E1 Leased Line as primary link on VWIC-1MFT-E1 and backup on NM-1CE1T1-PRI

Unanswered Question
Aug 17th, 2007
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Dear All,

I am deploying a network using 3825 at cental location and 1841 at 3 branches.

Central Router has two PRI lines. One Channelized E1 line is terminated on VWIC-1MFT-E1 and other PRI line on NM-1CE1T1-PRI.

all Remote 1841 routers in branches has WIC-2T and WIC ? IB ? S/T ?V3. We have 64 kbps leased line as main link towards Central Office and ISDN BRI as backup link.

I want to establish connectivity from every branch to central loaction using

64 Kbps leased line and use BRI as backup if primary link fails.

Kindly help me for configuration of Central router and 3 remote routers.

Any help on this will be highly appreciated.

Thanks in advance,

Best Regards,


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Overall Rating: 3 (1 ratings)
sagiterian.archer Fri, 08/17/2007 - 04:46
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Dear Narayan,

Thanks for your responce but the above link is helpful for BRI to BRI Point to Point connectivity whether in my case connectivity is point to multipoint, ie multiple BRI to Central PRI. Also I need to configure main link (Channelized E1)to connect with 64 kbps leased line at branches as primary link.

Best Regards,


paolo bevilacqua Fri, 08/17/2007 - 04:56
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the configuration is very much the same for PRI or BRI, only in the first case there are no bri related commands. In both cases you configure a dialer interface where you put the needed IP settings.

For the channelize E1, under controller E1, configure multiple channel-group with increasing ID and the corresponding timeslot. This will create the serial interfaces where you put the IP addresses.

Hope this helps, please rate post if it does!

sagiterian.archer Wed, 08/29/2007 - 01:29
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Dear p.bevilacqua

Thanks for the response but now when I am connecting cable to E1 port (VWIC-1MFT-E1) E1 is not coming up following is the output of running config and show controller




enable secret xxx


no aaa new-model


resource policy


network-clock-participate wic 1

network-clock-select 1 E1 0/1/0

ip subnet-zero

ip cef





isdn switch-type primary-net5




controller E1 0/1/0

framing NO-CRC4

channel-group 0 timeslots 16

channel-group 1 timeslots 1

channel-group 2 timeslots 2

channel-group 3 timeslots 3

channel-group 4 timeslots 4

channel-group 5 timeslots 5

channel-group 6 timeslots 6

channel-group 7 timeslots 7

channel-group 8 timeslots 8

channel-group 9 timeslots 9

channel-group 10 timeslots 10

channel-group 11 timeslots 11

channel-group 12 timeslots 12

channel-group 13 timeslots 13

channel-group 14 timeslots 14

channel-group 15 timeslots 15


following is the ouput of show controller e1

Router#show controlle e1

E1 0/1/0 is down.

Applique type is Channelized E1 - balanced

Receiver has remote alarm.

alarm-trigger is not set

Version info Firmware: 20050620, FPGA: 16, spm_count = 0

Framing is NO-CRC4, Line Code is HDB3, Clock Source is Line.

CRC Threshold is 320. Reported from firmware is 320.

Data in current interval (421 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 421 Unavail Secs

Total Data (last 24 hours)

0 Line Code Violations, 0 Path Code Violations,

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 86400 Unavail Secs

Kindly help me by providing the resolution.

Thanks and Regards,



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