03-08-2011 08:10 AM - edited 03-04-2019 11:41 AM
Hi,
First of all sorry about my english. I´m trying to connect two Cisco 1841 routers via serial port trough two telephone modems. Each router is connected to the modem with a original cisco RS232/V.24 DTE cable.
These modems are connected each other with a four wire leased line. The modems are working fine, if I try with a different brand routers (allied telesys) everything works perfect.
I can´t establish connection between the routers. Despite of serial interface 0/0/1 is up,line protocol is down...
PS: It´s mandatory use serial port instead aux port. I have this scenario in the lab, the modems are connected just with a four wire cable so I needn´t dial telephone numbers or something like that.
Thanks in advance,
Unai
-----------------------------------------------------------------------------------------------------------------------------
Running config Router 1 (router 2 equals with different ip addresses)
Current configuration : 798 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Router
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip cef
!
!
!
!
no ppp hold-queue
multilink bundle-name authenticated
!
!
archive
log config
hidekeys
!
!
!
!
!
interface FastEthernet0/0
ip address 10.10.10.1 255.255.255.0
speed 100
full-duplex
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0/0
no ip address
shutdown
no fair-queue
clock rate 125000
!
interface Serial0/0/1
ip address 11.10.10.1 255.255.255.0
!
ip forward-protocol nd
!
!
ip http server
!
!
!
control-plane
!
!
line con 0
line aux 0
line vty 0 4
login
!
scheduler allocate 20000 1000
end
03-08-2011 09:01 AM
Hi Unai,
the serial interface is configured for encapsulation HDLC, are you sure that the modem will understand it?
I would expect the modem to require PPP or SLIP, can you test it?
You wrote that with Allied Telesys the modems work fine, what's the config you are using there?
Cheers
Marco
03-09-2011 07:46 AM
03-14-2011 02:58 AM
Hi Unai,
Configure the serial interface for PPP, then collect the output of show controller serial and show interface serial.
I'd also enable "deb ppp nego" and "deb ppp packets" to see if there is any communication between modem and serial card.
Regards
Marco
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