Commands to troubleshoot ISDN issues and sample working config

 

#set system processes isdn-signaling traceoptions file isdnd.log
#set system processes isdn-signaling traceoptions flag all

#set interfaces br-x/x/x traceoptions flag all
#set interfaces br-x/x/x traceoptions file isdnd.log

start shell
su>>super user password

root>cty fpc 2               >> RE access to ISDN PIM, In this case, it is pim 2 (Interface:  br-2/0/1)

root>sh ifd brief         
This will give the index number for br interface.

PFPC2(uart)# sh ifd brief
Index Name Type Flags Slot State
----- -------------------- ----------- ------ ----- ------
0 .local. Local 0x0000000000000010 local Up
157 bc-2/0/1:1 HDLC 0x0000000000008004 2 Up
150 br-2/0/1 HDLC 0x0000000000008001 2 Harddown
152 br-2/0/2 HDLC 0x0000000000008001 2 Harddown
153 br-2/0/3 HDLC 0x0000000000008001 2 Harddown
156 dc-2/0/1 HDLC 0x0000000000008000 2 Up

PFPC2(uart)# sh ifd 150
Check for interface statistics on ifd interface using the index number.
Check for error counters and stats/alarms in the command output.

PFPC2(uart)# sh ifl brief
This will give index number for ifl (logical) interface for dc isdn-lapd interface.
use the index number in following command to get the status of the logical interface and incrementing counters.

Index Name Type Encapsulation Flags
----- -------------------- ------------- -------------- ------
0 .local..0 Unspecified Unspecified 0x0000000000000010
75 bc-2/0/1:1.0 PPP-Subordinate ??? (64) 0x0000000000000052
76 bc-2/0/1:2.0 PPP-Subordinate ??? (64) 0x0000000000000052
74 dc-2/0/1.32767 ISDN-LAPD ISDN-LAPD 0x0000000000000052

PFPC2(uart)# sh ifl 75

PFPC2(uart)# sh syslog messages

PFPC2(uart)# sh ifd summary

 

1. Confirm that Layer 1 is up with the command show isdn status, and confirm that the correct ISDN PIM is in use. If Layer 1 is down, refer to KB14447 - ISDN layer 1 status shows down on J Series router.
2. If the Layer 2 status is down, use the following traceoptions and commands for troubleshooting:
3. Below is a sample working config for reference:
4. interface {
br-2/0/1 {
description " ISDN Backup Circuit";
traceoptions {
flag all;
}
}
isdn-options {
switch-type ntdms100;
calling-number 344420;
}
dialer-options {
pool 1 priority 3;
}
}
dl0 {
description "Dialer Interface for ISDN";
enable;
traceoptions {
flag all;
}
hold-time up 60 down 60;
encapsulation multilink-ppp;
unit 0 {
ppp-options {
chap {
access-profile ntest-01;
local-name test-01;
}
}
family inet {
filter {
dialer ISDN;
}
address x.x.x.x/30;
}
dialer-options {
pool 1;
dial-string 132222224;
redial-delay 5;
idle-timeout 600;
load-threshold 75;
}
}
}
firewall {

dialer-filter ISDN {
term ISDN-TRAFFIC {
from {
destination-address {
x.x.x.x/24
}
}
then {
log;
note;
}
}
}
}
}
access {
profile test-01 {
client test-02 chap-secret "password"; ## SECRET-DATA
}
}




 
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 2020-10-04: Archive