Question

ISDN backup Cisco 2621XM

Asked by: jajjones

Hi !

I have a 2621XM at a branch office in Italy.  Primary connectivity is via IPSec with a BRI (S/T interface) for backup.  My problem is that the branch is in a different EIGRP area to my core site where the ISDN call is terminated (UK).  Any suggestions as to how I should configure the router at the branch and the core ?

Further Info:

Branch is in area 24 (using /24 addresses)
Core is in area 31

I can paste the configs in but I am hoping that some initial answers will point me in the right direction.  The ISDN config per se is OK coz it works within the same area.........

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Asked On
2004-03-09 at 02:53:18ID20912148
Tags

isdn

,

backup

,

cisco

Topic

Network Routers

Participating Experts
1
Points
250
Comments
10

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Answers

 

by: snoopy13Posted on 2004-03-09 at 06:46:42ID: 10550639

If you paste the config it would be helpful, one you do that I could give some tips I have just configured something similar for a 40 site hub and spoke vpn solution.

 

by: jajjonesPosted on 2004-03-09 at 07:29:21ID: 10551045

Core.......


hostname UKCSCRT02
!
logging buffered 30000 errors
aaa new-model
!
!
aaa authentication login default group tacacs+ local
aaa authentication enable default group tacacs+ enable
aaa accounting update periodic 30
aaa accounting commands 1 default start-stop group tacacs+
aaa accounting commands 15 default start-stop group tacacs+
aaa session-id common
enable secret 5 $1$ilxI$uOezOBzLZF0qxZZPvVhUp1
enable password xxxxxxxx
!
username rhinsd password 0 xxxxxxxxxx
username ITMILRT01 password 0 xxxxxxxxxxx
ip subnet-zero
!
!
no ip domain-lookup
!
isdn switch-type primary-net5
!
controller E1 2/0
 pri-group timeslots 1-10,16
!
!
!
interface Loopback0
 ip address 172.31.x.x 255.255.255.255
!
interface FastEthernet0/0
 ip address 172.31.x.y 255.255.255.0
 speed 100
 full-duplex
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Hssi1/0
 no ip address
 encapsulation frame-relay
 serial restart_delay 0
 frame-relay traffic-shaping
 frame-relay lmi-type ansi
!
!
interface Serial2/0:15
 description **** Primary Rate ****
 no ip address
 encapsulation ppp
 no ip route-cache
 dialer rotary-group 0
 dialer-group 1
 isdn switch-type primary-net5
 no cdp enable
 ppp authentication chap
 ppp multilink
!
interface Dialer0
 description ***ISDN PRI (0121-aaa-bbbb)***
 ip address 172.31.x.1 255.255.255.0
 encapsulation ppp
 no ip route-cache
 no ip mroute-cache
 dialer in-band
 dialer idle-timeout 600
 dialer map ip 172.31.250.26 name ITMILRT01 class dial1 003902xxxxxxxxx
 dialer load-threshold 200 outbound
 dialer-group 1
 no cdp enable
 ppp chap hostname xxxxxxx
 ppp multilink
!


Branch.........

!
hostname ITMILRT01
!
logging queue-limit 100
aaa new-model
aaa authentication login default group tacacs+ local
aaa authentication enable default group tacacs+ enable
aaa accounting update periodic 30
aaa accounting commands 1 default start-stop group tacacs+
aaa accounting commands 15 default start-stop group tacacs+
enable secret 5 whatever
enable password xxxxxx
!
username rhiadmin password 0 xxxxx
username rhinsd password 0 xxxxxx
ip subnet-zero
!
!
no ip domain-lookup
ip domain-name xxxxxxxx
no ip dhcp conflict logging
ip audit notify log
ip audit po max-events 100
!
crypto isakmp policy 1
 encr 3des
 authentication pre-share
 group 2
crypto isakmp key xxxxxxxxx address xxxxxxxx
crypto isakmp key xxxxxxxx address xxxxxxxx
!
crypto ipsec security-association lifetime seconds 28800
!
crypto ipsec transform-set yyyyyyy esp-3des esp-sha-hmac
!
crypto map yyyyyyyy 10 ipsec-isakmp
 set peer xxxxxxx
 set peer xxxxxxx
 set transform-set xxxxxxxxx
 match address 110
!
isdn switch-type basic-net3
call rsvp-sync
!
interface Loopback0
 ip address 172.24.x.y 255.255.255.255
!
interface FastEthernet0/0
 ip address 172.24.x.1 255.255.255.0
 ip helper-address 172.24.x.y
 duplex auto
 speed auto
 no cdp enable
!
interface BRI0/0
 description *****ISDN2e*****
 no ip address
 encapsulation ppp
 dialer pool-member 1
 isdn switch-type basic-net3
 isdn send-alerting
 ppp authentication chap
 ppp multilink
!
interface FastEthernet0/1
 ip address a.b.c.d 255.255.255.252
 ip access-group 102 in
 duplex auto
 speed auto
 no cdp enable
 crypto map yyyyyyy
!
interface Dialer0
 description ****ISDN Backup to UK*****
 ip address 172.31.250.26 255.255.255.0
 encapsulation ppp
 dialer pool 1
 dialer idle-timeout 396
 dialer string 00441217xxxxxxxx
 dialer-group 1
 ppp authentication chap
 ppp multilink
!
ip classless
ip route 0.0.0.0 0.0.0.0 a.b.c.d
ip route 0.0.0.0 0.0.0.0 Dialer0 250
ip tacacs source-interface FastEthernet0/0
no ip http server
!
access-list 101 permit ip any any
access-list 102 permit esp host a host b
access-list 102 permit esp host a host b
access-list 102 permit ahp host a host b
access-list 102 permit ahp host a host b
access-list 102 permit udp host a host b eq isakmp
access-list 102 permit udp host a host b eq isakmp
access-list 102 permit ip 192.168.0.0 0.0.255.255 172.24.x.0 0.0.0.255
access-list 102 permit ip 10.0.0.0 0.255.255.255 172.24.x.0 0.0.0.255
access-list 102 permit ip a.b.c.d 0.0.0.127 172.24.x.0 0.0.0.255
access-list 102 permit ip 172.31.0.0 0.0.255.255 172.24.x.0 0.0.0.255
access-list 102 permit ip 172.24.0.0 0.0.255.255 172.24.x.0 0.0.0.255
access-list 102 permit icmp any any
access-list 102 permit tcp any any eq 22
access-list 110 permit ip 172.24.x.0 0.0.0.255 10.0.0.0 0.255.255.255
access-list 110 permit ip 172.24.x.0 0.0.0.255 a.b.c.d 0.0.0.127
access-list 110 permit ip 172.24.x.0 0.0.0.255 172.31.0.0 0.0.255.255
access-list 110 permit ip 172.24.x.0 0.0.0.255 172.24.0.0 0.0.255.255
dialer-list 1 protocol ip list 101
no cdp run
tacacs-server host a.b.c.d
tacacs-server directed-request
tacacs-server key rrrrrrrrrr
!
dial-peer cor custom
!
!
line con 0
 exec-timeout 5 0
 password xxxxxx
line aux 0
 password xxxxxx
line vty 0 4
 password xxxxxx
 transport input pad v120 telnet rlogin udptn ssh
!

 

by: snoopy13Posted on 2004-03-12 at 01:09:21ID: 10579030

What I did on my case I changed the eigrp to the same group 10 and at the head end to destribute the routes that I wanated for the remote site by using an access-list denying any unwanted routes.
If you want to see the full configs let me know but in my case I am using two routers at each end one for the VPN tunnnel the other for ISDN back-up.

HEAD END ROUTER
router eigrp 10
 redistribute static
 network 10.10.10.0 0.0.0.3
 network 172.17.4.0 0.0.3.255
 distribute-list 50 out
!
ip route 0.0.0.0 0.0.0.0 172.17.4.1
ip route 212.147.1.2 255.255.255.255 Serial0/0

access-list 50 deny   212.147.1.2
access-list 50 deny   172.16.14.0 0.0.0.255
access-list 50 permit any

REMOTE SITE

router eigrp 10
 network 10.10.10.0 0.0.0.3
 network 172.16.15.0 0.0.0.255

ip route 0.0.0.0 0.0.0.0 172.16.15.11 200
ip route 212.137.1.1 255.255.255.255 Serial0/0

 

by: jajjonesPosted on 2004-03-12 at 04:26:47ID: 10579855

Thanks Snoopy......it makes sense.  I will give it a go over the weekend (when users are having a nice time leaving us alone :-)) and report back !  Thanks again....

 

by: jajjonesPosted on 2004-03-12 at 04:29:12ID: 10579876

just another quickie to maybe give you the fuller picture.......

The Milan site is primarily connected to the Brussels core site (using IPSec).  We don't have a PRI in Brussels but they want ISDN backup for the site.  Our core site in Birmingham has a PRI.  Brussels is eigrp 24, Birmingham is eigrp 31.  

 

by: snoopy13Posted on 2004-03-12 at 07:42:02ID: 10581361

Does the brussels site have ISDN? If do you can use ISDN BRI to configure the back-up from Milan to Brussels.

 

by: jajjonesPosted on 2004-03-15 at 03:48:16ID: 10596517

Snoopy....

The Brussels site is on an outsourced solution, and although it does have ISDN it is for that managed service.  In Birmingham we manage all our own network equipment and the Milan site is falling into that mould.  So although the Brussels site has ISDN we have to home the back-up to Birmingham.......hence the little complication with EIGRP areas !  What I was wondering over the weeken was - will EIGRP work on IPSec tunnels ???

 

by: snoopy13Posted on 2004-03-15 at 05:48:03ID: 10597093

I see, well to answer you other question you will have to run GRE tunnels for your EIGRP as it does not work over IPSEC.
You can still make it the back up work via Birmingham what you can do is have the same area in Birmingham and Milan and advertise the routes for Birmingham and Brussels via EIGRP and have static routes for those remote network via BRI interface with a weight of 200.

 

by: jajjonesPosted on 2004-03-15 at 06:15:43ID: 10597252

Thanks Snoopy.........I got myself mixed up on the statics.....cheers bud

 

by: snoopy13Posted on 2004-03-15 at 07:29:25ID: 10597861

No problem glad I could help

20120131-EE-VQP-002

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