configuring ISDN failover

pannupandit

My boss ha sassigned me a job. We have 1 leased line connection and we are also thinking of configuring ISDN as a backup in case leased line fails. But I dont know how to configure ISDN for fail over . If anybody has idea or any notes ...do tell me...
Thanx in advance
pannu

malcybood

have you looked into leasing an ISDN line from an ISP provider or do you have one available already?

- How many users are on the site?
- What is your current primary link speed/type? i.e. Cable, ADSL, SDSL, IP Clear, 0.5MB, 1MB, 2MB,4MB, 8MB etc?
- Have you looked at alternatives to ISDN?
- Is it for one site or many remote sites?

We have ISDN backup but on certain sites it is a waste of time (in my opinion) as when the circuit switches to ISDN backup it can take half an hour for remote sites to login and they get frustrated and dont bother using it.

It depends largely on your infrastructure and type of support you have on your primary link wether or not you bother with ISDN as it is expensive for rental (in the UK anyway)

Some companies consider a small bandwidth ADSL line as a backup nowadays i.e. 8MB Primary ADSL, 2MB SDSL, 2MB IP Clear & 0.5MB ADSL as a backup

It works out cheaper for a 256 or 500MB "unmanaged" ADSL backup link than line rental on a "managed" ISDN, again in the UK and this is an agreement my company have agreed with BT.

pannupandit

Bro we have only one remote site..so there wont be any problem. I just want the configurationm detail how to configure it.....
thanx
pannu

malcybood

ok cool jus thought you might want the info. Link below tells the requirements

http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/1600/1600icg/isdn.htm#12344 tells you evrything you need to know as far as i can see

I'll paste the config of one of my routers which has adsl and isdn backup in the next post. I've changed the phone numbers, domain names etc and WAN ip addresses. you need to set the isdn switch type to your relevant country as stated in the above link, remember this is a config for the UK:

Good luck man

malcybood

EDITED**********Taken out most of the irrelevant stuff as it was a bit irrelevant**********

tmg-a_test_1721#show run
Building configuration...

!
username tmg-a_test_1721 password 7 1304130107
memory-size iomem 25
clock timezone GMT 0
clock summer-time BST recurring last Sun Mar 2:00 last Sun Oct 2:00
aaa new-model
!
!
aaa authentication login default group tacacs+ enable
aaa authentication login linemethod group tacacs+ enable
aaa authentication login vtymethod group tacacs+ enable
aaa authentication login conmethod group tacacs+ enable
aaa accounting exec default start-stop group tacacs+
aaa accounting connection default start-stop group tacacs+
aaa session-id common
ip subnet-zero
ip tftp source-interface Loopback10
no ip domain lookup
!
no ip bootp server
!
isdn switch-type basic-net3
!
!interface BRI0
description *** ISDN local line No. 1708555555 ***
no ip address
dialer pool-member 10
isdn switch-type basic-net3
no cdp enable
!
interface Dialer1
description *** ADSL interface ***
ip address negotiated
ip nat outside
encapsulation ppp
dialer pool 1
dialer-group 1
ppp chap hostname tmg-a_test_1721@testCCNA.com
ppp chap password 7 11081D161B
!
interface Dialer10
description *** Back-up dialer for ADSL ***
ip address 151.121.0.100 255.255.0.0
ip nat out
encapsulation ppp
dialer pool 10
dialer string 01313333333
dialer-group 10
ppp chap hostname tmg-a_test_1721
ppp chap password 7 070E255F42
!
ip nat inside source static 192.168.168.240 10.99.121.9
ip classless
ip route 0.0.0.0 0.0.0.0 217.47.111.81
ip route 0.0.0.0 0.0.0.0 217.47.111.82
ip route 0.0.0.0 0.0.0.0 217.47.111.83
ip route 0.0.0.0 0.0.0.0 151.121.0.1 200 name stby_to_Edinb
ip tacacs source-interface Loopback10
ip http server
!
!
dialer-list 10 protocol ip list 101
tacacs-server host 194.102.9.250
tacacs-server host 194.102.8.250
tacacs-server directed-request
tacacs-server key 4A2B96BE7A719226
snmp-server engineID local 000000090200000427227CD8
snmp-server community br1ck5 RW 96
snmp-server community snmp view v1default RO
snmp-server community cable-docsis RO 55
snmp-server community public RO
snmp-server community private RW
snmp-server trap-source Loopback10
snmp-server packetsize 2048
snmp-server enable traps snmp authentication linkdown linkup coldstart warmstart

snmp-server enable traps tty
snmp-server enable traps frame-relay
snmp-server enable traps frame-relay subif
snmp-server host 194.102.18
snmp-server host 194.102.8.3 snmp
snmp-server host 194.102.9.7 snmp
radius-server authorization permit missing Service-Type
!
no scheduler allocate
sntp server 10.1.9.7
end

malcybood

Another cisco site with another example.....last post i promise lol

http://www.cisco.com/warp/public/125/fr_isdn_backup.html#conf

pannupandit

thanx a lot Bro
now i will seee...
pannu