12-07-2003 01:39 AM - edited 03-02-2019 12:11 PM
We have two 1721 routers connected via dial on demand ISDN.
The routers will connect and route with no problems on one channel. Whenever the second channel tries to come up both channels are dropped.
Sometimes one channel will drop and re-establish the connection.
Debug q931 shows several different ISDN cause codes such as Temporary Fault, Circuit not available, No user response.
The ISDN lines have been checked and show no problems.
Another manufacturers routers work both channels with no problems.
Thank you for any assistance!
12-07-2003 01:49 AM
Hello,
can you post your config, your IOS version (it might be a software bug), and the output of the debug q931 command ?
Regards,
Georg
12-07-2003 02:19 AM
IOS v12.2
Current configuration : 1308 bytes
!
version 12.2
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname Redcar
!
enable password 7 xxxxxxxxxxxxxx
!
username PT-Red password 7 xxxxxxxxxx
ip subnet-zero
no ip domain-lookup
!
isdn switch-type basic-net3
!
!
!
interface BRI0
description connected to PT-Red
encapsulation ppp
dialer idle-timeout 1200
dialer fast-idle 120
dialer map ip 192.168.116.202 name PT-Red broadcast 01639888888
dialer load-threshold 85 outbound
dialer-group 1
isdn switch-type basic-net3
no fair-queue
no cdp enable
ppp authentication chap
ppp multilink
!
interface Fastethernet0
description connectoed to EthernetLAN_1
ip address 192.168.144.1 255.255.255.224
ip helper-address 192.168.116.5
no keepalive
speed auto
!
router rip
version 1
network 192.168.144.0
no auto-summary
!
ip classless
ip route 0.0.0.0 0.0.0.0 192.168.116.202
ip route 192.168.116.202 255.255.255.255 BRI0
no ip http server
!
!
access-list 101 permit icmp any any
access-list 101 permit ip any any
dialer-list 1 protocol ip list 101
snmp-server community public R0
!
line con 0
exec-timeout 0 0
password 7 xxxxxxxxx
login
line aux 0
line vty 0 4
password 7 xxxxxxxxxxxxxxxxxx
login
!
no scheduler allocate
end
This is the config of the remote router the host is identical apart from different tel numbers and usernames etc.
Thanks for the quick response!
Will dig out the q931 output later if you need it.
Many thanks
Ieuan
12-07-2003 04:10 AM
Hello,
if you post your IOS version I will check the software bug navigator. Also, try to post the output of:
debug dialer
debug isdn q931
debug ppp negotiation
Meanwhile, there might be some useful information in this document:
Troubleshooting Second B-channel Call Failures on ISDN BRI Links
http://www.cisco.com/en/US/partner/tech/tk801/tk379/technologies_tech_note09186a0080094b7a.shtml
Regards,
Georg
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