PC dropping off the network

[JoyriderUK]

Senario:-

2 x PC's Windows 2000 plugged into
Cisco 2950 with Dual EtherChannel Gigabit uplinks into
Cisco Catalyst 6509

The first PC can access servers fine at all times.
Second PC drops off intermittantly, but can see SOME servers via the uplink not others.


Port settings are the same on the client switch! I'm thinking drivers.. but both PC's have the same revision of drivers.

Both ports are running clean without any errors. 0/40 has the working PC on it, 0/47 is the pony connection.

I'm thinking faulty port... any other suggestions?

!
interface Port-channel1
switchport mode trunk
no ip address
!
!
interface FastEthernet0/40
no ip address
carrier-delay 4
duplex full
speed 100
spanning-tree portfast
!
!
interface FastEthernet0/47
no ip address
carrier-delay 4
duplex full
speed 100
spanning-tree portfast
!
!
interface GigabitEthernet0/1
switchport mode trunk
no ip address
channel-group 1 mode desirable
!
interface GigabitEthernet0/2
switchport mode trunk
no ip address
channel-group 1 mode desirable
!




LDNSWT019#sho int fa0/40
FastEthernet0/40 is up, line protocol is up
Hardware is Fast Ethernet, address is 000b.fd1f.3ce8 (bia 000b.fd1f.3ce8)
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)
Carrier delay is 4 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 00:00:01, output hang never
Last clearing of "show interface" counters 04:26:28
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
44610 packets input, 6208975 bytes, 0 no buffer
Received 161 broadcasts, 0 runts, 0 giants, 0 throttles
4 input errors, 4 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
146012 packets output, 38528436 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




FastEthernet0/47 is up, line protocol is up
Hardware is Fast Ethernet, address is 000b.fd1f.3cef (bia 000b.fd1f.3cef)
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)
Carrier delay is 4 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 04:24:15
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
42878 packets input, 10473190 bytes, 0 no buffer
Received 101 broadcasts, 0 runts, 0 giants, 0 throttles
1 input errors, 1 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
135623 packets output, 33570642 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

 

[gaveeve]

Try switching the connection and see if the problem follows the pc or the port.

 

[vino42]

In see in fa0/40 CRC errors. Should be patch cables. Second verify negotiation on card and switch(+speed+duplex)

 

[RLEE5]

Have you ckecked for noise on that line? (AC, fax, phone)
I just use a fox/hound receiver to look for obvious noise.
I've had external noise cause more strange problems than I can mention.

R.Lee

 

[baddos]

Is the NIC on the computer hard set to match the switches settings?

-Bad Dos

 

[Twinmoon]

Does the second PC have problems connecting to only those servers? (faulty nic?)

 

[JoyriderUK]

The problem appears to be with EtherChannel on the GigaBit uplinks.. go down to one channel and all is well..

A job for the TAC I think..

 

[bierhunter]

From first looks, the CRC errors you show are very few, and could have happened during the install.

Here's what I would do.

1. Clear counters on both interfaces.
2. Do an extended ping of a few thousand pings at about 1000 bytes each packet to each host. This will help you get an idea of your basic network connectivity. You should get zero errors, since you own the network. If you get any dropped packets, then check your connections. Also look for FCS errors.
3. If you get zero errors, then your physical layer is probably ok. If you get FCS errors, then recheck your cabling. If you get runts, then check your PC.
4. You already have portfast enabled, so STP issues shouldn't be a problem. At this point, if your cabling is ok, I would suspect the client as a problem child.