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Beginner

Serial interface not working!

Hi. I just recently bought a new Cisco 2611 for my home lab and am having trouble getting the serial port to work. I have tried multiple things such as erase startup, switching the cables to rule them out, and even changing IP addresses but none worked. The port may be dead but I thought I would see if anyone could see anything else to try before I replaced it. Here is the output I am getting:

Router#show controllers

Interface Serial0/0

Hardware is PowerQUICC MPC860

DCE 530, clock rate 64000

idb at 0x84C4310C, driver data structure at 0x84C4A830

SCC Registers:

General [GSMR]=0x2:0x00000030, Protocol-specific [PSMR]=0x8

Events [SCCE]=0x0300, Mask [SCCM]=0x001F, Status [SCCS]=0x03

Transmit on Demand [TODR]=0x0, Data Sync [DSR]=0x7E7E

Interrupt Registers:

Config [CICR]=0x00367F80, Pending [CIPR]=0x00000000

Mask   [CIMR]=0x40204000, In-srv  [CISR]=0x00000000

Command register [CR]=0x600

Port A [PADIR]=0x0100, [PAPAR]=0xFFFF

       [PAODR]=0x0000, [PADAT]=0xF6FF

Port B [PBDIR]=0x0180F, [PBPAR]=0x0000E

       [PBODR]=0x00000, [PBDAT]=0x3E7FD

Port C [PCDIR]=0x00C, [PCPAR]=0x000

       [PCSO]=0x020,  [PCDAT]=0xFF2, [PCINT]=0x00F

Receive Ring

        rmd(680126B0): status 9000 length 60C address 7CEAD24

        rmd(680126B8): status 9000 length 60C address 7CEA6A4

        rmd(680126C0): status 9000 length 60C address 7CEA024

        rmd(680126C8): status 9000 length 60C address 7D09764

Router#show int serial0/0

Serial0/0 is down, line protocol is down

  Hardware is PowerQUICC Serial

  Internet address is 192.168.1.2/24

  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 00:31:45

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  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, 47 interface resets

     0 unknown protocol drops

     0 output buffer failures, 0 output buffers swapped out

     0 carrier transitions

     DCD=up  DSR=up  DTR=down  RTS=down  CTS=up

Router#debug serial int

Serial network interface debugging is on

Router#

*Mar  1 01:15:50.410: Serial0/0: attempting to restart

*Mar  1 01:16:20.412: Serial0/0: attempting to restart

*Mar  1 01:16:50.413: Serial0/0: attempting to restart

*Mar  1 01:17:20.414: Serial0/0: attempting to restart

*Mar  1 01:17:50.415: Serial0/0: attempting to restart

*Mar  1 01:18:20.416: Serial0/0: attempting to restart

*Mar  1 01:18:50.417: Serial0/0: attempting to restart

*Mar  1 01:19:20.419: Serial0/0: attempting to restart

*Mar  1 01:19:50.420: Serial0/0: attempting to restart

*Mar  1 01:20:20.421: Serial0/0: attempting to restart

*Mar  1 01:20:50.450: Serial0/0: attempting to restart

Router#show run

Building configuration...

Current configuration : 733 bytes

!

version 12.4

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname Router

!

boot-start-marker

boot-end-marker

!

!

no aaa new-model

no network-clock-participate slot 1

no network-clock-participate wic 0

ip cef

!

!

!

!

ip auth-proxy max-nodata-conns 3

ip admission max-nodata-conns 3

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

!

interface FastEthernet0/0

ip address 10.0.0.2 255.255.255.0

duplex auto

speed auto

!

interface Serial0/0

ip address 192.168.1.2 255.255.255.0

no fair-queue

clock rate 64000

!

ip forward-protocol nd

!

!

ip http server

no ip http secure-server

!

!

!

!

control-plane

!

!

!

!

!

!

!

!

!

!

line con 0

line aux 0

line vty 0 4

!

!

end

Any help is greatly appreciated! Thanks!

Everyone's tags (4)
6 REPLIES 6
Highlighted
Advisor

Serial interface not working!

Hi,

Serial0/0 is down, Line Protocol is down

DCD=up DSR=up DTR=down RTS=down CTS=up

This indicates that the DTE router is down or a media problem.

Regards.

Alain

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Highlighted
VIP Expert

Re: Serial interface not working!

Hi,

DCE 530, clock rate 64000

The cable needs to be V.35.

Is this back-to-back V.35 cable (60Pins)?

HTH

Highlighted
Hall of Fame Expert

Serial interface not working!

Hello Cory,

the clock rate command for OSI Layer 1 DCE operations has to be given on the router that has the DCE cable directly connected to it.

This looks like to be your case

>> DCE 530, clock rate 64000

Here, what we see is that all state leads that should come from the DTE device are down

>> DCD=up  DSR=up  DTR=down  RTS=down  CTS=up

For this the interface is kept down/down and attempts to restart from time to time.

I suppose you have another router with a serial interface and a DTE cable interconnected to this router.

The V.35 DCE (female) to DTE (male) connection requires that you close completely the screws or it fails to build the electrical connection. There must be no gap left between the two connectors they must touch each other.

see

Hope to help

Giuseppe

Highlighted
Beginner

Serial interface not working!

This is the serial cable I am using. Yes I am connecting it to another router. I have tried both ways but currently have the DCE end plugged in to the port I suspect is not working. I have narrowed it down to this port because when I use the serial port on the second router connected to a third, it works.

Highlighted
Beginner

Serial interface not working!

I have resolved the issue. I took the interface out and simply put it back in and now it works. Thanks for your help everyone!

Highlighted
Hall of Fame Expert

Re: Serial interface not working!

Hello Cory,

May I ask you what is the part number of the cable you are using ?

Edit:

good that you have solved you have reseated the serial interface in the router .

Hope to help

Giuseppe

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