11-12-2007 03:22 PM - edited 03-05-2019 07:23 PM
R1#show int gig0/1
GigabitEthernet0/1 is up, line protocol is up
Hardware is i82543 (Livengood), address is 0008.e2f8.ac06 (bia 0008.e2f8.ac06)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, link type is autonegotiation, media type is SX
output flow-control is XON, input flow-control is XON
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 00:30:44
Input queue: 0/75/3024334/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 3095000 bits/sec, 1273 packets/sec
5 minute output rate 4091000 bits/sec, 949 packets/sec
3255495 packets input, 727349130 bytes, 0 no buffer
Received 115669 broadcasts, 0 runts, 0 giants, 2 throttles
3024215 input errors, 800 CRC, 16 frame, 0 overrun, 3023399 ignored <----------
0 watchdog, 764539 multicast, 0 pause input
0 input packets with dribble condition detected
2703073 packets output, 1235096281 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
A few second later,
R1#show int gig0/1
GigabitEthernet0/1 is up, line protocol is up
Hardware is i82543 (Livengood), address is 0008.e2f8.ac06 (bia 0008.e2f8.ac06)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, link type is autonegotiation, media type is SX
output flow-control is XON, input flow-control is XON
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 00:33:20
Input queue: 0/75/4022935/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 2875000 bits/sec, 1406 packets/sec
5 minute output rate 4134000 bits/sec, 1137 packets/sec
3512480 packets input, 779541769 bytes, 0 no buffer
Received 125967 broadcasts, 0 runts, 0 giants, 2 throttles
4022816 input errors, 1055 CRC, 21 frame, 0 overrun, 4021740 ignored <----------
0 watchdog, 997384 multicast, 0 pause input
0 input packets with dribble condition detected
2929340 packets output, 1321198621 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
From: http://www.cisco.com/univercd/cc/td/doc/cisintwk/itg_v1/tr1904.htm
ignored : Shows the number of received packets ignored by the interface because the interface hardware ran low on internal buffers. These buffers are different from the system buffers mentioned previously in the buffer description. Broadcast storms and bursts of noise can cause the ignored count to be increased.
However, when we show proc cpu, the value for 5 seconds is 98%/93%. The interrupt utilization is high at 93% and the process utilization is 98-93=5%. In this case, can we saftely say that there are too much traffic hitting the router's gig0/1 and thus cause high interrupt utilization. Is there anything else we can do?
11-16-2007 02:05 PM
Check which process is loading the CPU. Unusual activity related to a process results in an error message in the log. Therefore, the output of the show logging exec command should be checked first for any errors related to the process which consumes lots of CPU cycles
http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a00800a70f2.shtml
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