Connection reset

[aap78]

Hi,

Over last few weeks we are having intermittent difficulties in

connecting to unix/microsoft servers, where our e mails and Microsoft documents are stored. We will get notices on pcs, that we are no longer connected to server, and after a few minutes or so, will be reconnected.

It seems to be happening with increased frequency recently. We have already changed the ports on catalyst 2950 but even then the issue is there.

Any idea on what this might be ? something to do with catalyst switch or servers itself ?

Thanks in advance !

Ade

[ankurbhasin]

Hi Ade,

Can you check the interface on which the servers are connected, do you see some errors incrementing.

It could be mostly a physical layer issue. Try to hard core the speed and duplex settings on the server and the switch and if that does not resolve your problem then try changing the cable between switch and the server.

Regards,

Ankur

[aap78]

Hi Ede,

The servers were connected with fasthethernet ports 1 and 2. I swapped these with ports 18 and 19 and below are the interface outputs for your further advice.

*************************************************

FastEthernet0/18 is up, line protocol is up (connected)

Hardware is Fast Ethernet, address is 000e.d6e5.b122 (bia 000e.d6e5.b122)

MTU 1500 bytes, BW 100000 Kbit, DLY 1000 usec,

reliability 255/255, txload 1/255, rxload 1/255

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 never

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 154000 bits/sec, 4 packets/sec

5 minute output rate 86000 bits/sec, 3 packets/sec

1277025 packets input, 586468984 bytes, 0 no buffer

Received 8186 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 141 multicast, 0 pause input

0 input packets with dribble condition detected

2063446 packets output, 569549687 bytes, 0 underruns

0 output errors, 0 collisions, 2 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

FastEthernet0/19 is up, line protocol is up (connected)

Hardware is Fast Ethernet, address is 000e.d6e5.b163 (bia 000e.d6e5.b163)

MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 10Mb/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 never

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 3000 bits/sec, 2 packets/sec

5 minute output rate 2000 bits/sec, 3 packets/sec

299994 packets input, 116811779 bytes, 0 no buffer

Received 17958 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 89 multicast, 0 pause input

0 input packets with dribble condition detected

861348 packets output, 173272630 bytes, 0 underruns

0 output errors, 0 collisions, 2 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

****************************************************

When I take the show logg command then I can`t see any errors that are related with the particular fastethernet interfaces. What do u means by hard core the speed and duplex settings ? Above outputs are showing different duplex speed i.e. 100MB/sec and 10MB/sec.

Looking forward for your immediate advice.

Thanks in advance.

Ade

[amit-singh]

Ade,

Yes, your servers as hardcoded to 10 mbps and 100 mbps with full duplex. Please check the hosts ports as well. By that I mean try setting both the switch ports to Speed 100/duplex full. Both the sides (switch ports and NIC cards on the pc )should be hardcoded. This could be the Auto-negotiation issue between the switch ports and the NIC cards.

Check for the errors on the user ports as well and if possible try upgrading the drivers for the NIC. If you find no errors on th switch ports and if you feel the NIC drivers are OK then try changing the cables also between the switch ports and the user.

Show log command will not list you the interface errors. You have use the same command that you have used to chek the port 18 and 19 and check the iput errors part.

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

HTH,

-amit singh