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Overruns on Etherchannel

Good evening all..

I have a 4506 populated with the following modules

Mod Ports Card Type                              Model              Serial No.

---+-----+--------------------------------------+------------------+-----------

1     6  Sup 6L-E 10GE (X2), 1000BaseX (SFP)    WS-X45-SUP6L-E     JAE151707EW

2    48  10/100/1000BaseT (RJ45)                WS-X4548-GB-RJ45   JAE1518069U

3    48  10/100BaseTX (RJ45)V, Cisco/IEEE       WS-X4248-RJ45V     JAB084703CR

I have 2 etherchannels on blade two G2/1 and G2/2 po1 and G2/3 and G2/4 po2 both interfaces are experiencing overruns  which are incrementing

(see below with last clearing 31 mins ago)  Traffic over the averages are not even close to full utilization.  There is an iSCSI SAN on this blade and VM hosts connect to it from the 2960G's and my server guy is complaining about latentcy to the SAN.  1000 1500byte pings to each 2960 show 1/1/10 at most with 100%.  Any ideas or input would be most helpful.  This configuration was working fine prior to a move..  The switches were stood up exactly the same as they were at the old site.

GigabitEthernet2/1 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet Port, address is e05f.b9d3.7e60 (bia e05f.b9d3.7e60)

  Description: ds1.dc g0/4 (etherchannel 1 of 2)

  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

     reliability 255/255, txload 2/255, 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 off, output flow-control is off

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:01, output never, output hang never

  Last clearing of "show interface" counters 00:31:08

  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 3708000 bits/sec, 446 packets/sec

  5 minute output rate 8905000 bits/sec, 1118 packets/sec

     725118 packets input, 726734324 bytes, 0 no buffer

     Received 2053 broadcasts (301 multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 773 overrun, 0 ignored

     0 input packets with dribble condition detected

     1638868 packets output, 1580161277 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 e05f.b9d3.7e61 (bia e05f.b9d3.7e61)

  Description: ds1.dc g0/11 (etherchannel 2 of 2)

  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 off, output flow-control is off

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:09, output never, output hang never

  Last clearing of "show interface" counters 00:31:08

  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 7070000 bits/sec, 834 packets/sec

  5 minute output rate 7206000 bits/sec, 846 packets/sec

     1259247 packets input, 1298701012 bytes, 0 no buffer

     Received 1954 broadcasts (227 multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 1516 overrun, 0 ignored

     0 input packets with dribble condition detected

     1263407 packets output, 1265128792 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

GigabitEthernet2/3 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet Port, address is e05f.b9d3.7e62 (bia e05f.b9d3.7e62)

  Description: ds2.dc g0/23 etherchannel (1 of 2)

  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

     reliability 255/255, txload 1/255, rxload 4/255

  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 off, output flow-control is off

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:01, output never, output hang never

  Last clearing of "show interface" counters 00:31:10

  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 16117000 bits/sec, 1760 packets/sec

  5 minute output rate 4644000 bits/sec, 774 packets/sec

     3748242 packets input, 4088020420 bytes, 0 no buffer

     Received 2941 broadcasts (599 multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 1748 overrun, 0 ignored

     0 input packets with dribble condition detected

     1830390 packets output, 1511582457 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

GigabitEthernet2/4 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet Port, address is e05f.b9d3.7e63 (bia e05f.b9d3.7e63)

  Description: ds2.dc g0/24 etherchannel (2 of 2)

  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 off, output flow-control is off

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:01, output never, output hang never

  Last clearing of "show interface" counters 00:31:12

  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 406000 bits/sec, 89 packets/sec

  5 minute output rate 2283000 bits/sec, 427 packets/sec

     147900 packets input, 76515924 bytes, 0 no buffer

     Received 4079 broadcasts (216 multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 4 overrun, 0 ignored

     0 input packets with dribble condition detected

     942410 packets output, 727107342 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

Number of channel-groups in use: 3

Number of aggregators:           3

Group  Port-channel  Protocol    Ports

------+-------------+-----------+-----------------------------------------------

1      Po1(SU)         PAgP      Gi2/1(P)    Gi2/2(P)   

2      Po2(SU)         PAgP      Gi2/3(P)    Gi2/4(P)   

3      Po3(SU)         PAgP      Gi2/5(P)    Gi2/6(P)   

cs1.dc#show int po1

Port-channel1 is up, line protocol is up (connected)

  Hardware is EtherChannel, address is e05f.b9d3.7e61 (bia e05f.b9d3.7e61)

  Description: ds1.dc po1

  MTU 1500 bytes, BW 2000000 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, media type is N/A

  input flow-control is off, output flow-control is unsupported

  Members in this channel: Gi2/1 Gi2/2

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 3d01h, output never, output hang never

  Last clearing of "show interface" counters 00:35:56

  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 9835000 bits/sec, 1148 packets/sec

  5 minute output rate 13713000 bits/sec, 1660 packets/sec

     2273559 packets input, 2337795729 bytes, 0 no buffer

     Received 4557 broadcasts (620 multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 2431 overrun, 0 ignored

     0 input packets with dribble condition detected

     3291991 packets output, 3237402619 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

cs1.dc#

cs1.dc#show int po2

Port-channel2 is up, line protocol is up (connected)

  Hardware is EtherChannel, address is e05f.b9d3.7e62 (bia e05f.b9d3.7e62)

  Description: ds2.dc po1

  MTU 1500 bytes, BW 2000000 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, media type is N/A

  input flow-control is off, output flow-control is unsupported

  Members in this channel: Gi2/3 Gi2/4

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 05:14:12, output never, output hang never

  Last clearing of "show interface" counters 00:36:06

  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 14675000 bits/sec, 1798 packets/sec

  5 minute output rate 10789000 bits/sec, 1456 packets/sec

     4442441 packets input, 4683901004 bytes, 0 no buffer

     Received 8089 broadcasts (945 multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 1871 overrun, 0 ignored

     0 input packets with dribble condition detected

     3264911 packets output, 2736624694 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

cs1.dc#

2 REPLIES
Purple

Re: Overruns on Etherchannel

  You might want to try separating the channels across more of the card instead of having them on consecutive ports and see what happens .   Leave the first where it is , 2nd maybe  in the port 20 range and third in the upper 30 range just to separate them .   Also look at the utilization on the 2960's at the time of complaint using show controllers utilization .

New Member

Re: Overruns on Etherchannel

Thanks so much for the quick response.

Well let me try that later this week. I did shut down the second port in an etherchannel and the overruns still incremented… Traffic is not where near full.. Is this normal?

From: "glen.grant" >

Reply-To: "cisco-support@sgaur.hosted.jivesoftware.com" >

To: Josh Sprang >

Subject: - Re: Overruns on Etherchannel

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Re: Overruns on Etherchannel

created by glen.grant<> in LAN, Switching and Routing - View the full discussion<>

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