Re: N3K-C3172PQ-XL output discard

junliliao · ‎12-29-2020

亲爱的大家，

我在遇到有关N3K-C3172PQ-XL的问题，某些接口具有“输出替换”。如下所示：

首次收藏：

N3K-32＃显示接口计数器错误

-------------------------------------------------- ------------------------------

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards

-------------------------------------------------- ------------------------------

mgmt0 0 0 ----

Eth1 / 1 0 0 0 0 0 35077298

Eth1 / 2 0 0 0 0 0 38241991

eth1 / 3 0 0 0 0 0 0

Eth1 / 4 0 0 0 0 0 44004719

eth1 / 5 0 0 0 0 0 66891397

Eth1 / 6 0 0 0 0 0 0

Eth1 / 7 0 0 0 0 0 0

Eth1 / 8 0 0 0 0 0 0

Eth1 / 9 0 0 0 0 0 0

eth1 / 10 0 0 0 0 0 65665953

Eth1 / 11 0 0 0 0 0 0

eth1 / 12 0 0 0 0 0 8279009

eth1 / 13 0 0 0 0 0 280

eth1 / 14 0 0 0 0 0 0

Eth1 / 15 0 0 0 0 0 494

eth1 / 16 0 0 0 0 0 0

Eth1 / 17 0 0 0 0 0 34667434

Eth1 / 18 0 0 0 0 0 24614309

Eth1 / 19 0 0 0 0 0 55017187

Eth1 / 20 0 0 0 0 0 52608841

Eth1 / 21 0 0 0 0 0 46332840

Eth1 / 22 0 0 0 0 0 0

Eth1 / 23 0 0 0 0 0 16012031

Eth1 / 24 0 0 0 0 0 41661277

Eth1 / 25 0 0 0 0 0 80392433

Eth1 / 26 0 0 0 0 0 71782716

Eth1 / 27 0 0 0 0 0 48464116

Eth1 / 28 0 0 0 0 0 43912404

Eth1 / 29 0 0 0 0 0 10551673

Eth1 / 30 0 0 0 0 0 0

Eth1/31 0 0 0 0 0 0

Eth1/32 0 0 0 0 0 0

Eth1/33 0 0 0 0 0 46308275

Eth1/34 0 0 0 0 0 64992477

Eth1/35 0 0 0 0 0 43896436

Eth1/36 0 0 0 0 0 29039544

Eth1/37 0 0 0 0 0 38097783

Eth1/38 0 0 0 0 0 31885598

Eth1/39 0 0 0 0 0 0

Eth1/40 0 0 0 0 0 55723757

Eth1/41 0 0 0 0 0 25205639

Eth1/42 0 0 0 0 0 53135474

Eth1/43 0 0 0 0 0 20105675

Eth1/44 0 0 0 0 0 54179824

Eth1/45 0 0 0 0 0 0

Eth1/46 0 0 0 0 0 0

Eth1/47 0 0 0 0 0 0

Eth1/48 0 0 0 0 0 0

Eth1/49 0 0 0 0 0 0

Eth1/50 0 0 0 0 0 0

Eth1/51 0 0 0 0 0 0

Eth1/52 0 0 0 0 0 0

Eth1/53 0 0 0 0 0 13964

Eth1/54 0 0 0 0 0 494

Po1 0 0 0 0 0 35077298

Po2 0 0 0 0 0 38241991

Po3 0 0 0 0 0 0

Po4 0 0 0 0 0 44004719

Po5 0 0 0 0 0 66891397

Po6 0 0 0 0 0 0

Po7 0 0 0 0 0 0

Po8 0 0 0 0 0 0

Po9 0 0 0 0 0 0

Po10 0 0 0 0 0 65665953

Po11 0 0 0 0 0 0

Po12 0 0 0 0 0 8279009

Po13 0 0 0 0 0 280

Po14 0 0 0 0 0 0

Po15 0 0 0 0 0 494

Po16 0 0 0 0 0 0

Po17 0 0 0 0 0 34667434

Po18 0 0 0 0 0 24614309

Po19 0 0 0 0 0 55017187

Po20 0 0 0 0 0 52608841

Po21 0 0 0 0 0 46332840

Po22 0 0 0 0 0 0

Po23 0 0 0 0 0 16012031

Po24 0 0 0 0 0 41661277

Po25 0 0 0 0 0 80392433

Po26 0 0 0 0 0 71782716

Po27 0 0 0 0 0 48464116

Po28 0 0 0 0 0 43912404

Po29 0 0 0 0 0 10551673

Po30 0 0 0 0 0 0

Po31 0 0 0 0 0 0

Po32 0 0 0 0 0 0

Po33 0 0 0 0 0 46308275

Po34 0 0 0 0 0 64992477

Po35 0 0 0 0 0 43896436

Po36 0 0 0 0 0 29039544

Po37 0 0 0 0 0 38097783

Po38 0 0 0 0 0 31885598

Po39 0 0 0 0 0 0

Po40 0 0 0 0 0 55723757

Po41 0 0 0 0 0 25205639

Po42 0 0 0 0 0 53135474

Po43 0 0 0 0 0 20105675

Po44 0 0 0 0 0 54179824

Po45 0 0 0 0 0 0

Po46 0 0 0 0 0 0

Po47 0 0 0 0 0 0

Po48 0 0 0 0 0 0

Po99 0 0 0 0 0 0

Second collection:

N3K-32# show interface counters error

--------------------------------------------------------------------------------

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards

--------------------------------------------------------------------------------

mgmt0 0 0 -- -- -- --

Eth1/1 0 0 0 0 0 35588329

Eth1/2 0 0 0 0 0 38569958

Eth1/3 0 0 0 0 0 0

Eth1/4 0 0 0 0 0 44504553

Eth1/5 0 0 0 0 0 67649367

Eth1/6 0 0 0 0 0 0

Eth1/7 0 0 0 0 0 0

Eth1/8 0 0 0 0 0 0

Eth1/9 0 0 0 0 0 0

Eth1/10 0 0 0 0 0 66036329

Eth1/11 0 0 0 0 0 0

Eth1/12 0 0 0 0 0 8281723

Eth1/13 0 0 0 0 0 280

Eth1/14 0 0 0 0 0 0

Eth1/15 0 0 0 0 0 494

Eth1/16 0 0 0 0 0 0

Eth1/17 0 0 0 0 0 35088962

Eth1/18 0 0 0 0 0 24614443

Eth1/19 0 0 0 0 0 55369558

Eth1/20 0 0 0 0 0 52920239

Eth1/21 0 0 0 0 0 46696303

Eth1/22 0 0 0 0 0 0

Eth1/23 0 0 0 0 0 16127043

Eth1/24 0 0 0 0 0 41907150

Eth1/25 0 0 0 0 0 80839232

Eth1/26 0 0 0 0 0 72181213

Eth1/27 0 0 0 0 0 48475432

Eth1/28 0 0 0 0 0 44270644

Eth1/29 0 0 0 0 0 10639974

Eth1/30 0 0 0 0 0 0

Eth1/31 0 0 0 0 0 0

Eth1/32 0 0 0 0 0 0

Eth1/33 0 0 0 0 0 46730219

Eth1/34 0 0 0 0 0 65535923

Eth1/35 0 0 0 0 0 44440774

Eth1/36 0 0 0 0 0 29043442

Eth1/37 0 0 0 0 0 38109891

Eth1/38 0 0 0 0 0 32207949

Eth1/39 0 0 0 0 0 0

Eth1/40 0 0 0 0 0 55983909

Eth1/41 0 0 0 0 0 25343057

Eth1/42 0 0 0 0 0 53427729

Eth1/43 0 0 0 0 0 20112625

Eth1/44 0 0 0 0 0 54184483

Eth1/45 0 0 0 0 0 0

Eth1/46 0 0 0 0 0 0

Eth1/47 0 0 0 0 0 0

Eth1/48 0 0 0 0 0 0

Eth1/49 0 0 0 0 0 0

Eth1/50 0 0 0 0 0 0

Eth1/51 0 0 0 0 0 0

Eth1/52 0 0 0 0 0 0

Eth1/53 0 0 0 0 0 13964

Eth1/54 0 0 0 0 0 494

Po1 0 0 0 0 0 35588329

Po2 0 0 0 0 0 38569958

Po3 0 0 0 0 0 0

Po4 0 0 0 0 0 44504553

Po5 0 0 0 0 0 67649367

Po6 0 0 0 0 0 0

Po7 0 0 0 0 0 0

Po8 0 0 0 0 0 0

Po9 0 0 0 0 0 0

Po10 0 0 0 0 0 66036329

Po11 0 0 0 0 0 0

Po12 0 0 0 0 0 8281723

Po13 0 0 0 0 0 280

Po14 0 0 0 0 0 0

Po15 0 0 0 0 0 494

Po16 0 0 0 0 0 0

Po17 0 0 0 0 0 35088962

Po18 0 0 0 0 0 24614443

Po19 0 0 0 0 0 55369558

Po20 0 0 0 0 0 52920239

Po21 0 0 0 0 0 46696303

Po22 0 0 0 0 0 0

Po23 0 0 0 0 0 16127043

Po24 0 0 0 0 0 41907150

Po25 0 0 0 0 0 80839232

Po26 0 0 0 0 0 72181213

Po27 0 0 0 0 0 48475432

Po28 0 0 0 0 0 44270644

Po29 0 0 0 0 0 10639974

Po30 0 0 0 0 0 0

Po31 0 0 0 0 0 0

Po32 0 0 0 0 0 0

Po33 0 0 0 0 0 46730219

Po34 0 0 0 0 0 65540179

Po35 0 0 0 0 0 44443366

Po36 0 0 0 0 0 29043442

Po37 0 0 0 0 0 38109891

Po38 0 0 0 0 0 32207949

Po39 0 0 0 0 0 0

Po40 0 0 0 0 0 55984404

Po41 0 0 0 0 0 25343240

Po42 0 0 0 0 0 53429390

Po43 0 0 0 0 0 20112625

Po44 0 0 0 0 0 54184483

Po45 0 0 0 0 0 0

Po46 0 0 0 0 0 0

Po47 0 0 0 0 0 0

Po48 0 0 0 0 0 0

Po99 0 0 0 0 0 0

N3K-32# show queuing interface e1/43

slot 1
=======

HW MTU of Ethernet1/43 : 1500 bytes

Egress Queuing for Ethernet1/43 [System]
------------------------------------------------------------------------------
QoS-Group# Bandwidth% PrioLevel Shape QLimit
Min Max Units
------------------------------------------------------------------------------
0 100 - - - - 7(D)
+-------------------------------------------------------------------+
| QOS GROUP 0 |
+-------------------------------------------------------------------+
| | Unicast | OOBFC Unicast | Multicast |
+-------------------------------------------------------------------+
| Tx Pkts | 62418716945| 0| 1733201|
| Tx Byts | 88102510999433| 0| 355186040|
| Dropped Pkts | 375657461| 0| 0|
| Dropped Byts | 560453280035| 0| 0|
| Q Depth Byts | 0| 0| 0|
+-------------------------------------------------------------------+
| CONTROL QOS GROUP |
+-------------------------------------------------------------------+
| | Unicast | OOBFC Unicast | Multicast |
+-------------------------------------------------------------------+
| Tx Pkts | 3211261| 0| 200164|
| Tx Byts | 258428218| 0| 18587472|
| Dropped Pkts | 4| 0| 0|
| Dropped Byts | 900| 0| 0|
| Q Depth Byts | 0| 0| 0|
+-------------------------------------------------------------------+

Port Egress Statistics
--------------------------------------------------------
WRED Drop Pkts 0
WRED Non ECN Drop Pkts 0

Ingress Queuing for Ethernet1/43
------------------------------------------------------------------
QoS-Group# Pause QLimit
Buff Size Pause Th Resume Th
------------------------------------------------------------------
7 - - - 11510512(S)
6 - - - 11510512(S)
5 - - - 11510512(S)
4 - - - 11510512(S)
3 - - - 11510512(S)
2 - - - 11510512(S)
1 - - - 11510512(S)
0 - - - 11510512(S)

Port Ingress Statistics
--------------------------------------------------------
Ingress MMU Drop Pkts 0
Ingress MMU Drop Bytes 0

PFC Statistics
----------------------------------------------------------------------------
TxPPP: 0, RxPPP: 0
----------------------------------------------------------------------------

...skipping one line
0 - 7 Inactive 0 Inactive 0
1 - 7 Inactive 0 Inactive 0
2 - 7 Inactive 0 Inactive 0
3 - 7 Inactive 0 Inactive 0
4 - 7 Inactive 0 Inactive 0
5 - 7 Inactive 0 Inactive 0
6 - 7 Inactive 0 Inactive 0
7 - 7 Inactive 0 Inactive 0
----------------------------------------------------------------------------

N3K-32# show queuing interface e1/41

slot 1
=======

HW MTU of Ethernet1/41 : 1500 bytes

Egress Queuing for Ethernet1/41 [System]
------------------------------------------------------------------------------
QoS-Group# Bandwidth% PrioLevel Shape QLimit
Min Max Units
------------------------------------------------------------------------------
0 100 - - - - 7(D)
+-------------------------------------------------------------------+
| QOS GROUP 0 |
+-------------------------------------------------------------------+
| | Unicast | OOBFC Unicast | Multicast |
+-------------------------------------------------------------------+
| Tx Pkts | 121415795184| 0| 4861279|
| Tx Byts | 163400233882814| 0| 3429816454|
| Dropped Pkts | 467050874| 0| 4031|
| Dropped Byts | 692439890870| 0| 6001727|
| Q Depth Byts | 0| 0| 0|
+-------------------------------------------------------------------+
| CONTROL QOS GROUP |
+-------------------------------------------------------------------+
| | Unicast | OOBFC Unicast | Multicast |
+-------------------------------------------------------------------+
| Tx Pkts | 5196435| 0| 257490|
| Tx Byts | 418228704| 0| 23215876|
| Dropped Pkts | 40| 0| 0|
| Dropped Byts | 6934| 0| 0|
| Q Depth Byts | 0| 0| 0|
+-------------------------------------------------------------------+

Port Egress Statistics
--------------------------------------------------------
WRED Drop Pkts 0
WRED Non ECN Drop Pkts 0

入口队列为端口Ethernet / 41
-------------------------------------------- ----------------------
QoS组＃暂停Q限制
Buff大小暂停Th恢复Th
---------------- --------------------------------------------------
7---11510512（S）
6---11510512（S）
5---11510512（S）
4---11510512（S）
3---11510512（S）
2---11510512（S）
1- --11510512（S）
0---11510512（S）

端口入口统计
----------------------------------------------- ---------
入口MMU
丢弃字节数0入口MMU丢弃字节数0

PFC统计信息
----------------------------------------------- -----------------------------
TxPPP：0，RxPPP：0
-------------- -------------------------------------------------- ------------

...跳过一行
0-7无效0无效0
1-7无效0无效0
2-7无效0无效0
3-7无效0无效0
4-7无效0无效0
5-7无效0无效0
6- 7无效0无效0
7-7无效0无效0
-------------------------------------- --------------------------------------

是什么原因？它不断增加，我该如何解决？

业务部门不断报告服务器已超时。

julian.bendix · ‎01-06-2021

Hey!

Do you experience performance issues and (or because of) packet loss in your network?

Maybe we could check with wireshark captures in your network.

The output drops seem quite high... I would almost guess this could be a cosmetic bug.
We could verify that by checking if we see packet loss.

Other than that.. output drops would normally indicate that traffic rates were to high and packets had to be dropped due to buffer overflow.. but I doubt that is the case.

Do you have the oppertunity to open a TAC Case with Cisco?

Best regards
Julian