For Out Of Band Management (Dial-in):
This Config allows one to dial-in to the router for out of band mgmt when the main line is down. This cannot be used as a link for internet access.
this sample is from 891-F
use show platform and identify modem port. You can use show line as well.
------------------ show platform ------------------
Interrupts:
===========
Assigned Handlers...
Vect Handler # of Ints Name
0 05521278 1 CPLD Interrupt
1 0564BAD4 0 PEB3081 ISDN S/T Transceiver Interrupt
2 05A7D69C 10 DX MRVL Address Update interrupt
3 05F8680C 0 V92 Modem Interrupt <<=======modem port
sample config:
interface Async3
no ip address
encapsulation slip
keepalive 10
line 3
exec-timeout 0 0
login local
modem InOut
transport input all
transport output all
stopbits 1
speed 115200
flowcontrol hardware
Special note: Please note at times you have to use "modem always-on" instead of "modem inout" and "autohangup" in addition to above.
use clear line <#> to clear the session.
following debugs can be used for troubleshooting:
debug modem
debug confmodem
show commands:
show modem version
show modem
show modem summary
show modem call-stats
Perform following to ensure line is good and modem is working fine
clear line 3
telnet 10.243.48.46 2003 -- any ip address that is showing up/up
atz - hit enter -this will reset modem config
ats0=1 - hit enter-this will tell modem to answer automatically after one ring
atd - enter -if you are local to the router you should hear dialtone
atdt <tel #> -it should dial out.. try to dial ur cell phone
upon reverse telnet into the modem if you get "no carrier" "no dialtone" then that is L1 issue.
Dial-Out (When using V.92 as a back-up interface for internet access):
Configuring a V.92 Modem Interface
The Cisco 891 ISR has a V.92 modem backup interface. To configure this interface, perform these steps, beginning in global configuration mode:
SUMMARY STEPS
- 1. interface type number
- 2. ip address ip-address mask
- 3. encapsulation ppp
- 4. dialer in-band
- 5. dialer string dial-string
- 6. dialer-group group-number
- 7. async mode dedicated
- 8. exit
