problem with ddr for a backup configuration

[mbeaver]

Thanks for showing an interest!

Here's the situation, We have a remote site with a frame relay connection (via ser0) which we want to back up with an isdn backup line using ddr and a dialer profile to the main site.
Here is the config of the router

:version 12.0

service timestamps debug datetime
service timestamps log datetime
no service password-encryption
service udp-small-servers
service tcp-small-servers
!
hostname remoterouter
!
aaa new-model
aaa authentication login default group tacacs+ local
aaa authentication ppp default local
aaa authorization exec default group tacacs+
aaa accounting exec default start-stop group tacacs+
aaa accounting network default start-stop group tacacs+
enable secret 5 xxxxxxxxxxxx
enable password xxxxxxxxxxxxx
!
username master password 7 xxxxxxxxxxxxxxx
username trr004x password 7 xxxxxxxxxxxxx
!
!
clock timezone gmt 0
clock summer-time bst recurring last Sun Mar 2:00 last Sun Oct 2:00
ip subnet-zero
!
isdn switch-type basic-net3
isdn voice-call-failure 0
isdn tei-negotiation first-call
!
!
interface Loopback0
no ip address
no ip directed-broadcast
!
interface Ethernet0
ip address 10.28.0.1 255.255.252.0
ip helper-address 10.2.44.200
ip helper-address 10.2.16.10
no ip directed-broadcast
keepalive 4
!
interface Serial0
description Frame-Relay Link
bandwidth 64
ip address 10.1.16.2 255.255.252.0
no ip directed-broadcast
encapsulation frame-relay
no ip route-cache
no ip mroute-cache
no fair-queue
frame-relay map ip 10.1.16.1 100 broadcast
frame-relay lmi-type ansi
!
interface Serial1
no ip address
no ip directed-broadcast
shutdown
!
interface BRI0
description dial backup link
bandwidth 56
no ip address
no ip directed-broadcast
encapsulation ppp
no ip route-cache
no ip mroute-cache
no keepalive
dialer pool-member 1
isdn switch-type basic-net3
no fair-queue
no cdp enable
!
interface Dialer0
ip address 10.2.176.10 255.255.255.0
no ip directed-broadcast
encapsulation ppp
dialer remote-name trr004x
dialer pool 1
dialer idle-timeout 90
dialer string 01793848012
dialer-group 1
no fair-queue
no cdp enable
ppp authentication chap
ppp multilink
!
interface Dialer1
no ip address
no ip directed-broadcast
no cdp enable
!
router eigrp 1
network 10.0.0.0
network 144.98.0.0
no auto-summary
!
no ip classless
no ip forward-protocol udp tftp
no ip forward-protocol udp nameserver
no ip forward-protocol udp domain
no ip forward-protocol udp time
no ip forward-protocol udp netbios-ns
no ip forward-protocol udp netbios-dgm
no ip forward-protocol udp tacacs
ip route 0.0.0.0 0.0.0.0 Dialer0 200
no ip http server
!
logging trap debugging
access-list 101 deny eigrp any any
access-list 101 permit ip any any
dialer-list 1 protocol ip list 101
!
tacacs-server host 10.2.44.208
tacacs-server host 10.2.44.206
tacacs-server timeout 1000
tacacs-server key cisco
snmp-server engineID local 00000009020000E01E3E7080
snmp-server community public xxxxxxx
!
line con 0
transport input none
line aux 0
password xxxxxxxx
no activation-character
modem InOut
stopbits 1
flowcontrol hardware
line vty 0 4
password xxxxxxx
!
ntp clock-period 17179522
ntp server 144.98.31.172
end


MRR001X#sh ver
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-P-L), Version 12.0(7)T, RELEASE SOFTWARE (fc2)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Mon 06-Dec-99 19:39 by phanguye
Image text-base: 0x0303C3D4, data-base: 0x00001000

ROM: System Bootstrap, Version 11.0(10c), SOFTWARE
BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c), RELEASE SOF)

MRR001X uptime is 22 hours, 16 minutes
System returned to ROM by power-on
System restarted at 15:17:01 bst Wed Jul 24 2002
System image file is "flash:c2500-p-l.120-7.T.bin"

cisco 2500 (68030) processor (revision N) with 6144K/2048K bytes of memory.
Processor board ID 06099777, with hardware revision 00000001
X.25 software, Version 3.0.0.
Basic Rate ISDN software, Version 1.1.
1 Ethernet/IEEE 802.3 interface(s)
2 Serial network interface(s)
1 ISDN Basic Rate interface(s)
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read ONLY)

Configuration register is 0x2102


One problem is that the dialer interface is not dialing out when I ping an ip address on the main site from the remote site after having shut down the frame relay serial interface (administritively). I have tried pinging directly from the remote router and the dialer interface is not dialing out. The bri interface is working as it brings itself up to connect to the ntp server every couple of minutes (which is another problem).
The floating static default route is shown in the route table after having shut down the serial interface along with the subnets of the ethernet and dialer interfaces (and all the eigrp routes disappear).
If i do a debug dialer packets i see the following:

Jul 25 10:30:56: Dialer0 DDR: ip (s=10.2.176.10, d=224.0.0.10), 60 bytes, outgoing uninteresting (list 101)
Jul 25 10:31:00: Dialer0 DDR: ip (s=10.2.176.10, d=224.0.0.10), 60 bytes, outgoing uninteresting (list 101)

but no sign of the ping attempts that are running on the network. I would have expected to see the pings in the dbug as interesting traffic but there is no sign of them.
Please let me know if you need any further information.
Rgds,
Martin

 

[writemem]

first off show show the output from the "show isdn status" i was under the impression that you had to configure the spid on the bri interface. i have a couple of ISDN interfaces in my neetwork but not a ton but they all have specified spids. The sh isdn status command will indicate if the isdn is communicating with the host switch properly.
Mark

 

[mbeaver]

all 3 layers are active. it can't be a problem with isdn as the router connects to the ntp server every minute or so via the bri interface. the problem i'm having is that the traffic is not being seen as interesting for some reason.

 

[pplewis]

configure 'ip classless'

 

[Saeed42]

If you want your ISDN backup to come up as soon as your int S0 goes down then you need to tell the S0 to use the BR0 interface as a backup by using these commands
int s0
command backup delay 5 30
backup interface BRI0




Hope that helps

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Don't be content with being average. Average is as close to the bottom as it is to the top
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 

[mbeaver]

thanks for the info, i'll give this a go.

 

[OCiTiLLO]

ip classless is enabled by default

your backup statement should be:

backup interface dialer0

 

[pplewis]

you have 'no ip classless' in your config that you've posted

 

[croxo]

Try and ping the remote WAN interface rather than a host on the remote network, use the debug dialer command to view the dialer activity.

A couple of notes on Backup Interface command. Backup is only initiated when the link is "down" but is NOT initiated when the interface is administratively shutdown.
This command is not always useful when using Frame-Relay as you can have a situation where although your remote site is unreachable due to an inactive PVC the link status can still be UP and your backup will not be initiated - better to use floating static routes or Dialer Watch command when using Frame-Relay.

 

[marsd]

Not backup interface BRI0!
This is right:
backup interface dialer0
backup delay 10 30

HTH