02-03-2013 10:19 PM - edited 03-04-2019 06:55 PM
Hi everyone I am trying to set up backup connection for leases line using ISDN. I am not running any routing protocol. I have set up only static routes so i want to know what ISDN backup method should i use as i am not running any routing protocol. Please help me. I am pasting the running configuration of both the routers. Deoli is the one that is dialing for backup and DSCBL is the main server.
Please help me in choosing and also help me with the configuration
Deoli running config :
Current configuration : 2072 bytes
!
! No configuration change since last restart
version 15.1
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname deoli
!
boot-start-marker
boot-end-marker
!
!
enable secret 4 tnhtc92DXBhelxjYk8LWJrPV36S2i4ntXrpb4RFmfqY
!
no aaa new-model
!
no ipv6 cef
ip source-route
ip cef
!
!
!
!
!
multilink bundle-name authenticated
!
isdn switch-type basic-net3
crypto pki token default removal timeout 0
!
!
license udi pid CISCO1941/K9 sn FGL161522G8
!
!
!
!
!
!
!
!
interface Embedded-Service-Engine0/0
no ip address
shutdown
!
interface GigabitEthernet0/0
ip address 192.168.38.101 255.255.255.0
duplex auto
speed auto
!
interface GigabitEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface BRI0/0/0
ip address 10.50.10.2 255.255.255.252
encapsulation hdlc
dialer idle-timeout 30
dialer map ip 10.50.10.1 name DSCBL broadcast 23252112
dialer load-threshold 100 either
dialer-group 1
isdn switch-type basic-net3
isdn point-to-point-setup
isdn calling-number 1129914917
!
interface Serial0/1/0
ip address 172.50.25.117 255.255.255.252
encapsulation ppp
!
interface Dialer1
no ip address
!
interface Dialer2
no ip address
!
interface Dialer11
no ip address
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
ip route 0.0.0.0 0.0.0.0 192.168.38.1
ip route 172.50.25.116 255.255.255.252 172.20.1.1
ip route 192.168.1.0 255.255.255.0 Serial0/1/0
ip route 192.168.3.0 255.255.255.0 Serial0/1/0
!
dialer-list 1 protocol ip permit
!
!
snmp-server community dscb RO
!
control-plane
!
!
!
line con 0
line aux 0
line 2
no activation-character
no exec
transport preferred none
transport input all
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
stopbits 1
line vty 0 4
password remote
login
transport input all
!
scheduler allocate 20000 1000
end
deoli#
===========================================================================================================
DSCBL#sh runn
Building configuration...
Current configuration : 4592 bytes
!
version 15.1
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname DSCBL
!
boot-start-marker
boot system flash c2800nm-ipbasek9-mz.151-1.T.bin
boot-end-marker
!
card type e1 1
enable secret 5 $1$GRP5$DExBv1hCSO08L.A2SS9Tc.
!
no aaa new-model
no network-clock-participate slot 1
!
dot11 syslog
ip source-route
!
!
ip cef
!
!
multilink bundle-name authenticated
!
isdn switch-type primary-net5
!
!
!
!
!
license udi pid CISCO2851 sn FHK1401F1AK
username nangloi password 0 cisco123
username narelamandi password 0 cisco
!
!
controller E1 1/0
framing NO-CRC4
pri-group timeslots 1-31
!
controller E1 1/1
framing NO-CRC4
pri-group timeslots 1-31
!
!
!
!
!
interface Multilink1
ip address 172.16.31.1 255.255.255.252
ip flow ingress
ip virtual-reassembly
ppp multilink
ppp multilink group 1
!
interface GigabitEthernet0/0
ip address 192.168.1.101 255.255.255.0
duplex auto
speed auto
!
interface GigabitEthernet0/1
ip address 10.10.10.2 255.255.255.252
duplex auto
speed auto
!
interface Serial0/2/0
bandwidth 2048
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
!
interface Serial0/2/1
bandwidth 2048
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
!
interface Serial1/0:15
no ip address
encapsulation hdlc
isdn switch-type primary-net5
!
interface Serial1/1:15
ip address 10.50.10.1 255.255.255.252
encapsulation hdlc
dialer idle-timeout 30
dialer map ip 10.50.10.2 name deoli broadcast 29914917
dialer load-threshold 100 either
dialer-group 2
isdn switch-type primary-net5
isdn incoming-voice data 64
isdn calling-number 1123252112
!
interface Dialer1
no ip address
shutdown
!
interface Dialer2
no ip address
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
ip flow-export version 5
ip flow-export destination 192.168.1.16 9996
!
ip route 0.0.0.0 0.0.0.0 192.168.1.99
ip route 192.168.3.0 255.255.255.0 Multilink1
ip route 192.168.4.0 255.255.255.0 Multilink1
ip route 192.168.5.0 255.255.255.0 Multilink1
ip route 192.168.6.0 255.255.255.0 Multilink1
ip route 192.168.7.0 255.255.255.0 Multilink1
ip route 192.168.8.0 255.255.255.0 Multilink1
ip route 192.168.9.0 255.255.255.0 Multilink1
ip route 192.168.10.0 255.255.255.0 Multilink1
ip route 192.168.11.0 255.255.255.0 Multilink1
ip route 192.168.12.0 255.255.255.0 Multilink1
ip route 192.168.13.0 255.255.255.0 Multilink1
ip route 192.168.14.0 255.255.255.0 Multilink1
ip route 192.168.15.0 255.255.255.0 Multilink1
ip route 192.168.16.0 255.255.255.0 Multilink1
ip route 192.168.17.0 255.255.255.0 Multilink1
ip route 192.168.19.0 255.255.255.0 Multilink1
ip route 192.168.20.0 255.255.255.0 Multilink1
ip route 192.168.21.0 255.255.255.0 Multilink1
ip route 192.168.22.0 255.255.255.0 Multilink1
ip route 192.168.23.0 255.255.255.0 Multilink1
ip route 192.168.24.0 255.255.255.0 Multilink1
ip route 192.168.25.0 255.255.255.0 Multilink1
ip route 192.168.26.0 255.255.255.0 Multilink1
ip route 192.168.27.0 255.255.255.0 Multilink1
ip route 192.168.28.0 255.255.255.0 Multilink1
ip route 192.168.29.0 255.255.255.0 Multilink1
ip route 192.168.30.0 255.255.255.0 192.168.1.249
ip route 192.168.31.0 255.255.255.0 Multilink1
ip route 192.168.32.0 255.255.255.0 Multilink1
ip route 192.168.33.0 255.255.255.0 Multilink1
ip route 192.168.34.0 255.255.255.0 Multilink1
ip route 192.168.35.0 255.255.255.0 Multilink1
ip route 192.168.36.0 255.255.255.0 192.168.1.99
ip route 192.168.37.0 255.255.255.0 Multilink1
ip route 192.168.38.0 255.255.255.0 Multilink1
ip route 192.168.39.0 255.255.255.0 Multilink1
ip route 192.168.40.0 255.255.255.0 Multilink1
ip route 192.168.41.0 255.255.255.0 Multilink1
ip route 192.168.42.0 255.255.255.0 Multilink1
ip route 192.168.43.0 255.255.255.0 Multilink1
ip route 192.168.44.0 255.255.255.0 Multilink1
ip route 192.168.45.0 255.255.255.0 Multilink1
ip route 192.168.46.0 255.255.255.0 Multilink1
ip route 192.168.47.0 255.255.255.0 Multilink1
ip route 192.168.48.0 255.255.255.0 Multilink1
ip route 192.168.49.0 255.255.255.0 Multilink1
ip route 192.168.50.0 255.255.255.0 Multilink1
ip route 192.168.51.0 255.255.255.0 Multilink1
ip route 192.168.52.0 255.255.255.0 Multilink1
ip route 192.168.53.0 255.255.255.0 Multilink1
!
access-list 101 permit ip any any
access-list 101 permit icmp any any
access-list 107 permit ip any any
dialer-list 2 protocol ip permit
!
snmp-server community dscb RW
!
control-plane
!
!
line con 0
line aux 0
line vty 0 4
password remote
login
transport input all
!
scheduler allocate 20000 1000
end
DSCBL#
02-04-2013 03:32 AM
Hello Ujjwal,
without dynamic routing protocol you need to use a floating default route that is with an high administrative distance
on deoli add :
ip route 0.0.0.0 0.0.0.0 10.50.10.1 221
the last number is the AD and makes this a backup static route used only if the primary default route is removed from IP routing table
Hope to help
Giuseppe
02-05-2013 07:45 AM
Thanks for the quick reply Giuseppe. Really appreciate it. I tried with what you have said and other different methods too. The issue is when the connection from Deoli goes down it dials to the DSCBL router but the DSCBL router is still using the multilink interface to route its packets hence its not sending packets on ISDN. As a static route has been given in DSCBL that
ip route 192.168.38.0 255.255.255.0 Multilink1
Now come what may this Multilink1 does not go down and if the serial interface at the Deoli end goes down activating the ISDN backup still the Multilink keeps sending packets on that interface even if i put a static route along with this i.e
ip route 192.168.38.0 255.255.255.0 s1/1:15 250
it still uses the multlink.
I tried using OSPF but the routes of OSPF do not come into the routing table untill the Multilink interface goes down
Now how do i do that when Deoli serial interface s0/1/0 goes down the routes from ospf pop up on DSCBL router or is there any other method
Please reply
Thanks in advance
02-05-2013 08:21 AM
Hello Ujjwal,
you should run OSPF on the primary link multilink not on the backup ISDN link.
In this way when OSPF fails both routers will agree on using the ISDN backup path.
And OSPF will go down as soon as the OSPF dead interval expire.
Hope to help
Giuseppe
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide