Hello All,
We’re noticing a large number of input errors on multiple GigE interfaces on
various C720X NPE-G1 routers. These input errors match exactly with the number
of overruns on those interfaces.
There are a couple strange things that we’ve noticed:
1. this problem happens on more than 1 router (similar configuration on
all routers)
2. all routers affected began exhibiting these errors roughly around the
same time (same early morning)
3. All routers are G1 and ran the same IOS code
4. One of the routers was rebooted and upgraded to a different code
however the problem still persists
5. we suspect it directly affects the functionality of the router as we
see random lockups of the units
6. All routers are connected to redundant switches and cabling/switches
have been ruled out.
Below is a sample output of the show interface on one of the routers:
GigabitEthernet0/1 is up, line protocol is up
Hardware is BCM1250 Internal MAC, address is 00b0.c2ee.b81b (bia
00b0.c2ee.b81b)
Description: XXXXXXXX
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 2/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is RJ45
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 never
Input queue: 1/75/499528/97 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 8539000 bits/sec, 10996 packets/sec
5 minute output rate 1905000 bits/sec, 807 packets/sec
139728650 packets input, 10628478461 bytes, 92 no buffer
Received 487174 broadcasts, 0 runts, 0 giants, 0 throttles
171399 input errors, 0 CRC, 0 frame, 171399 overrun, 0 ignored
0 watchdog, 1904930 multicast, 0 pause input
0 input packets with dribble condition detected
8125773 packets output, 2521690484 bytes, 0 underruns
2 output errors, 0 collisions, 1 interface resets
3842 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
2 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
Does anyone have any idea what might be going on?
I initially suspected an IOS bug (since all devices were affected) however
after the upgrade the problem still persists.
Any help is appreciated.
Adrian
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