09-18-2012 05:57 AM - edited 03-07-2019 08:56 AM
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!
09-18-2012 06:08 AM
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
Don't forget to rate helpful posts.
09-18-2012 06:14 AM
Hi,
DCE 530, clock rate 64000
The cable needs to be V.35.
Is this back-to-back V.35 cable (60Pins)?
HTH
09-18-2012 06:21 AM
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
09-18-2012 06:37 AM
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.
09-18-2012 06:45 AM
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!
09-18-2012 06:48 AM
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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