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AT&T T1 Installation Line down, it seems

Posted on 2011-09-29
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Last Modified: 2013-12-14
Hello there.

Could somebody tell me if this is a problem that AT&T has to fix or do I really don't know what I am doing?

When I connect the Router (Cisco 1841) to the Demarc I can see the activity on both ends but when trying to start configuring the office's network, I get no access to the Internet. On the router I see:



MISWAL01#
MISWAL01#sh ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.10.10.10     YES TFTP   administratively down down
FastEthernet0/1            unassigned      YES TFTP   administratively down down
Serial0/0/0                12.*.*.246   YES TFTP   up                    up  
MISWAL01#ping
*Sep 27 22:05:52.423: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0, changed state to
MISWAL01#
MISWAL01#
MISWAL01#
MISWAL01#ping 12.*.*.245

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 12.*.*.245, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
MISWAL01#
*Sep 27 22:06:30.823: %LINK-3-UPDOWN: Interface Serial0/0/0, changed state to down
MISWAL01#
MISWAL01#
MISWAL01#
*Sep 27 22:06:53.099: %LINK-3-UPDOWN: Interface Serial0/0/0, changed state to up
*Sep 27 22:06:54.099: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0, changed state to upping 12.*.*.245

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 12.*.*.245, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
MISWAL01#
*Sep 27 22:07:22.423: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0, changed state to down
MISWAL01#


Is this a line down?

Also, Is it a must to connect the US Robotics modem that send attached with the router?  If yes, how?

After all is working, I am adding a small Netgear switch.  Schematics and pics are a plus!

Thank you in advance!
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Question by:IDMA
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LVL 22

Assisted Solution

by:eeRoot
eeRoot earned 250 total points
ID: 36884481
Sounds like this router's uplink is not configured.  What type of connection is AT&T providing?  DSL, T1, MPLS, etc?  Did AT&T provide any info on the connection's settings?  IP address, DHCP available, etc.  And which port on the router is the AT&T connection plugged into?
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Author Comment

by:IDMA
ID: 36891109
The connection is a T1

We were provided the WAN Link IP Address, AR Serial INT IP Address, CR Serial INT IP Address and the WAN Link SUbnet Mask.

The port that it connectes to in the router is F0/0

We noticed that our side interface counters keeps the keepalives in count, and the Carried Detect (CD) led is steady green. During the up/up status we try pinging to the wan side of the serial line without success.
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LVL 22

Expert Comment

by:eeRoot
ID: 36895012
Can you post a sanitized config from you 1841?
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Accepted Solution

by:
IDMA earned 0 total points
ID: 36962054
All fixed now.  After 4 days of re-scheduling from wonderful AT&T, the tech realized that they shipped the router without the encapsulation (PPP) configured.  Go figure...

Thanks, eeRoot for the attention.

IDMA.
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Author Closing Comment

by:IDMA
ID: 36984574
It pointed me into the right direction in order to resolve the issue.
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Author Comment

by:IDMA
ID: 36962231
Thank you!
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Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

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