Input and CRC Errors on Cisco 2950

hard code the speed to 100 on the router as well. This may not be causing all your issues, but those settings should match, i.e. auto on one side and 100 on the other is not good, even though the link will work, it will cause errors.

That the errors are only happening in one direction would suggest it's not a cable problem, but you could still swap it out just to be sure.

I agree with setting both to 100 and full duplex. I have expierenced this problem before.

It is weired , my router does not allow me to set the speed.
speed command is unknown.

Following is the show version:

Cisco Internetwork Operating System Software
IOS (tm) 7200 Software (C7200-JS-M), Version 12.2(12), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Tue 20-Aug-02 23:43 by pwade
Image text-base: 0x60008940, data-base: 0x61650000

ROM: System Bootstrap, Version 12.1(20000914:181332) [bwhatley-npe200 102], DEVE
LOPMENT SOFTWARE
BOOTLDR: 7200 Software (C7200-BOOT-M), Version 12.0(13)S, EARLY DEPLOYMENT RELEA
SE SOFTWARE (fc1)

Cisco-gw uptime is 12 weeks, 4 days, 1 minute
System returned to ROM by power-on
System image file is "slot0:c7200-js-mz.122-12.bin"

cisco 7206VXR (NPE200) processor (revision B) with 57344K/8192K bytes of memory.
Processor board ID 23684896
R5000 CPU at 200Mhz, Implementation 35, Rev 2.1, 512KB L2 Cache
6 slot VXR midplane, Version 2.3

Last reset from power-on
Bridging software.
X.25 software, Version 3.0.0.
SuperLAT software (copyright 1990 by Meridian Technology Corp).
TN3270 Emulation software.
Primary Rate ISDN software, Version 1.1.
4 FastEthernet/IEEE 802.3 interface(s)
2 Serial network interface(s)
4 Channelized T1/PRI port(s)
125K bytes of non-volatile configuration memory.

20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K).
4096K bytes of Flash internal SIMM (Sector size 256K).
Configuration register is 0x2102

then set the switch to auto speed. Both sides should match.

I agree with chipk: set both sides to AUTO.

For some reason line protocol goes down if i make the speed to auto in switch.

Did you do the switch first? Was it doing this with the router set to auto, or is the router still manually configured for 100/full?

I am not very expert in cisco.

I tried to do the following on the router:

*****************************************************
Cisco-gw#config t
Enter configuration commands, one per line. End with CNTL/Z.
Cisco-gw(config)#int f1/0
Cisco-gw(config-if)#speed?
% Unrecognized command
****************************************************

When I tried to change the speed to AUTO on switch, the interface and line protocol goes down. Luckly I was having access to the switch via the serial port otherwise I would have been in a big mess.

Thanks

Hmm....something is odd here, and I think it's the FastEthernet hardware on the 7200, or it's the IOS level. It's possible that the speed can't be changed on that interface. It may be permanently set to 100. If so, just type "no duplex" to set the duplex back to default.

do a show interface fa1/0 and post the entire output.

jneiberger : Duplex is already same at both the ends.

Cisco-gw#show int fa1/0
FastEthernet1/0 is up, line protocol is up
Hardware is DEC21140A, address is 0006.2a6e.781c (bia 0006.2a6e.781c)
Internet address is xxx.xxx.xxx.xxx/30
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 12/255, rxload 14/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 02:08:23
Input queue: 0/75/14/5 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue :0/40 (size/max)
5 minute input rate 5789000 bits/sec, 8989 packets/sec
5 minute output rate 4892000 bits/sec, 7227 packets/sec
68118307 packets input, 1170702644 bytes
Received 6503 broadcasts, 0 runts, 0 giants, 2 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
52195993 packets output, 28292994 bytes, 1653 underruns
1653 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Cisco-gw#

Here is the info from switch

cisco_2950#show int f0/18
FastEthernet0/18 is up, line protocol is up
Hardware is Fast Ethernet, address is 000a.b7e0.3552 (bia 000a.b7e0.3552)
MTU 1500 bytes, BW 100000 Kbit, DLY 1000 usec,
reliability 255/255, txload 15/255, rxload 13/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s
input flow-control is off, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:00, output hang never
Last clearing of "show interface" counters 02:11:37
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 5176000 bits/sec, 7262 packets/sec
5 minute output rate 6059000 bits/sec, 8974 packets/sec
53385634 packets input, 353330385 bytes, 0 no buffer
Received 13 broadcasts, 0 runts, 0 giants, 0 throttles
1674 input errors, 1674 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 13 multicast, 0 pause input
0 input packets with dribble condition detected
69603039 packets output, 1576238342 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
cisco_2950#

If you just do a "?" at interface config on the router, do you see anything remotely resembling a speed setting command?

And just to verify you are having an autonegotiation mismatch, try the following command on the switch:

show controllers ethernet-controller fa0/18

Look for a line that says FCS errors.

I already tried that and I did not find any command related to speed.

Yes, there are FCS errors.

Cisco_2950#show controllers ethernet-controller fa0/18

Transmit Receive
3284917454 Bytes 41013183 Bytes
1812659874 Frames 2176935010 Frames
20560865 Multicast frames 2041263 FCS errors
25489219 Broadcast frames 29016 Multicast frames
0 Pause frames 7775 Broadcast frames
6737 Single defer frames 0 Control frames
0 Multiple defer frames 0 Pause frames
1975 1 collision frames 0 Unknown opcode frames
3110 2-15 collisions 1 Alignment errors
808 Late collisions 0 Length out of range
0 Excessive collisions 0 Symbol error frames
11268 Total collisions 22 False carrier errors
0 Control frames 0 Valid frames, too small
0 VLAN discard frames 0 Valid frames, too large
0 Too old frames 1 Invalid frames, too small
0 Tagged frames 0 Invalid frames, too large
808 Aborted Tx frames 108119163 Discarded frames

Transmit and Receive
3006450056 Minimum size frames
1328462799 65 to 127 byte frames
2937898104 128 to 255 byte frames
204972790 256 to 511 byte frames
206766331 512 to 1023 byte frames
600011291 1024 to 1518 byte frames
0 1519 to 1522 byte frames
Cisco_2950#

Do you see the late collisions in that last output? That proves you have a duplex mismatch. It *is* possible to get a duplex mismatch even if you manually set duplex on both sides. That's why we're recommending that you set both sides to auto.

I changed the duplex to "no duplex" at both the ends. Error count is still increasing.

Okay. Which error counters specifically are increasing?

Also, you've probably already done this, but you might want to try a new patch cable just in case.

Router: Only output errors are increasing.
Switch: CRC and Input errors are increasing.

You are right, We have already tried replacing the cable, changing the port on the switch, powercycling the switch.
Nothing has helped so far.

One thing I am not sure about is that *where* is the problem?

Is it the switch?
or
Is it the router?

I may be heading to the site in next 2 hours, I have a spare switch cisco2950, I will try replacing the switch and see if it helps.

Thanks.