2600 ISDN Backup Regular Dailing Problem

[robert.peters]

Hi

I have a 2600 hundred with a leased line connected via serial and a ISDN dialer backup. Everything has been working well until I got the telephone bill and noticed that the router seems to be dialing the backup almost every minute for a very short call.

Can anyone give me advice as to what to look for to track down what could be causing this and what debug commands I could use?

Many thanks

Rob

[liviu.gheorghe]

Can you post the config for the 2600 router?

[robert.peters]

Hi

Yes, glad to post it as follows. Thank you for helping!

Regards

Rob

================================================

version 12.2

service timestamps debug uptime

service timestamps log uptime

service password-encryption

!

hostname *****

!

enable password *********************

!

username ***** password ******

ip subnet-zero

!

!

no ip domain-lookup

!

isdn switch-type basic-net3

!

!

!

interface FastEthernet0/0

description connected to EthernetLAN

ip address 151.x.x.x.255.0.0

duplex auto

speed auto

!

interface Serial0/0

description connected to B

backup delay 15 60

backup interface Dialer1

ip address 10.152.x.x.x.255.252

encapsulation ppp

!

interface BRI0/0

description connected to B

no ip address

encapsulation ppp

dialer rotary-group 1

isdn switch-type basic-net3

no cdp enable

!

interface Dialer1

description connected to B

ip address 10.152.2.1 255.255.255.252

encapsulation ppp

no ip split-horizon

dialer in-band

dialer map snapshot 1 name B broadcast

dialer map ip 10.152.2.2 name B broadcast 0******

dialer hold-queue 10

dialer load-threshold 10 outbound

dialer-group 1

snapshot server 15 dialer

no cdp enable

ppp authentication chap

ppp multilink

!

router rip

version 2

network 10.0.0.0

network 151.151.0.0

no auto-summary

!

ip classless

no ip http server

ip pim bidir-enable

!

dialer-list 1 protocol ip permit

snmp-server community public RO

!

line con 0

exec-timeout 0 0

password *************

login

line aux 0

line vty 0 4

password *************

login

!

no scheduler allocate

end

[csgan]

If your DDR is dialing up every minute, you should run debug dialer. That will show the dialing cause.

[glen.grant]

Also to me it looks like your have dialer load threshold set awfully low , you might want to consider making this a higher number , this might be triggering it also , but to determine which ip is causing the dial you the debug dialer command as indicated in the previous post .

[dszmandi]

Looks like you've got snapshot routing configured here.... Any need for it? Check out CCO documentation regarding snapshot routing.

Hope this helps.

Daniel

[amorgos]

1) Check the need for snapshot routing.

2) Add "passive-int b0/0" at your router rip.

3) Relate your dialer-list to the kind of traffic that you want to be considered as interesting, via an acl.

[steve.rivkind]

Do you have an access list set up so that only significant traffic will cause an isdn call to initiate. We use the following format:

access-list 100 deny eigrp any any

access-list 100 deny ip host 255.255.255.255 any

access-list 100 permit ip any

dialer-list 1 protocl ip list 100

You might want to substitute the eigrp with rip.