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Large number of Packet Drop and Throttles

 
 
Raymond Chow
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Posts: n/a
 
      10-27-2003
Hi all,

i have one C2948G switch connect to C4500 fastethernet interface with
ip address

when I issue the command "Show interface" in 4500, I can see there has
lot of packet drop and also collision.

FastEthernet0 is up, line protocol is up
Hardware is DEC21140, address is xxxxxxxxxxxxxxxxxxxxxxxxxxxx)
Internet address is 1.x.x.x/16
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set, keepalive set (10 sec)
Half-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 never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 16816 drops
5 minute input rate 271000 bits/sec, 39 packets/sec
5 minute output rate 56000 bits/sec, 23 packets/sec
357034616 packets input, 2724807594 bytes, 0 no buffer
Received 116554578 broadcasts, 0 runts, 46 giants, 5001 throttles
161 input errors, 161 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 watchdog, 0 multicast
89 input packets with dribble condition detected
267810141 packets output, 1023941407 bytes, 0 underruns
579981 output errors, 418871 collisions, 2 interface resets
0 babbles, 59 late collision, 0 deferred
189 lost carrier, 189 no carrier
0 output buffer failures, 0 output buffers swapped out


then when I issue "show port" in 2948G, I can see there has lot of fcs
error and collision happened in my port 48 which is connect to C4500
interface

Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts
Giants
----- ---------- ---------- ---------- ---------- --------- ---------
---------
2/48 424974 121856 0 0 0 4166
0

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize
----- ---------- ---------- ---------- ---------- ---------
2/48 - 4166 0 8332 0

Port Name Status Vlan Level Duplex Speed
Type
----- ------------------ ---------- ---------- ------ ------ -----
------------
2/48 connected 1 normal a-half a-100
10/100BaseTX



What I can see is that switch to NIC should able to run full duplex
however the link between C4500 and C2948 is running at 100 half
duplex.

can anyone tell me why I getting so many collision, throttles and
packet drop

Thanks Very much

Best Regards
Raymond Chow
 
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Dalgaard
Guest
Posts: n/a
 
      10-27-2003

"Raymond Chow" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) om...
> Hi all,
>
> i have one C2948G switch connect to C4500 fastethernet interface with
> ip address
>
> when I issue the command "Show interface" in 4500, I can see there has
> lot of packet drop and also collision.
>
> FastEthernet0 is up, line protocol is up
> Hardware is DEC21140, address is xxxxxxxxxxxxxxxxxxxxxxxxxxxx)
> Internet address is 1.x.x.x/16
> MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
> reliability 255/255, txload 1/255, rxload 1/255
> Encapsulation ARPA, loopback not set, keepalive set (10 sec)
> Half-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 never
> Queueing strategy: fifo
> Output queue 0/40, 0 drops; input queue 0/75, 16816 drops
> 5 minute input rate 271000 bits/sec, 39 packets/sec
> 5 minute output rate 56000 bits/sec, 23 packets/sec
> 357034616 packets input, 2724807594 bytes, 0 no buffer
> Received 116554578 broadcasts, 0 runts, 46 giants, 5001 throttles
> 161 input errors, 161 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
> 0 watchdog, 0 multicast
> 89 input packets with dribble condition detected
> 267810141 packets output, 1023941407 bytes, 0 underruns
> 579981 output errors, 418871 collisions, 2 interface resets
> 0 babbles, 59 late collision, 0 deferred
> 189 lost carrier, 189 no carrier
> 0 output buffer failures, 0 output buffers swapped out
>
>
> then when I issue "show port" in 2948G, I can see there has lot of fcs
> error and collision happened in my port 48 which is connect to C4500
> interface
>
> Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts
> Giants
> ----- ---------- ---------- ---------- ---------- --------- ---------
> ---------
> 2/48 424974 121856 0 0 0 4166
> 0
>
> Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize
> ----- ---------- ---------- ---------- ---------- ---------
> 2/48 - 4166 0 8332 0
>
> Port Name Status Vlan Level Duplex Speed
> Type
> ----- ------------------ ---------- ---------- ------ ------ -----
> ------------
> 2/48 connected 1 normal a-half a-100
> 10/100BaseTX
>
>
>
> What I can see is that switch to NIC should able to run full duplex
> however the link between C4500 and C2948 is running at 100 half
> duplex.
>
> can anyone tell me why I getting so many collision, throttles and
> packet drop
>
> Thanks Very much
>
> Best Regards
> Raymond Chow


Because you are running Half-duplex, try to hardcode the switch and router
to 100Mbit Full duplex!


 
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vsakel
Guest
Posts: n/a
 
      10-27-2003
Hi
a. Try to ''move'' the port in a full dublex mode manually in order to get
rid off all those collisions
conf t
int faxx
duplex full

b check cables, change port, etc

vsakel



"Raymond Chow" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) om...
>
> Hi all,
>
> i have one C2948G switch connect to C4500 fastethernet interface with
> ip address
>
> when I issue the command "Show interface" in 4500, I can see there has
> lot of packet drop and also collision.
>
> FastEthernet0 is up, line protocol is up
> Hardware is DEC21140, address is xxxxxxxxxxxxxxxxxxxxxxxxxxxx)
> Internet address is 1.x.x.x/16
> MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
> reliability 255/255, txload 1/255, rxload 1/255
> Encapsulation ARPA, loopback not set, keepalive set (10 sec)
> Half-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 never
> Queueing strategy: fifo
> Output queue 0/40, 0 drops; input queue 0/75, 16816 drops
> 5 minute input rate 271000 bits/sec, 39 packets/sec
> 5 minute output rate 56000 bits/sec, 23 packets/sec
> 357034616 packets input, 2724807594 bytes, 0 no buffer
> Received 116554578 broadcasts, 0 runts, 46 giants, 5001 throttles
> 161 input errors, 161 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
> 0 watchdog, 0 multicast
> 89 input packets with dribble condition detected
> 267810141 packets output, 1023941407 bytes, 0 underruns
> 579981 output errors, 418871 collisions, 2 interface resets
> 0 babbles, 59 late collision, 0 deferred
> 189 lost carrier, 189 no carrier
> 0 output buffer failures, 0 output buffers swapped out
>
>
> then when I issue "show port" in 2948G, I can see there has lot of fcs
> error and collision happened in my port 48 which is connect to C4500
> interface
>
> Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts
> Giants
> ----- ---------- ---------- ---------- ---------- --------- ---------
> ---------
> 2/48 424974 121856 0 0 0 4166
> 0
>
> Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize
> ----- ---------- ---------- ---------- ---------- ---------
> 2/48 - 4166 0 8332 0
>
> Port Name Status Vlan Level Duplex Speed
> Type
> ----- ------------------ ---------- ---------- ------ ------ -----
> ------------
> 2/48 connected 1 normal a-half a-100
> 10/100BaseTX
>
>
>
> What I can see is that switch to NIC should able to run full duplex
> however the link between C4500 and C2948 is running at 100 half
> duplex.
>
> can anyone tell me why I getting so many collision, throttles and
> packet drop
>
> Thanks Very much
>
> Best Regards
> Raymond Chow



 
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