Solved

Cisco 2600 router - basic ping questions

Posted on 2004-04-30
1
2,411 Views
Last Modified: 2013-11-29
I must've forgot how to setup a router.  My router has an ethernet port (E0) and two serial ports (S0 & S1) respectively.

IP's are configed and interfaces are up and I've set the bandwidth on S0 to 64000.

I can't ping from E0 to S0.  I use an extended ping which the target is the S0 IP from the source which is E0.

I get a strange response:   U.U.U.U

I've never seen U's before.  I've seen ! and . but never U's.

I've looked in the Cicso command reference files on the website and that response is not there.  In fact, it doesn't even say what a ! or a period means.

My questions are:
-What does a U mean?
-Is it the same as a period?
-What are the critical settings I need to get a serial interface working?

Martin
0
Comment
Question by:atenciom
1 Comment
 
LVL 28

Accepted Solution

by:
mikebernhardt earned 125 total points
ID: 10965027
The U means that the network is unreachable, whereas . means that the host is unreachable.

If you type "show ip interface brief" do you see the serial interface as up/up, up/down or down/down? Unless you've got a live link on the serial link it won't be up/up. Without up/up the network on that interface won't be up either, hence the network is unreachable.

You don't need a bandwidth statement on the serial interface, that is only used to customize routing metrics in some routing protocols. You might try "no keepalive" on the serial interface for now. That *might* bring it up, I'm not sure and can't try it right now.

If you have a DCE/DTE cable (I'm assuming you have a 2500 series router) you can configure a clock rate on your serial interface and simply cable it to the 2nd serial interface, no-shut the 2nd interface and that will bring up both of them. You don't need an IP address on the 2nd interface for this.
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

PRTG Network Monitor lets you monitor your bandwidth usage, so you know who is using up your bandwidth, and what they're using it for.
For many of us, the  holiday season kindles the natural urge to give back to our friends, family members and communities. While it's easy for friends to notice the impact of such deeds, understanding the contributions of businesses and enterprises i…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Internet Business Fax to Email Made Easy - With  eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, f…

813 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now