ISDN Backup on GRE interface with dynamic protocol.

Answered Question
Jul 22nd, 2010

Hi all,

I am trying to configure ISDN backup for a client. The scenario is as follows:

Remote branch is connected through Metro ethernet with edge router A. Routing protocol is OSPF and everything is tunneled through a GRE tunnel.

I need to configure ISDN backup in which the same remote router will call to edge router B. Not only that i will need a full OSPF table (due to some multicast applications that are running) and a time-based ACL.

I have tried to simulate this on the lab using 2x 1841 routers. The configuration is as follows:

Router1: Remote router (caller)

------------------------------------------------

version 12.4

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname TWO

!

boot-start-marker

boot system flash flash:c1841-advipservicesk9-mz.124-24.T1.bin

boot-end-marker

!

logging message-counter syslog

enable password cisco

!

no aaa new-model

clock timezone EET 2

clock summer-time EEST recurring last Sun Mar 3:00 last Sun Oct 3:00

dot11 syslog

ip source-route

!

!

ip dhcp excluded-address 10.6.6.1

!

!

!

ip cef

no ipv6 cef

ntp server 192.168.255.2

!

multilink bundle-name authenticated

!

isdn switch-type basic-net3

isdn tei-negotiation first-call

!

!

!

!

username cisco password 0 cisco

username ONE password 0 cisco

username TWO password 0 cisco

archive

log config

  hidekeys

!

!

!

!

!

!

track 1 ip sla 1 reachability

!

!

!

interface Loopback0

ip address 10.2.2.2 255.255.255.255

!

interface Tunnel1

ip address 10.4.4.2 255.255.255.0

ip ospf network point-to-point

keepalive 10 3

tunnel source FastEthernet0/1

tunnel destination 10.3.3.1

!

interface FastEthernet0/0

description LAN

ip address 10.6.6.1 255.255.255.0

duplex auto

speed auto

!

interface FastEthernet0/1

description LINK

ip address 10.3.3.2 255.255.255.0

load-interval 30

duplex auto

speed auto

!

interface BRI0/0/0

no ip address

encapsulation ppp

dialer pool-member 1

dialer idle-timeout 60

isdn switch-type basic-net3

isdn point-to-point-setup

no cdp enable

ppp authentication chap

!

interface Dialer0

ip address 10.7.7.2 255.255.255.0

encapsulation ppp

dialer pool 1

dialer remote-name ONE

dialer idle-timeout 60

dialer string 123456789

dialer load-threshold 1 outbound

dialer-group 1

no cdp enable

ppp authentication chap

ppp multilink

!

router ospf 1

log-adjacency-changes

passive-interface default

network 0.0.0.0 255.255.255.255 area 0

!

ip local policy route-map MY-LOCAL-POLICY

ip forward-protocol nd

ip route 0.0.0.0 0.0.0.0 10.4.4.1 track 1

ip route 0.0.0.0 0.0.0.0 10.7.7.1 254

ip http server

no ip http secure-server

!

!

!

ip sla 1

icmp-echo 10.1.1.1

timeout 1000

threshold 2

frequency 3

ip sla schedule 1 life forever start-time now

access-list 101 deny   ospf any any

access-list 101 permit ip any any time-range TRADING-HOURS

access-list 111 permit ip 10.6.6.0 0.0.0.255 10.5.5.0 0.0.0.255 time-range TRADING-HOURS

access-list 112 permit icmp any host 10.1.1.1 echo

dialer-list 1 protocol ip list 111

!

!

!

!

route-map MY-LOCAL-POLICY permit 10

match ip address 112

set ip next-hop 10.4.4.1

set interface Dialer0 Null0

!

!

!

control-plane

!

!

!

line con 0

logging synchronous

line aux 0

line vty 0 4

password cisco

login

!

scheduler allocate 20000 1000

time-range TRADING-HOURS

periodic weekdays 8:00 to 18:30

!

end

Router2: Edge router (callee)

------------------------------------------------

version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname ONE
!
boot-start-marker
boot-end-marker
!
logging buffered 10000 debugging
enable password cisco
!
no aaa new-model
memory-size iomem 25
clock timezone EET 2
clock summer-time EEST recurring last Sun Mar 3:00 last Sun Oct 3:00
no ip source-route
no ip gratuitous-arps
ip cef
!
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
!
isdn switch-type basic-net3
!
!
username ONE password 0 cisco
username TWO password 0 cisco
!
!
!
!
!
!
interface Loopback0
ip address 10.1.1.1 255.255.255.255
!        
interface Tunnel1
ip address 10.4.4.1 255.255.255.0
ip ospf network point-to-point
keepalive 10 3
tunnel source FastEthernet0/1
tunnel destination 10.3.3.2
!
interface FastEthernet0/0
description LAN
ip address 10.5.5.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
description LINK
ip address 10.3.3.1 255.255.255.0
duplex auto
speed auto
!
interface BRI0/0/0
description BACKUP ISDN
no ip address
encapsulation ppp
no ip route-cache cef
no ip route-cache
no ip mroute-cache
load-interval 30
dialer pool-member 1
dialer idle-timeout 60
isdn switch-type basic-net3
isdn point-to-point-setup
no keepalive
no fair-queue
no cdp enable
ppp authentication chap
!
interface Dialer0
ip address 10.7.7.1 255.255.255.0
encapsulation ppp
no ip route-cache cef
no ip route-cache
no ip mroute-cache
dialer pool 1
dialer remote-name TWO
dialer idle-timeout 0
dialer-group 1
no cdp enable
ppp authentication chap
ppp multilink
!
router ospf 1
log-adjacency-changes
passive-interface default
network 0.0.0.0 255.255.255.255 area 0
!
ip forward-protocol nd
!
ip http server
no ip http secure-server
!
ip access-list extended dial
permit ip host 10.7.7.1 host 10.7.7.2 time-range TRADING_HOURS
!
access-list 101 deny   ospf any any
access-list 101 deny   udp any any eq ntp
access-list 101 permit ip any any time-range TRADING_HOURS
access-list 111 permit ip 10.5.5.0 0.0.0.255 10.6.6.0 0.0.0.255 time-range TRADING_HOURS
access-list 111 permit ip host 10.7.7.1 host 10.7.7.2 time-range TRADING_HOURS
access-list 112 permit ip any any time-range TRADING_HOURS
dialer watch-list 1 ip 10.2.2.0 255.255.255.0
dialer-list 1 protocol ip list 111
!
!
control-plane
!
!
line con 0
logging synchronous
line aux 0
line vty 0 4
password cisco
login
!
scheduler allocate 20000 1000
ntp master
time-range TRADING_HOURS
periodic weekdays 8:00 to 18:30
!
end

I have managed so far to make it work with static routes. The thing is: how to make it work with OSPF?

Any help will be appreciated.

Thank you.

I have this problem too.
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