ISDN log messages

Unanswered Question
Dec 10th, 2007
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hi,


I am seeing following log messages in my 1721 router. Can anybody tell me how to stop this or this is normal..


Dec 10 12:19:35.270: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0, TEI 102 change

d to up

Dec 10 12:19:45.298: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0, TEI 102 chan

ged to down

Dec 10 12:54:29.613: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0, TEI 87 changed

to up

Dec 10 12:54:39.629: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0, TEI 87 chang

ed to down

Dec 10 13:29:23.285: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0, TEI 80 changed

to up

Dec 10 13:29:33.365: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0, TEI 80 chang

ed to down

Dec 10 14:04:23.681: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0, TEI 81 changed

to up

Dec 10 14:04:33.701: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0, TEI 81 chang

ed to down


Regards

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shiva_ial Mon, 12/10/2007 - 06:27
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hi sagar,

the output shows there is frequent changes in layer 2 status of isdn

if you put sh isdn status command it will

show your isdn layer 2 status along with layer1&3


two options available in layer 2

multiframe estabilsed -means circuit is up till telco (your service provider)

tei_unassigned - means probelm connecting to your telco (your service provider)


to disable log use

no logging buffered command


rgds

shiva

rate it if it helps

sagar.shetty Mon, 12/10/2007 - 07:15
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Hi Shiva,


Thanks for your info... Actually, my isdn is a backup for a dedicated link which is currently up but still I am seeing these messages... Any idea, what could be this issue,...


Regards,

Richard Burts Mon, 12/10/2007 - 08:18
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Sagar


The logs indicate that the ISDN is coming up at various time intervals and is staying up for 10 seconds. It looks to me like something is making calls on the ISDN that last 10 seconds. If you run debug dialer through several of these occurances and post the output it might show us what is causing the ISDN to activate. It might also be helpful to see the output of debug isdn q931.


HTH


Rick

sagar.shetty Tue, 12/11/2007 - 21:38
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Hi Rick,


I tried the debugging commands but couldnot find any messages even the log showed only the above messages..


Thanks,

smothuku Tue, 12/11/2007 - 22:15
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Hi Sagar ,


Would like to know that whether the isdn is active link or standby link .


Can you send us the config of both the routers.


Can you send us "show isdn active" , show isdn status and show isdn his outputs.


Thanks,

satish



sagar.shetty Tue, 12/11/2007 - 22:40
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Hi,


Here's the ISDN config and the sh isdn o/p


interface BRI0

bandwidth 128

no ip address

encapsulation ppp

no ip route-cache cef

no ip route-cache

no ip mroute-cache

load-interval 30

dialer pool-member 1

isdn switch-type basic-net3

isdn point-to-point-setup

no fair-queue

no cdp enable

ppp authentication chap

ppp multilink

end


interface Dialer0

ip address X.X.X.X

encapsulation ppp

no ip route-cache cef

no ip route-cache

no ip mroute-cache

dialer pool 1

dialer remote-name abcd

dialer string 123456

dialer load-threshold 125 outbound

dialer-group 1

no cdp enable

ppp authentication chap

ppp multilink


dialer-list 1 protocol ip permit



--------------------------------------------------------------------------------

ISDN ACTIVE CALLS

--------------------------------------------------------------------------------

Call Calling Called Remote Seconds Seconds Seconds Charges

Type Number Number Name Used Left Idle Units/Currency

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------





--------------------------------------------------------------------------------

ISDN CALL HISTORY

--------------------------------------------------------------------------------

Call History contains all active calls, and a maximum of 100 inactive calls.

Inactive call data will be retained for a maximum of 15 minutes.

--------------------------------------------------------------------------------

Call Calling Called Remote Seconds Seconds Seconds Charges

Type Number Number Name Used Left Idle Units/Currency

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------


Also, to inform you, the ISDN is a backup for a serial link and it will get fired when the primary link goes down..


Thanks,

smothuku Wed, 12/12/2007 - 00:42
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Hi Sagar ,


Every thing looks fine..Below is the config of isan , which is backup for serial link.Please check it step by step and let me know if you miss something.


Router A:


username admin password cisco

Interface s0

ip add x.x.x.x

back delay 5 120

backup interface bri0


interface BRI0

bandwidth 128

encapsulation ppp

dialer pool-member 1

isdn switch-type basic-net3

isdn point-to-point-setup

ppp authentication chap

PPP chap hostname Router A hostname

ppp multilink

end


interface Dialer0

ip address X.X.X.X

encapsulation ppp

dialer pool 1

dialer remote-name abcd

dialer string 123456

dialer load-threshold 1 either

dialer-group 1

no cdp enable

ppp authentication chap

ppp chap hostname "outer A hostname"

ppp multilink


dialer-list 1 protocol ip permit


router B :


username admin password cisco


interface BRI0

bandwidth 128

encapsulation ppp

dialer pool-member 1

isdn switch-type basic-net3

isdn point-to-point-setup

ppp authentication chap

PPP chap hostname "Ruter Bhostname"

ppp multilink

end


interface Dialer0

ip address X.X.X.X

encapsulation ppp

dialer pool 1

dialer remote-name xxxx

dialer caller Router A number

dialer load-threshold 1 either

dialer-group 1

no cdp enable

ppp authentication chap

ppp chap hostname "outer A hostname"

ppp multilink


dialer-list 1 protocol ip permit



In the above config , call is connecting from Router A to Router B.


Remove backup interface command from serial and check the isdn status.


After that put the command under serial interface.



Please check the below link.


http://www.cisco.com/en/US/tech/tk801/tk379/technologies_configuration_example09186a00800b1148.shtml


Thanks,

satish

sagar.shetty Wed, 12/12/2007 - 04:16
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Hi Satish,


Thanks for you information...


Things look to be fine from the config pespective. But for the backup, I am using floating static route. Could that be the reason for this...


Thanks,

smothuku Wed, 12/12/2007 - 05:02
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Hi Sagar ,


No , it doesn't matter.We should have floating static route to forward the traffic in case of primary link fail.


If possible send me both the routers config.

Restart the NT boxes on both ends and check it.


Thanks,

satish

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