C897 router ATM 0 interface not working via ISDN

s.slootweg · ‎07-26-2016

I have a Cisco C897VAG-LTE-GA-K9 router to use over DSL as main connection and with 4G card installed as back-up.

All is working well via DSL over POTS connection. However, it needs to work over ISDN. And in case I use the ISDN connection I get ATM0 initializing and not coming out of that state.

I have no idea what to do

#sh ip int brie
Interface IP-Address OK? Method Status Protocol
ATM0 unassigned YES NVRAM initializing down
Cellular0 unassigned YES NVRAM up up
Cellular1 unassigned YES unset down down
CellNM5 unassigned YES unset down down
Dialer1 unassigned YES NVRAM up up
Dialer2 <IP address> YES IPCP up up
Ethernet0 unassigned YES NVRAM administratively down down
GigabitEthernet0 unassigned YES unset down down
GigabitEthernet1 unassigned YES unset down down
GigabitEthernet2 unassigned YES unset down down
GigabitEthernet3 unassigned YES unset down down
GigabitEthernet4 unassigned YES unset down down
GigabitEthernet5 unassigned YES unset down down
GigabitEthernet6 unassigned YES unset down down
GigabitEthernet7 unassigned YES unset down down
GigabitEthernet8 unassigned YES NVRAM administratively down down
Virtual-Access1 unassigned YES unset up up
Vlan1 <IP address> YES NVRAM down down
Vlan2 <IP address> YES NVRAM down down
Vlan3 <IP address> YES NVRAM down down
Vlan4 <IP address> YES NVRAM down down

How can I get ATM0 to work via ISDN?

dmuinoorallo · ‎09-02-2016

Hello,

I think i could help you

Firstly

Difference between ISDN and ATM.

- ISDN uses circuit switching where as ATM uses packet switching communication
- ISDN is a point to point fixed bandwidth communication, where as ATM is a variable bandwidth communication
- ISDN delivers at minimum two simultaneous connections.

ATM is connection-oriented which establishes a logical connection between 2 end points before the commencement of data exchange.

Secondly

This is a example to configure ISDN

- Remote site

hostname branch1
!
username main password secret1
!
isdn switch-type basic-dms100
!
interface Ethernet 0 
ip address 131.108.64.190 255.255.255.0
!
interface BRI 0
encapsulation PPP
ip address 131.108.157.1 255.255.255.0
isdn spid1 415988488501 9884885
isdn spid2 415988488602 9884886
ppp authentication chap
dialer idle-timeout 300
dialer map IP 131.108.157.2 name main 4883
dialer-group 1
!
ip route 131.108.0.0 255.255.0.0 131.108.157.2   
!
ip route 0.0.0.0 0.0.0.0 131.108.157.2
!
dialer-list 1 protocol ip permit

- Main site

hostname main
!
username branch1 password secret1
username branch2 password secret2
!
isdn switch-type basic-dms100
!
interface Ethernet 0
ip address 131.108.38.1 255.255.255.0
!
interface BRI 0
encapsulation PPP
ip address 131.108.157.2 255.255.255.0
isdn spid1 415988488201 9884882
isdn spid2 415988488302 9884883
ppp authentication chap
dialer idle-timeout 300
dialer map IP 131.108.157.1 name branch1 4885
dialer-group 1
!
ip route 131.108.64.0 255.255.255.0 131.108.157.1
!

Georg Pauwen · ‎09-05-2016

Hello,

is this still a problem ? Try changing the pvc numbers to 0/35 or 8/35, respectively. Does your ATM interface configuration look like this ?

interface ATM0
 no ip address
 ip nat outside
 ip virtual-reassembly
 no atm ilmi-keepalive
 pvc 8/35
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
 !
 dsl operating-mode auto
!
interface Dialer0
 ip address negotiated
 ip mtu 1492
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 ppp authentication chap