2610 router for lab, can't ping its own s0/0

Answered Question
Dec 14th, 2009
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I just bought 3 x 2610 routers for a lab. Each of the above has a T1 DSU/CSU and an Ethernet card. 


I gave the s0/0 int an IP and subnet mask yet not able to ping the int from the router.  Any advise would be appreciated.


00:12:56: %SYS-5-CONFIG_I: Configured from console by console
ping 192.168.1.1


Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Router#sh run
Building configuration...


Current configuration : 395 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
hostname Router
ip subnet-zero

interface Ethernet0/0
no ip address
shutdown
half-duplex
!
interface Serial0/0
ip address 192.168.1.1 255.255.255.0
ip classless
ip http server
ip pim bidir-enable
line con 0
line aux 0
line vty 0 4
!
no scheduler allocate
end

Correct Answer by Ganesh Hariharan about 7 years 7 months ago

Check out the following pre-requisite as your serial interface is howing down !!


Interface Serial0/0 (down/down)
  WARNING: This interface is down.
  This is related to hardware issue or physical connection failure.
  TRY THIS: Follow the following procedure.
  1. Make sure that you have connected serial cable from router interface to CSU/DSU
     and RJ45 straight cable from CSU/DSU to service provider's wall jack or patch
     panel.
  2. Check the LEDs on the CSU/DSU to see whether the Carrier Detect (CD) is active.
     If not, confirm with the service provider that the link is active by giving
     a loop test.
  3. If the link is still down, try with another serial interface. If the link comes
     up now, it indicates that the previous interface was faulty.
  4. If the link is still down, try running a loop test from the CSU/DSU towards
     the router. Once it is in loop, issue a 'show int serial' command, and verify
     that the interface status is UP/UP (looped) now.
  5. Now try and ping your own interface. If you are not able to see the status
     as 'UP/UP (Looped)' and not able to ping your own interface, this might indicate
     a hardware problem.
  Note: As this interface is down, the counter values analyzed by Output Interpreter
  might not reflect the current condition.


Regards

Ganesh.H

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Ganesh Hariharan Tue, 12/15/2009 - 01:30
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Is the line protocol is up in serial interface kindly share output  show int s0/0 !!


Regards

Ganesh.H

saidfrh18 Tue, 12/15/2009 - 02:45
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Router#sh int s0/0
Serial0/0 is down, line protocol is down
  Hardware is PQUICC with Fractional T1 CSU/DSU
  Internet address is 192.168.1.1/24
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation HDLC, loopback not set
  Keepalive set (10 sec)
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 00:02:49
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/0/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1158 kilobits/sec
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 5 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
     DCD=down  DSR=up  DTR=up  RTS=up  CTS=down

Correct Answer
Ganesh Hariharan Tue, 12/15/2009 - 02:51
User Badges:
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    Member's Choice, February 2016

Check out the following pre-requisite as your serial interface is howing down !!


Interface Serial0/0 (down/down)
  WARNING: This interface is down.
  This is related to hardware issue or physical connection failure.
  TRY THIS: Follow the following procedure.
  1. Make sure that you have connected serial cable from router interface to CSU/DSU
     and RJ45 straight cable from CSU/DSU to service provider's wall jack or patch
     panel.
  2. Check the LEDs on the CSU/DSU to see whether the Carrier Detect (CD) is active.
     If not, confirm with the service provider that the link is active by giving
     a loop test.
  3. If the link is still down, try with another serial interface. If the link comes
     up now, it indicates that the previous interface was faulty.
  4. If the link is still down, try running a loop test from the CSU/DSU towards
     the router. Once it is in loop, issue a 'show int serial' command, and verify
     that the interface status is UP/UP (looped) now.
  5. Now try and ping your own interface. If you are not able to see the status
     as 'UP/UP (Looped)' and not able to ping your own interface, this might indicate
     a hardware problem.
  Note: As this interface is down, the counter values analyzed by Output Interpreter
  might not reflect the current condition.


Regards

Ganesh.H

jimmysands73_2 Thu, 02/04/2010 - 09:33
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Do you have a cable plugged in?  If its down/down you will not be able to ping it.  Give your PC a IP in

block of your serial int, set the SM on your pc as the same, then you should be able to ping it.

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