication ppp default local
<i><font color="#3333FF">!--- basic AAA configuration for ppp calls
</font></i>enable secret 5 <deleted>
!
username maui-nas-05 password 0 cisco
<i><font color="#3333FF">!--- username for remote router (maui-nas-05) and
shared secret
!---(used for CHAP authentication)
!--- shared secret must be the same on both sides
</font></i>ip subnet-zero
no ip finger
!
isdn switch-type basic-ni
!
interface Loopback0
ip address 172.17.1.1 255.255.255.0
<i><font color="#3333FF">!--- The loopback address will be used by OSPF for the
router ID.
</font></i>!
interface Ethernet0
ip address 172.16.1.1 255.255.255.0
!
interface Serial0
<i><font color="#3333FF">!--- Primary Interface
</font></i> backup delay 10 30
<i><font color="#3333FF">!--- Backup link will be activated 10 seconds after
primary link
goes down.
!--- Backup link will be deactivated 30 seconds after primary
link
is restored.
</font></i> backup interface Dialer1
<i><font color="#3333FF">!--- Interface Dialer 1 will provide backup.
</font></i> ip address 192.168.10.2 255.255.255.252
encapsulation ppp
no fair-queue
clockrate 64000
ppp authentication chap
!
interface BRI0
ip unnumbered Loopback0
<i><font color="#3333FF">!--- unnumbered to the Loopback 0 address
</font></i> encapsulation ppp
dialer pool-member 10
<i><font color="#3333FF">!--- Assign BRI0 as member of dialer pool 10.
!--- Dialer pool 10 is specified in interface Dialer 1.
</font></i> isdn switch-type basic-ni
isdn spid1 51255511110101 5551111
isdn spid2 51255511120101 5551112
ppp authentication chap
<i><font color="#3333FF">!--- Use ppp chap authentication.
</font></i> ppp multilink
!
interface Dialer1
<i><font color="#3333FF">!--- Dialer 1 provides backup for the serial link.
</font></i> ip address 172.20.10.2 255.255.255.0
<i><font color="#3333FF">!--- Address for the dialer interface.
!--- The remote side dialer interface is in the same subnet.
</font></i> encapsulation ppp
dialer pool 10
<i><font color="#3333FF">!--- defines Dialer pool 10
!--- BRI 0 is a member of this pool.
</font></i> dialer remote-name maui-nas-05
<i><font color="#3333FF">!--- specifies remote router name
!--- This name must match that used by the remote router to
authenticate itself.
</font></i> dialer idle-timeout 900
<i><font color="#3333FF">!--- Idle timeout is set to 900 seconds (15 minutes).
!--- The link will be disconnected if there is no interesting
traffic for 900 secs.
!--- Since OSPF hellos are interesting traffic, this will reset
the idle timeout and
!--- cause the link to stay up until the primary link is
!--- restored.
</font></i> dialer string 5552222
<i><font color="#3333FF">!--- defines the destination routers phone number
</font></i> dialer load-threshold 80 outbound
<i><font color="#3333FF">!--- This sets the outbound load level for traffic at
which
!---additional connections will be added to the MP bundle load level.
!--- Values range from 1 (unloaded) to 255 (fully loaded). The threshold
!--- in this case is 80/255=32%.
</font></i> dialer-group 1
<i><font color="#3333FF">!--- apply interesting traffic definition from
dialer-list 1
</font></i> ppp authentication chap
<i><font color="#3333FF">!--- use ppp chap authentication
</font></i> ppp multilink
!
router ospf 5
log-adjacency-changes
network 172.16.1.0 0.0.0.255 area 0
network 172.17.1.0 0.0.0.255 area 0
network 172.20.10.0 0.0.0.255 area 0
network 192.168.10.0 0.0.0.3 area 0
!
ip classless
no ip http server
!
dialer-list 1 protocol ip permit
<i><font color="#3333FF">!--- All IP traffic is designated as interesting.
!--- This is applied to Interface Dialer 1 using dialer-group 1.
!--- OSPF hello packets will trigger the dial.
</font></i>!
line con 0
exec-timeout 0 0
login authentication NO_AUTHEN
transport input none
line vty 0 4
!
end</pre>
</td>
</tr>
</table>
<table BORDER CELLPADDING=3 WIDTH="80%" BGCOLOR="#FFFFFF" valign="TOP" >
<tr BGCOLOR="#CCCCFF">
<th><b>maui-nas-05 (3640)</b></th>
</tr>
<tr>
<td>
<pre>maui-nas-05#<b>show running-config
</b>Building configuration...
Current configuration:
!
version 12.1
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname maui-nas-05
!
aaa new-model
aaa authentication login default local
aaa authentication login NO_AUTHEN none
aaa authentication ppp default local
<i><font color="#0000FF">!--- basic AAA configuration for ppp calls
</font></i>enable secret 5 <deleted>
!
username maui-soho-01 password 0 cisco
<i><font color="#3333FF">!--- username for remote router (maui-soho-01) and
shared secret
!---(used for CHAP authentication)
!--- shared secret must be the same on both sides
</font></i>ip subnet-zero
!
isdn switch-type basic-ni
!
interface Loopback0
ip address 172.22.1.1 255.255.255.0
<i><font color="#0000FF">!--- The loopback address will be used by OSPF for the
router ID.
</font></i>!
interface Ethernet0/0
ip address 172.22.53.105 255.255.255.0
!
interface Ethernet0/1
no ip address
shutdown
!
interface BRI1/0
ip unnumbered Loopback0
<i><font color="#0000FF">!--- unnumbered to the Loopback 0 address
</font></i> encapsulation ppp
dialer pool-member 20
<i><font color="#0000FF">!--- Assign BRI0 as member of dialer pool 20.
!--- Dialer pool 20 is specified in interface Dialer 1.
</font></i> isdn switch-type basic-ni
isdn spid1 51255522220101 5552222
isdn spid2 51255522230101 5552223
ppp authentication chap
<i><font color="#0000FF">!--- Use ppp chap authentication.
</font></i> ppp multilink
!
<i><font color="#0000FF">! <<-- Unused interface configurations have been
removed.
</font></i>!
interface Serial2/0
<i><font color="#0000FF">!--- primary interface
</font></i> ip address 192.168.10.1 255.255.255.252
encapsulation ppp
no fair-queue
ppp authentication chap
!
<i><font color="#0000FF">! <<--Unused interface configurations have been
removed.
</font></i>!
interface Dialer1
<i><font color="#0000FF">!--- Dialer 1 provides backup for the serial link.
</font></i> ip address 172.20.10.1 255.255.255.0
<i><font color="#0000FF">!--- address for the dialer interface
!--- The remote side dialer interface is in the same subnet.
</font></i> encapsulation ppp
dialer remote-name maui-soho-01
<i><font color="#0000FF">!--- specifies remote router name
!--- This name must match that used by the remote router to
authenticate itself.
</font></i> dialer pool 20
<i><font color="#0000FF">!--- defines dialer pool 20
</font></i> dialer idle-timeout 900
<i><font color="#0000FF">!--- Idle timeout is set to 900 seconds (15 minutes).
!--- This is equal to the idle timeout set on maui-soho-01.
</font></i> Dialer max-call 4096
dialer-group 1
<i><font color="#0000FF">!--- apply interesting traffic definition from
dialer-list 1
</font></i> ppp authentication chap
<i><font color="#0000FF">!--- Use ppp chap authentication.
</font></i> ppp multilink
!
router ospf 5
network 172.20.10.0 0.0.0.255 area 0
network 172.22.1.0 0.0.0.255 area 0
network 172.22.53.0 0.0.0.255 area 0
network 192.168.10.0 0.0.0.3 area 0
default-information originate
<i><font color="#0000FF">!--- transmit ospf default information
!--- This may be required for remote router to use the BRI DDR
link.
</font></i>!
ip classless
ip route 0.0.0.0 0.0.0.0 Ethernet0/0
no ip http server
!
dialer-list 1 protocol ip permit
<i><font color="#0000FF">!--- All IP traffic is designated as interesting.
!--- This is applied to Interface Dialer 1 using dialer-group
1.
</font></i>!
line con 0
login authentication NO_AUTHEN
transport input none
line 97 102
line aux 0
line vty 0 4
!
end
</pre>
</td>
</tr>
</table>
<h2>
<a NAME="debug"></a>Debug and Show Commands</h2>
Before issuing <b>debug</b> commands, please see <a
href="http://www.cisco.com/warp/customer/793/access_dial/debug.html">Important
Information on Debug Commands</a>.
<ul><b>show isdn status</b> - Ensure that the router is properly communicating
with the ISDN switch. In the output, verify that Layer 1 Status is ACTIVE,
and that the Layer 2 Status state = MULTIPLE_FRAME_ESTABLISHED appears.
This command also displays the number of active calls.
<p><b>show ip interface brief</b> - This will show dialer 1(on maui-soho-01)
in standby mode. Using dialer 1 as the backup interface means the physical
interface (BRI0) is not dedicated to the backup. Therefor, BRI 0 can be
used for normal DDR while the primary link is up
<p><b>debug dialer</b> - This is used to display DDR information about
the packets received on the dialer interface.
<p><b>debug isdn events</b> - This is used to see ISDN activity occurring
on the user side of the ISDN interface.
<p><b>debug isdn q931</b> - Shows call setup and tear down of the ISDN
network connection (Layer 3) between the router and the ISDN switch.
<p><b>debug ppp negotiation</b> - Displays information on PPP traffic and
exchanges while negotiating the PPP components including Link Control Protocol
(LCP), Authentication, and NCP. A successful PPP negotiation will first
open the LCP state, then Authenticate, and finally negotiate NCP.
<p><b>debug ppp authentication</b> - Displays the PPP authentication protocol
messages, including Challenge Authentication Protocol (CHAP) packet exchanges
and Password Authentication Protocol (PAP) exchanges. If you observe a
failure verify that the chap username and password are configured correctly.
<p><b>debug ppp error</b> - This is used to display protocol errors and
error statistics associated with PPP connection negotiation and operation.</ul>
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