I've inherited a Cisco 3600 which originally had a Pri rate ISDN interface
and a network interface.
This was setup and running to not only dial our ISP but also to dial into
some other customers via ISDN. I was told that 15 isdn channels fed into
this interface.
We then moved over to a leased line and purchased an X.21 card. At the same
time we added a firewall. Due to the configuration of the firewall we lost
the ability to dial into our customers (The router was no longer reachable
from our network as the firewall had hidden it!) We now have a different
firewall and the router is visible again.
I'm trying to resurrect the ISDN connections but I am not having much fun !
I need some help in debugging it to try and find out what is going on.
I issued the commands debug isdn q921 and debug isdn q931 and then when I
ping something that has a route entry and dialer setup I get the following
debug output
interprod1-1-gw#ping 192.168.88.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.88.1, timeout is 2 seconds:
01:38:50: Serial1/0:15: rotor dialout [priority]
01:38:50: Serial1/0:15: Dialing cause ip (s=193.xxx.xxx.xx, d=192.168.88.1)
01:38:50: Serial1/0:15: Attempting to dial 90171xxxxxx..
01:38:54: %ISDN-6-LAYER2DOWN: Layer 2 for Interface Se1/0:15, TEI 0 changed
to d
own
01:38:54: ISDN Se1/0:15: Event: received NL_REL_IND
01:38:54: Serial1/0:15: wait for carrier timeout, call id=0x800E.
01:38:56: Serial1/0:15: rotor dialout [priority]
01:38:56: Serial1/0:15: Dialing cause ip (s=193.xxx.xxx.xx, d=192.168.88.1)
01:38:56: Serial1/0:15: Attempting to dial 90171xxxxxx..
Success rate is 0 percent (0/5)
interprod1-1-gw#
01:39:00: %ISDN-6-LAYER2DOWN: Layer 2 for Interface Se1/0:15, TEI 0 changed
to d
own
01:39:00: ISDN Se1/0:15: Event: received NL_REL_IND
01:39:00: Serial1/0:15: wait for carrier timeout, call id=0x800F
When I do show int
The serial interface for serial 1/0:0 to serial 1/0:14 is down,line protocol
is down
but for serial 1/0:15 it is up, line protocol is up (spoofing)
Sho isdn status gives me
ISDN Serial1/0:15 interface
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED
Layer 3 Status:
0 Active Layer 3 Call(s)
Activated dsl 0 CCBs = 0
Number of L2 Discards = 129, L2D_Task Discards = 53
Total Allocated ISDN CCBs = 0
Does any of this shed any light on why it does n't work. What other things
do I need to look at.
As you've probably realised I'm new to this Cisco stuff !
The only other thing I can remember is when the firewall people reconfigured
the Cisco they did have some problems with Timeslots. Are these important !
If any more info is require let me know.
As an aside can anyone point in the direction of a good book on configuring
Cisco routers ?
TIA
Andy
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