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Webcast-Catalyst9k
New Member

Need Help with connecting to routers . . . .

Hi,

I am having a problem of connecting to some routers. I have attachted a picture of what I have laid out but I am starting to learn how to do this type of stuff, since I am in college. Any help will be much appreciated.

9 REPLIES
New Member

Re: Need Help with connecting to routers . . . .

I know how to do the commands, but my problem lies with the serial ports (s0 and s1). These serial ports go up then go back down. They don't stay up. What am I doing wrong?

int s0

ip address 126.110.10.5 255.0.0.0

no shut

Message shows status is up, then a minute the status goes down.

Confused ?

New Member

Re: Need Help with connecting to routers . . . .

do you have one inerface setup as the dce and the other as the dte?

New Member

Re: Need Help with connecting to routers . . . .

I tried to setup clocking but the alive time is 10sec and by the time I get into the other right it times out. I have two terminals that are suppose to see each other through 5 routers.

I am confused as how to go about connecting this up since my ethernet ports work but my serial ports don't?

About DCE and DTE, I know what they are but I am having a problem as how to setup that up as well.

Confused ????

New Member

Re: Need Help with connecting to routers . . . .

Hi,

I have figured out how to get the ethernet ports working on each router and they are seeing each other. But I am experiencing a problem with the serial ports. Here is what I got as an error message.

Serial0 is up, line protocol is down.

and I also get this one.

Serial1 is up, line protocol is down.

I am trying to configure 2611 cisco routers and 2 PC's on a network simulator.

The PC's and some of the routers are ethernet and some are serial.

Any advice or help is much appreiciated.

Thanks in advance.

Denise

Cisco Employee

Re: Need Help with connecting to routers . . . .

sh controllers serial 0/0/0

!

Gives me this output

Interface Serial0/0/0

Hardware is HWIC-Serial

DTE V.35

Notice this is a DTE interface, if the other end is a DCE interface I need to provide clocking on that router only:

clock rate 64000

!

Now I need to configure encapsulation. HSDL is the default cisco encapsulation, but I am going to configure PPP:

encapsulation PPP

!

*Oct 5 16:53:02.626: %LINK-3-UPDOWN: Interface Serial0/0/0, changed state to up

Now apply my IP addresses and test

int s0/0/0

ip address 192.168.0.1 255.255.255.0

exit

!

ping 192.168.0.2

!

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.0.2, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 56/57/60 ms

Now I can take it to the next level with authentication (either pap or chap) I am going to configure chap since it is the most secure:

R1:

ppp authentication chap

ppp chap hostname R1

ppp chap password CISCO

!

username R2 password CISCO

R2:

ppp authentication chap

ppp chap hostname R2

ppp chap password CISCO

!

username R1 password CISCO

Ping again to test, if I have trouble debug:

debug ppp authentication

!

New Member

Re: Need Help with connecting to routers . . . .

What if your device is showing HD with numbers in the end?

What type of device shows that it is a DTE or a DCE device?

If it does'nt how do you change it?

I have been looking at this for about 2 days and I am somewhat still confused.

Please post any help, your help will be much appreciated.

Thanks in advance.

Denise

Cisco Employee

Re: Need Help with connecting to routers . . . .

What if your device is showing HD with numbers in the end?

>>Can you post your output and I will try to explain

What type of device shows that it is a DTE or a DCE device?

>>When you have serial interfaces connected back to back (that is directly connected with a cable) one end of the cable is physically wired as a DCE and the other is wired as a DTE. The DCE end needs to supply clocking. See these links:

http://www.cisco.com/en/US/tech/tk713/tk317/technologies_configuration_example09186a00800944ff.shtml

http://www.cisco.com/warp/public/116/ppp_back.html

http://www.cisco.com/en/US/tech/tk713/tk237/technologies_configuration_example09186a0080094a3c.shtml

If it does'nt how do you change it?

It looks like you're using a simulator for practice, in this case both ends may appear to be DTE, so you wouldn't need to enable clocking.

New Member

Re: Need Help with connecting to routers . . . .

I am using a simulator that was given to me for practice.

I am trying to get the serial ports and the line protocol both up. If they are both up, I will be able to connect to the other devices such as routers and PCs.

Here is the information I get.

Router# show interface serial 0

Serial0 is up, line protocol is down.

Hardware is HD64570

Internet address is 126.110.0.5/8

MTU 1500 bytes, BW 1544 Kbit, DLY 1000 usec, rely 255/255, load 1/255

Encapsulation PPP, Loopback not set, keepalive set (10 sec)

LCP ACKRCVD

Closed: IPCP, CDPCP

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of show interface counters never

Queueing strategy: fifo

Queueing queue 0/40, 0 drops; input queue 0/75, 0 drops

5 minute input rate 1000 bits/sec, 2 packets/sec

5 minute output rate 1000 bits/sec, 2 packets/sec

0 packets input, 0 bytes, 0 no buffer

Recieved 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input erorrs, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

0 input packets with dribble condtion detected

0 packets output, 0 bytes, 0 overruns

0 output errors, 0 collisions, 0 interface resets

0 bables, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

Cisco Employee

Re: Need Help with connecting to routers . . . .

you need to use the: sh controllers serial 0 command to see the cable type. This is the wrong command.

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