11-14-2006 06:28 AM - edited 03-03-2019 05:25 AM
Hi -
we are observing 0.01% and 0.12% InputErrors on an Etherchannel between a 6500 and a 4500 consisting of 4 (resp. 3) GigaBit Links. We discovered that the Packets were simply droped due to "Rx-No-Pkt-Buff" - We have a PRTG Graph showing a rather low utilization of 3% or less (5 min average) over the whole day or week. Customer experiences disconnect session in his SAP and Mainframe Aplications ...
Anybody any Idea how these errors could come into existance? The counters were cleared a few days ago to confirm this observation ...
The EtherChannel Load-Balancing is src-dst-ip (the default) - an the errors are distributed 15 - 30 % among the 4 ports.
Nothing Suspicious in the Logs - a few OutDiscards on some Ports/Channels to a range of servers.
Regards
Robert
11-14-2006 06:47 AM
Hi Robert ,
Can you paste sh int gig output of both routers.
Thanks,
satish
11-14-2006 06:50 AM
Below the show int:
(only 2/1 and 2/2 2/3-4 almost the same)
--------------------------------------------
GigabitEthernet2/1 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet Port, address is 000f.f742.e9f0 (bia 000f.f742.e9f0)
Description: Trunk zu hbmens03
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000-TX
input flow-control is on, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:05, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 6324000 bits/sec, 1168 packets/sec
5 minute output rate 541000 bits/sec, 159 packets/sec
8686920824 packets input, 10581825403873 bytes, 0 no buffer
Received 125157985 broadcasts (111201279 multicast)
5 runts, 0 giants, 0 throttles
9321859 input errors, 1 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
2346102954 packets output, 1775034484330 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 output buffer failures, 0 output buffers swapped out
GigabitEthernet2/2 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet Port, address is 000f.f742.e9f1 (bia 000f.f742.e9f1)
Description: Trunk
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000-TX
input flow-control is on, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:05, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 1620000 bits/sec, 403 packets/sec
5 minute output rate 3448000 bits/sec, 821 packets/sec
12372257480 packets input, 17700592747377 bytes, 0 no buffer
Received 65152265 broadcasts (35997526 multicast)
1 runts, 0 giants, 0 throttles
14274963 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
3467908099 packets output, 1722413143410 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 output buffer failures, 0 output buffers swapped out
11-14-2006 06:54 AM
switch# sh int po1 count deta
Port InBytes InUcastPkts InMcastPkts InBcastPkts
Po1 11299925717041 8147189079 39181675 11400608
Port OutBytes OutUcastPkts OutMcastPkts OutBcastPkts
Po1 1420324404663 3283253668 1112846 440881
Port InPkts 64 OutPkts 64 InPkts 65-127 OutPkts 65-127
Po1 208434 43628 487833822 2308774325
Port InPkts 128-255 OutPkts 128-255 InPkts 256-511 OutPkts 256-511
Po1 112313899 75128140 164251318 19567566
Port InPkts 512-1023 OutPkts 512-1023
Po1 155207086 106542771
Port InPkts 1024-1522 OutPkts 1024-1522 InPkts 1523-1600 OutPkts 1523-1600
Po1 7277956803 774750965 0 0
Port Tx-Bytes-Queue-1 Tx-Bytes-Queue-2 Tx-Bytes-Queue-3 Tx-Bytes-Queue-4
Po1 1420309318663 0 98390 126238732
Port Tx-Drops-Queue-1 Tx-Drops-Queue-2 Tx-Drops-Queue-3 Tx-Drops-Queue-4
Po1 0 0 0 0
Port Dbl-Drops-Queue-1 Dbl-Drops-Queue-2 Dbl-Drops-Queue-3 Dbl-Drops-Queue-4
Po1 0 0 0 0
Port Rx-No-Pkt-Buff RxPauseFrames TxPauseFrames PauseFramesDrop
Po1 10715805 0 0 0
Port UnsupOpcodePause
Po1 0
11-14-2006 07:14 AM
Hi ,
Did you check the port speeds on both ends.
Enable udld on 4500 and check whether it is enabled on 6500.
Thanks,
satish
11-14-2006 07:21 AM
Dont think this is a speed error. All Ports are on 1000 full (auto). No udld -> RJ45/Cat5 ...
11-14-2006 07:23 AM
11-14-2006 08:10 AM
If you are seeing this across all 4 I would cast an eye on the patch cords if they are directly connected , should be cat 6 at a minimum.
11-15-2006 12:19 AM
patch cords? The error is def. "Rx-No-Pkt-Buff" - patch cords might produce fcs, max aligment errors - I think we can exclude the patchcords ...
Thanks anyway
11-29-2006 12:24 AM
I do have the same problem. Low utilization on the link but seeing increasing total output drops. Have digging for a long time but did not find anything yet.
11-29-2006 01:29 AM
- we settled for design and internal switch problems/issues: head-of-line blocking and the 1Gbx4 per module oversupcription on the 4000 modules ...
- the customer himself discovered a bug wich increased these error counters without actually dropping the frames. (sorry don't remember the Bud # and IOS release ..)
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