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Total output drops

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arctic at alkar

Oct 29, 2009, 2:27 AM

Post #1 of 3 (2839 views)
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Total output drops

Hi, all!

I have a problem with total output drops on the etherchannel.

I have the etherchannel between
cisco WS-C3560E-24TD (System image file is
"flash:/c3560e-universalk9-mz.122-46.SE.bin") and
CISCO7606 (SUP-32) (c7600s3223_rp Software
(c7600s3223_rp-ADVIPSERVICESK9-M), Version 12.2(33)SRB4, RELEASE
SOFTWARE (fc3))

On 3560-E:
interface Port-channel1
description CORE
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2,3,4
switchport mode trunk
switchport nonegotiate
load-interval 30
storm-control broadcast level pps 500k
storm-control multicast level bps 1m
spanning-tree portfast trunk
spanning-tree bpdufilter enable

One of the link:
interface GigabitEthernet0/7
description CORE-1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2,3,4
switchport mode trunk
switchport nonegotiate
load-interval 30
speed 1000
duplex full
storm-control broadcast level pps 500k
storm-control multicast level bps 1m
no cdp enable
channel-protocol lacp
channel-group 1 mode active
spanning-tree portfast trunk
spanning-tree bpdufilter enable

On both devices:
port-channel load-balance src-dst-ip

QoS disabled

output of the show interfaces command:
sh int po1
Port-channel1 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 001e.bed9.d308 (bia
001e.bed9.d308)
Description: CORE
MTU 9000 bytes, BW 8000000 Kbit, DLY 10 usec,
reliability 255/255, txload 99/255, rxload 98/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, link type is auto, media type is unknown
input flow-control is off, output flow-control is unsupported
Members in this channel: Gi0/7 Gi0/8 Gi0/9 Gi0/10 Gi0/11 Gi0/12 Gi0/13
Gi0/14
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:02:19, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops:
46509
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

This counter constantly increasing :(

Can anyone help me here?

--
***AOS224-RIPE*** mailto:arctic [at] alkar
Phone +38(056)3728047

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peter at rathlev

Oct 29, 2009, 4:28 AM

Post #2 of 3 (2807 views)
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Re: Total output drops [In reply to]

On Thu, 2009-10-29 at 11:27 +0200, Andrey O.Sokolov wrote:
> I have a problem with total output drops on the etherchannel.
>
> I have the etherchannel between
> cisco WS-C3560E-24TD (System image file is "flash:/c3560e-universalk9-mz.122-46.SE.bin") and
> CISCO7606 (SUP-32) (c7600s3223_rp Software (c7600s3223_rp-ADVIPSERVICESK9-M), Version 12.2(33)SRB4, RELEASE SOFTWARE (fc3))
[...]
> Port-channel1 is up, line protocol is up (connected)
[...]
> Members in this channel: Gi0/7 Gi0/8 Gi0/9 Gi0/10 Gi0/11 Gi0/12 Gi0/13 Gi0/14
> ARP type: ARPA, ARP Timeout 04:00:00
> Last input never, output 00:02:19, output hang never
> Last clearing of "show interface" counters never
> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 46509
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> This counter constantly increasing :(

I assume the dropping is only on the 3560E. What does "show interface
Po1 counters errors" say? Are they all OutDiscards?

If they are, look at the QoS drop stats (even though QoS is disabled):
"show platform port-asic stats drop Gi0/7" and so on.

It might be the shallow buffers discussed many times on this list.

--
Peter

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arctic at alkar

Oct 29, 2009, 8:04 AM

Post #3 of 3 (2816 views)
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Re: Total output drops [In reply to]

В чт, 29/10/2009 в 12:28 +0100, Peter Rathlev пишет:
> On Thu, 2009-10-29 at 11:27 +0200, Andrey O.Sokolov wrote:
> > I have a problem with total output drops on the etherchannel.
> >
> > I have the etherchannel between
> > cisco WS-C3560E-24TD (System image file is "flash:/c3560e-universalk9-mz.122-46.SE.bin") and
> > CISCO7606 (SUP-32) (c7600s3223_rp Software (c7600s3223_rp-ADVIPSERVICESK9-M), Version 12.2(33)SRB4, RELEASE SOFTWARE (fc3))
> [...]
> > Port-channel1 is up, line protocol is up (connected)
> [...]
> > Members in this channel: Gi0/7 Gi0/8 Gi0/9 Gi0/10 Gi0/11 Gi0/12 Gi0/13 Gi0/14
> > ARP type: ARPA, ARP Timeout 04:00:00
> > Last input never, output 00:02:19, output hang never
> > Last clearing of "show interface" counters never
> > Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 46509
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> >
> > This counter constantly increasing :(
>
> I assume the dropping is only on the 3560E.

You are right, Peter.

> What does "show interface
> Po1 counters errors" say?

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize
OutDiscards
Po1 0 0 0 0 0
47709

> Are they all OutDiscards?

Yes.

> If they are, look at the QoS drop stats (even though QoS is disabled):
> "show platform port-asic stats drop Gi0/7" and so on.

Only:
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 873

> It might be the shallow buffers discussed many times on this list.

I am very grateful, Peter ;)

--
***AOS224-RIPE*** mailto:arctic [at] alkar
Phone +38(056)3728047

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