08-03-2007 10:29 PM
Hello,
i have a remote site that have two WAN lines, one primary and the another is Backup ISDN (PPP), MY points is about the ISDN line i have made a configuration as the following:
interface BRI0/0/0
no ip address
encapsulation ppp
dialer pool-member 1
isdn switch-type basic-net3
ppp authentication chap
!
interface Serial0/1/0
bandwidth 256
ip address 10.1.2.2 255.255.255.252
ip route-cache flow
service-policy output QoS-Policy
ip rtp header-compression
ip rtp priority 32000 1000 80
!
interface Virtual-Template1
no ip address
ppp multilink
ppp multilink interleave
ppp multilink fragment delay 20
ip rtp reserve 32000 1000 64
!
interface Vlan1
no ip address
no snmp trap link-status
!
interface Dialer1
ip address 192.168.99.14 255.255.255.252
encapsulation ppp
dialer pool 1
dialer remote-name cr-02
dialer idle-timeout 500
dialer string XXXX400
dialer load-threshold 128 either
dialer-group 1
no snmp trap link-status
no cdp enable
ppp authentication chap
!
router eigrp 1
network 10.0.0.0
network 192.168.99.0
no auto-summary
eigrp stub connected
!
ip route 0.0.0.0 0.0.0.0 10.100.1.1
ip route 0.0.0.0 0.0.0.0 192.168.99.13 20
But when the primary link is down the ISDN link doent come up, i tried to make a debugging it give me the following messege :
*Aug 4 06:42:27.275: ISDN BR0/0/0 **ERROR**: handle_l2d_srq_mail: Layer 1 inactive.
*Aug 4 06:42:29.507: ISDN BR0/0/0 Q921: L2_EstablishDataLink: sending SABME
*Aug 4 06:42:29.527: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/0/0, TEI 95 changed to up
*Aug 4 06:42:29.639: ISDN BR0/0/0 **ERROR**: host_disconnect_ack: Call rejected cause No circuit/channel available(0x22) call id 0x818D.
*Aug 4 06:42:31.271: ISDN BR0/0/0 Q931: Applying typeplan for sw-type 0x1 is 0x0 0x0, Called num XXXX400
*Aug 4 06:42:31.375: ISDN BR0/0/0 **ERROR**: host_disconnect_ack: Call rejected cause No circuit/channel available(0x22) call id 0x818E.
*Aug 4 06:42:33.271: ISDN BR0/0/0 Q931: Applying typeplan for sw-type 0x1 is 0x0 0x0, Called num XXXX400
*Aug 4 06:42:33.375: ISDN BR0/0/0 **ERROR**: host_disconnect_ack: Call rejected cause No circuit/channel available(0x22) call id 0x818F.
*Aug 4 06:42:35.271: ISDN BR0/0/0 Q931: Applying typeplan for sw-type 0x1 is 0x0 0x0, Called num XXXX400
*Aug 4 06:42:35.375: ISDN BR0/0/0 **ERROR**: host_disconnect_ack: Call rejected cause No circuit/channel available(0x22) call id 0x8190.
Success rate is 0 percent (0/5)
ar-BRH#
*Aug 4 06:42:50.375: %ISDN-6-LAYER2DOWN: Layer 2 for Interface BR0/0/0, TEI 95 changed to down
*Aug 4 06:42:50.383: ISDN BR0/0/0 Q931: Ux_DLRelInd: DL_REL_IND received from L2
ar-BRH#
*Aug 4 06:43:00.967: ISDN BR0/0/0 Q931: L3_ShutDown: Shutting down ISDN Layer 3
*Aug 4 06:43:00.971: ISDN BR0/0/0 Q931: Ux_DLRelInd: DL_REL_IND received from L2
Kindlly your help
THanks
08-04-2007 04:01 PM
Where is BACKUP INTERFACE DIELAR1 Command on Serial 0 Interface.
How Serial interface will know about... Dialer interface is there?
See detail of Backup ISDN configuration exaples:
http://www.cisco.com/en/US/tech/tk801/tk379/technologies_configuration_example09186a0080093c7d.shtml
Regards,
Dharmesh Purohit
08-04-2007 08:35 PM
Dharmesh
I do not believe that the original poster intended to use backup interface, and I do not believe that backup interface is necessarily needed here. The floating static default route points to the dialer interface:
ip route 0.0.0.0 0.0.0.0 10.100.1.1
ip route 0.0.0.0 0.0.0.0 192.168.99.13 20
and if the primary static default route is withdrawn the router will begin sending traffic to the dialer.
I do note that in the amount of configuration shown I do not see a way to get to 10.100.1.1 and so there may be a problem with the primary static default route. Or it may be that the address is reachable through some interface not shown in the posted config.
I believe that there is a more fundamental problem shown in the original post. One of the lines indicates that layer 1 is not active. If layer 1 is not active then nothing can be sent over this interface. Perhaps we could have posted the output of show isdn status. This would clarify the status of layer 1 and layer 2 for the ISDN.
HTH
Rick
08-04-2007 10:02 PM
the 10.100.1.1 can be reach through Eigrp so there is no problem of the primary static route, but when i ping the other peer for the isdn 192.168.99.13 the layer 1, and 2 will be active before that it will be deactive
ar-BRH#sh isdn status
Global ISDN Switchtype = basic-dms100
ISDN BRI0/0/0 interface
dsl 0, interface ISDN Switchtype = basic-net3
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 101, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 0 CCBs = 0
The Free Channel Mask: 0x80000003
Total Allocated ISDN CCBs = 0
ar-BRH#
thanks
08-05-2007 12:44 AM
Hi Rick,
In almost all part of the world (with the notable exception of North America), the telco switch deactivates L1 and L2 on the S/T bus of ISDN BRI circuits, after few seconds of inactivity. I never got to understand in full why is that, but so it is.
As soon an incoming or outgoing call is attempted, both L1 and L2 are reactivated.
Only recently, ISDN code in IOS has began to address this situation better than before, with the command "isdn tei-negotiation preserve". This way, no time is lost in obtaining a TEI every time the link reactivates.
08-05-2007 12:38 AM
Darmesh,
As I told you already in some other occasion, "backup interface" is not the only method of configuring backup over ISDN.
In fact,it is a limiting mechanism that does not address all the situations.
So please do not assume that all the installations are the same and there is only of way of configuring things.
08-05-2007 02:14 AM
do you any solution for my case
thanks
08-05-2007 02:52 AM
Hi,
seems to me the call is refused by telco. Collect debug isdn q931 to confirm.
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