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Point To Point T1 Help

Posted on 2003-11-13
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Last Modified: 2010-04-17
We have just installed our first point to point T1 circuit.  We have 35+ frame-relay circuits and I am familiar with configuring the routers in this case but this will be my first endeavor with the basic point to point circuit.  Here are my questions:

1. With a frame circuit you can have one router plugged into the circuit without the other one being configured and you will not get an alarm.  I have extended my telco demarc to my router and I am getting an alarm.  The CSU is a cisco WIC1 DSU.  Is this the normal operation or should I contact Bellsouth for service on the line before I drive across town only to find out that the circuit has an issue?

2. For routing the network is basically as follows:
A - Core Host Router
     e0 10.1.1.101/24
     s0 (Not important as interface to Frame Cloud)
B - Secondary Host Router
     fa0 10.1.1.102/24
     s0 10.101.1.1/24
C - Remote Router
     e0 10.100.1.1/24
     s0 10.101.1.2/24

The question here is how to setup the routes... for the frame network which all interface to "A" we use eigrp.  Since this will be pretty static I was just going to configure the following static routes:
====================
A: 10.100.1.0/24 -> 10.1.1.102
A: 0.0.0.0 0.0.0.0 -> 10.1.1.254 (My Firewall)
====================
B: 10.100.1.0/24 -> 10.101.1.2
B: 0.0.0.0 0.0.0.0 -> 10.1.1.101
====================
C: 0.0.0.0 0.0.0.0 -> 10.101.1.1

Well with this setup currently obviously I have no serial interface because I havent brought the T1 up and if I do a tracert from my machine (gateway e0 on A) to 10.100.1.2 I get in a loop going back and forth from 10.1.1.101 and 10.1.1.102. I am thinking this is a bad thing ; ).

3. On the WIC1 I set one to clock internal and one to clock line right?

4. For encapsulation I generally use the line encap frame-relay.  Is it necessary to use an encap on the point to point line?

Thank you for your help in advance. I setup this question as 250 points because I need to get this going today. ; )

Note: The T1 in question is between B and C both are equipped with WIC1 CSU
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Question by:NTGuru705
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by:lrmoore
ID: 9740872
1. If the line is up, you should not get an alarm
What do you get from "show interface serial xx?

2. Your routing will work. You get in a loop because you have a static on one and a default on the other. Until the link comes up, you'll keep seeing that. Why not use EIGRP on both of these routers too?

3. Depends on the circuit. Some providers will provide clocking for both ends. I would start with both set to line

4. NO, don't use frame-relay encap. Use default HDLC or PPP. Default without specifying any encap is HDLC
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by:NTGuru705
ID: 9741095
This is good information...

the show int tells me the interface is administratively down and the line protocol is down.

So you are saying that I should not have an alarm on the WIC even if there is nothing on the other side.
I know that with the clocking I have to bring my own.. so one would be internal and one line.

I suppose I could use eigrp between them as well... can you explaing eigrp a bit for me.. ?Is there a way on the WIC1 to tell what the alrm is?
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Expert Comment

by:lrmoore
ID: 9741127
The alarm is because the interface is administratively down
Bring it up with a "no shutdown"

You can use EIGRP. Example uses EIGRP AS number 101 (same on all routers)
Rtr-A - core host
 router eigrp 101
  network 10.0.0.0
  no auto-summary

Rtr-B
 router eigrp 101
  network 10.0.0.0
  no auto-summary

Rtr-C
 router eigrp 101
  network 10.0.0.0
  no auto-summary

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by:NTGuru705
ID: 9741171
I am sorry I wasnt clear.. on the eigrp

I know how to configure it was just wondering about some negatives of using it (isnt it chatty?)

On the no shut.. i added that line and now it is just telling me the interface is down... and the line is down. And the ALM light is still on.
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by:lrmoore
ID: 9741463
EIGRP is not chatty like RIP.

If interface is down/down and you get DCD down also, then your DSU is not getting any signals on the T1. Is it a full T1, or fractional T?
Are you connecting directly to a smart jack, or an extension?
If it is a simple leased line with one end supposedly providing clocking, is the other end plugged in and turned on, and the interface "no shut" activated?

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by:NTGuru705
ID: 9741519
I just spoke with BS.  They stated that the alm was because both ends of the CPE were not installed.  This was question 1 on the original post perhaps I was not clear in my post.  At any rate I am going over to the remote site and will post back with my results.

It is a full t1

Thank you for your help this far.
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by:NTGuru705
ID: 9741530
So with eigrp the router advertises its interfaces?
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by:lrmoore
ID: 9741551
Yes, as long as all the interfaces are covered in the network statements.
In your case
network 10.0.0.0  covers all of your interfaces...
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by:NTGuru705
ID: 9743348
Got the circuit up the only problem that I had was the circuit needed equipment on both ends... other than that everything seems to be ok.

Thank you for your support on this issue and for the eigrp lesson.  One more thing.. is there a way from the console to see the alarm on the CSU card?
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lrmoore earned 250 total points
ID: 9744177
Glad you're up!

About the only way to see anything on the router console is from "show interface" and/or "show controller"
If you have an snmp management station, you can get alarm traps...
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by:NTGuru705
ID: 9845043
Got it going thank you very much for your help lrmoore
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