Problem With E1

Durrani, Mo mo.durrani at
Thu Feb 26 16:03:13 UTC 2009

If the router is cisco , you also wanna check the code and see if there
are any known bugs on the code track. We had a simmiliar issu with an
IOS and BGP. 
But , I do agree with Darel , as  well. 
	Mo Durrani
>TDS Telecom
>IP Network Engineering
	mo.durrani at

-----Original Message-----
From: Graham, Darel [mailto:Darel.Graham at] 
Sent: Thursday, February 26, 2009 6:51 AM
To: nanog at
Subject: RE: Problem With E1

Using an external CSU? Power cycle it. 
Using Frame Relay? Have provider check card in Frame switch, if the port
reads 65535 the buffers are full. Have the provider reset the card
(shared memory cards are bad). 

Without configuration info or other supporting info it will be difficult
to tell what the underlying issues are with OSPF/Ckt. Thanks Howard for
the push in the right direction.

DR Graham
-----Original Message-----
From: Howard C. Berkowitz [mailto:hcb at] 
Sent: Thursday, February 26, 2009 7:37 AM
To: nanog at
Subject: RE: Problem With E1

> -----Original Message-----
> From: Shivlu Jain [mailto:shivlu.jain at]
> Sent: Thursday, February 26, 2009 4:05 AM
> To: nanog at
> Subject: Problem With E1
> Since morning I am facing a issue in which one of E1 is configured 
> under OSPF. OSPF neighborship is up but not able to send and receive 
> the data. The configuration is plain vanila. Why it is happening so; I

> donot know?
> --
> Thanks & Regards
> shivlu jain
> 09312010137

If  this is an operational circuit, this is  a good example of why it
can extremely useful to document the working configuration of a
resource, so you can compare the malfunctioning configuration. The
document may well be stored as a file, and the comparison could be made
with diff or a similar utility.

Don't forget SNMP and NetFlow, both on the router, but also SNMP on the
access device, modem, multiplexer, etc. 

When that circuit first came up, I probably would have captured the
information from the router's equivalent of the Cisco commands:

* show interface
* show ip interface
* show ip ospf interface
* show ip ospf neigbors

Possibly show ip ospf database  and show ip ospf database neighbors;
perhaps save the routing table when storing those displays.

Even more displays could be useful, such as subinterfaces. 

Electrical tests, such as verifying the signal clocking and amplitude,
are usually last resorts -- although do verify that no one has moved the
cabling among router/CSU ports, and that everything has power.

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