Cisco 2911 Router overrun count Increasing issue

[SEOK KANG]

Dear Forum users.

Hi there. I have a some trouble about interface overrun increasing issue.

Here is our router interface informations

GigabitEthernet0/0 is up, line protocol is up
Hardware is CN Gigabit Ethernet, address is 
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 4/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full Duplex, 1Gbps, media type is RJ45
output flow-control is unsupported, input flow-control is unsupported
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 2d08h
Input queue: 2/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 1080000 bits/sec, 1094 packets/sec
5 minute output rate 16182000 bits/sec, 1790 packets/sec
198538830 packets input, 2885754939 bytes, 0 no buffer
Received 450868 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
1899 input errors, 0 CRC, 0 frame, 1899 overrun, 0 ignored
0 watchdog, 450853 multicast, 0 pause input
305609530 packets output, 2496748205 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
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

==================================================

GigabitEthernet0/2 is up, line protocol is up
Hardware is CN Gigabit Ethernet, address is 
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 2/255, rxload 33/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full Duplex, 100Mbps, media type is RJ45
output flow-control is unsupported, input flow-control is unsupported
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 2d08h
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 2738
Queueing strategy: fifo
Output queue: 0/40 (size/max)
30 second input rate 13114000 bits/sec, 1493 packets/sec
30 second output rate 1019000 bits/sec, 1110 packets/sec
305474187 packets input, 2602722331 bytes, 2738 no buffer
Received 11346 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
797 input errors, 0 CRC, 0 frame, 797 overrun, 0 ignored
0 watchdog, 3369 multicast, 0 pause input
243127544 packets output, 1937425021 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
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

==================================================

1. G0/0 connecting internet router between internal switch (C3850 Series)

2. G0/0 connecting internet router between ISP Router (operating BGP Protocol)

Questions

Q1. what is the input or output traffic-control?

Q2. what is the diffrence point unsupported, disable, XON etc?

Q3. How can i take a actions troubleshoot about it?

thanks.

[Philip D'Ath]

Overruns usually happen when data is being received faster than the router can process that data.  This could be caused by features being used, such as NAT, Firewall, etc.

What features are you using on your router, or would you like to post the config?

Is it causing any actual errors, or have you just observed it?

What software version are you using on your 2911?

How much CPU is being consumed on the router?

[SEOK KANG]

Thanks Philip

Here is answer your questions.

1-1. we use BGP routing connecting between Service Provider Router.

1-2. unfortunately, i can't post our router configuration 
2. router IOS version is 15.2(4)M4 version.

3. generally, router CPU using under the 5 percent

PS. we use same router, that connecting another SP. running BGP feature, same IOS version.

        but it is not detect overrun count.

waiting your reply.

thanks 

[dukenuk96]

Hi

check this discussion https://supportforums.cisco.com/document/13796/overruns-counter-show-interfaces-command-output-increasing

Let's calculate a bit you have 198538830 packets input and 1899 are overrun, this is just 0,000956488% of total input packets. Are you still worried about this counter in your situation? :)

[SEOK KANG]

thanks for your reply.

Here is securities company. if you think it is small count, but we are very nervous.

[Philip D'Ath]

You have nothing to worry about.