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Too high drop rate indication

Hello,

I have a switch where if I run the command "show platform cpu packet statistics all" I see too high values for the "Input Acl" field and at that box there are no ACLs configured.

You can see that in the output below (look for the text in bold):

Switch#show platform cpu packet statistics all

Packets Dropped In Hardware By CPU Subport (txQueueNotAvail)

CPU Subport  TxQueue 0       TxQueue 1       TxQueue 2       TxQueue 3

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

           0               0               0               0       226280143

           1               0               0               0               0

           2               0            3493               0               0

           3               0               0               0               0

           4               0               0               0               0

           5               0               0               0               0

           6               0               0               0               0

           7               0               0               0               0

RkiosSysPacketMan:

Packet allocation failures: 0

Packet Buffer(Software Common) allocation failures: 0

Packet Buffer(Software ESMP) allocation failures: 0

Packet Buffer(Software EOBC) allocation failures: 0

Packet Buffer(Software SupToSup) allocation failures: 0

IOS Packet Buffer Wrapper allocation failures: 0

Packets Enqueued Overall

Total                5 sec avg 1 min avg 5 min avg 1 hour avg

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

                   0         0         0         0          0

Packets Not Enqueued Overall

Total                5 sec avg 1 min avg 5 min avg 1 hour avg

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

                   0         0         0         0          0

Packets Dropped In Processing Overall

Total                5 sec avg 1 min avg 5 min avg 1 hour avg

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

            30536158        27        19        20         20

Packets Not Enqueued by CPU event

Event             Total                5 sec avg 1 min avg 5 min avg 1 hour avg

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

Control Packet                       0         0         0         0          0

Input Acl                            0         0         0         0          0

RPF Fail                             0         0         0         0          0

Adjacency Same If                    0         0         0         0          0

L3 Forward                           0         0         0         0          0

NFL Copy To CPU                      0         0         0         0          0

Output Acl                           0         0         0         0          0

MTU Check Fail                       0         0         0         0          0

SA Miss                              0         0         0         0          0

L2 Forward                           0         0         0         0          0

SPAN                                 0         0         0         0          0

CPU Generated                        0         0         0         0          0

Unknown                              0         0         0         0          0

Packets Dropped In Processing by CPU event

Event             Total                5 sec avg 1 min avg 5 min avg 1 hour avg

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

Control Packet                       0         0         0         0          0

Input Acl                     30535609        27        19        20         20

RPF Fail                             0         0         0         0          0

Adjacency Same If                    0         0         0         0          0

L3 Forward                           0         0         0         0          0

NFL Copy To CPU                      0         0         0         0          0

Output Acl                           0         0         0         0          0

MTU Check Fail                       0         0         0         0          0

SA Miss                            548         0         0         0          0

L2 Forward                           0         0         0         0          0

SPAN                                 0         0         0         0          0

CPU Generated                        0         0         0         0          0

Unknown                              0         0         0         0          0

Packets Not Enqueued by Priority

Priority          Total                5 sec avg 1 min avg 5 min avg 1 hour avg

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

Unknown                              0         0         0         0          0

Normal                               0         0         0         0          0

Medium                               0         0         0         0          0

High                                 0         0         0         0          0

Crucial                              0         0         0         0          0

Super Crucial                        0         0         0         0          0

Packets Dropped In Processing by Priority

Priority          Total                5 sec avg 1 min avg 5 min avg 1 hour avg

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

Unknown                              0         0         0         0          0

Normal                           25259         0         0         0          0

Medium                             549         0         0         0          0

High                          30510351        27        19        20         20

Crucial                              0         0         0         0          0

Super Crucial                        0         0         0         0          0

Packets Not Enqueued by Reason

Reason            Total                5 sec avg 1 min avg 5 min avg 1 hour avg

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

RxQueueNotAvail                      0         0         0         0          0

RxNoBuffersAvail                     0         0         0         0          0

RxBadCpuEvent                        0         0         0         0          0

Testing                              0         0         0         0          0

Packets Dropped In Processing by Reason

Reason             Total                5 sec avg 1 min avg 5 min avg 1 hour avg

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

BadPddType                            0         0         0         0          0

VlanZeroBadCrc                        0         0         0         0          0

VlanZeroGoodCrc                       0         0         0         0          0

ReplVlan0GoodCrc                      0         0         0         0          0

NoPimPhyportMap                       0         0         0         0          0

NoPimPhyport                          0         0         0         0          0

UnimplementedEvt                      0         0         0         0          0

SrcAddrTableFilt                    547         0         0         0          0

NoL2Vlan                              0         0         0         0          0

STPDrop                               1         0         0         0          0

UnknownLyr-Bridge                     0         0         0         0          0

UnknownLyr-OutAcl                     0         0         0         0          0

L2DstDrop                             0         0         0         0          0

L2DstDropInAcl                        0         0         0         0          0

L2DstDropOutAcl                       0         0         0         0          0

AclNoVlan                             0         0         0         0          0

AclActionDrop                         0         0         0         0          0

AclActionRedirect                     0         0         0         0          0

AclActionUnsupptd                     0         0         0         0          0

UnknownBridgeAct                      0         0         0         0          0

NoTxInfo                              0         0         0         0          0

NoDstPorts                     30535609        27        19        20         20

NoFloodPorts                          1         0         0         0          0

ControlNoL2DstEnt                     0         0         0         0          0

InvalidAclAction                      0         0         0         0          0

AclInputErr                           0         0         0         0          0

OutAclEvntOnInAcl                     0         0         0         0          0

AclOutputErr                          0         0         0         0          0

ReservedPort                          0         0         0         0          0

EsmpNoTxInfo                          0         0         0         0          0

UnknownSource                         0         0         0         0          0

NoDriverTxPackets                     0         0         0         0          0

NoPimPort                             0         0         0         0          0

RouteLookupFailed                     0         0         0         0          0

FragPktAllocFailed                    0         0         0         0          0

IpHdrException                        0         0         0         0          0

SpanEvent                             0         0         0         0          0

Dot1xUnauthCtrlPkt                    0         0         0         0          0

No Sw port for ARP                    0         0         0         0          0

No Sw port for ESMP                    0         0         0         0          0

Total packet queues 16

Packets Received by Packet Queue

Queue                  Total           5 sec avg 1 min avg 5 min avg 1 hour avg

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

Esmp                                 0         0         0         0          0

L2/L3Control                 548361005        85        76        58         57

Host Learning                   245782         0         0         0          0

L3 Fwd High                          0         0         0         0          0

L3 Fwd Medium                   307222         0         0         0          0

L3 Fwd Low                    34926096         1         0         0          0

L2 Fwd High                          0         0         0         0          0

L2 Fwd Medium                        0         0         0         0          0

L2 Fwd Low                   226359049         5         0         1          3

L3 Rx High                           0         0         0         0          0

L3 Rx Low                            0         0         0         0          0

RPF Failure                          0         0         0         0          0

ACL fwd(snooping)                    0         0         0         0          0

ACL log, unreach                     0         0         0         0          0

ACL sw processing                    0         0         0         0          0

MTU Fail/Invalid                     0         0         0         0          0

Packets Dropped by Packet Queue

Queue                  Total           5 sec avg 1 min avg 5 min avg 1 hour avg

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

Esmp                                 0         0         0         0          0

L2/L3Control                      1839         0         0         0          0

Host Learning                     1675         0         0         0          0

L3 Fwd High                          0         0         0         0          0

L3 Fwd Medium                        0         0         0         0          0

L3 Fwd Low                         840         0         0         0          0

L2 Fwd High                          0         0         0         0          0

L2 Fwd Medium                        0         0         0         0          0

L2 Fwd Low                        2127         0         0         0          0

L3 Rx High                           0         0         0         0          0

L3 Rx Low                            0         0         0         0          0

RPF Failure                          0         0         0         0          0

ACL fwd(snooping)                    0         0         0         0          0

ACL log, unreach                     0         0         0         0          0

ACL sw processing                    0         0         0         0          0

MTU Fail/Invalid                     0         0         0         0          0

Packets Transmitted from CPU per Output Interface

Interface              Total           5 sec avg 1 min avg 5 min avg 1 hour avg

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

Gi1/1                                0         0         0         0          0

Gi1/2                                0         0         0         0          0

Gi1/3                                0         0         0         0          0

Gi1/4                                0         0         0         0          0

Gi1/5                                0         0         0         0          0

Gi1/6                                0         0         0         0          0

Gi1/7                                0         0         0         0          0

Gi1/8                                0         0         0         0          0

Gi1/9                                0         0         0         0          0

Gi1/10                               0         0         0         0          0

Gi1/11                               0         0         0         0          0

Gi1/12                               0         0         0         0          0

Gi1/13                               0         0         0         0          0

Gi1/14                               0         0         0         0          0

Gi1/15                               0         0         0         0          0

Gi1/16                               0         0         0         0          0

Gi1/17                               0         0         0         0          0

Gi1/18                               0         0         0         0          0

Gi1/19                               0         0         0         0          0

Gi1/20                               0         0         0         0          0

Gi1/21                               0         0         0         0          0

Gi1/22                               0         0         0         0          0

Gi1/23                               0         0         0         0          0

Gi1/24                               0         0         0         0          0

Gi1/25                               0         0         0         0          0

Gi1/26                               0         0         0         0          0

Gi1/27                               0         0         0         0          0

Gi1/28                               0         0         0         0          0

Gi1/29                               0         0         0         0          0

Gi1/30                               0         0         0         0          0

Gi1/31                               0         0         0         0          0

Gi1/32                               0         0         0         0          0

Gi1/33                               0         0         0         0          0

Gi1/34                               0         0         0         0          0

Gi1/35                               0         0         0         0          0

Gi1/36                               0         0         0         0          0

Gi1/37                               0         0         0         0          0

Gi1/38                               0         0         0         0          0

Gi1/39                               0         0         0         0          0

Gi1/40                               0         0         0         0          0

Gi1/41                               0         0         0         0          0

Gi1/42                               0         0         0         0          0

Gi1/43                               0         0         0         0          0

Gi1/44                               0         0         0         0          0

Gi1/45                               0         0         0         0          0

Gi1/46                               0         0         0         0          0

Gi1/47                               0         0         0         0          0

Gi1/48                               0         0         0         0          0

Packets Received at CPU per Input Interface

Interface              Total           5 sec avg 1 min avg 5 min avg 1 hour avg

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

Gi1/1                                0         0         0         0          0

Gi1/2                                0         0         0         0          0

Gi1/3                                0         0         0         0          0

Gi1/4                                0         0         0         0          0

Gi1/5                                0         0         0         0          0

Gi1/6                                0         0         0         0          0

Gi1/7                                0         0         0         0          0

Gi1/8                                0         0         0         0          0

Gi1/9                                0         0         0         0          0

Gi1/10                               0         0         0         0          0

Gi1/11                               0         0         0         0          0

Gi1/12                               0         0         0         0          0

Gi1/13                               0         0         0         0          0

Gi1/14                               0         0         0         0          0

Gi1/15                               0         0         0         0          0

Gi1/16                               0         0         0         0          0

Gi1/17                               0         0         0         0          0

Gi1/18                               0         0         0         0          0

Gi1/19                               0         0         0         0          0

Gi1/20                               0         0         0         0          0

Gi1/21                               0         0         0         0          0

Gi1/22                               0         0         0         0          0

Gi1/23                               0         0         0         0          0

Gi1/24                               0         0         0         0          0

Gi1/25                               0         0         0         0          0

Gi1/26                               0         0         0         0          0

Gi1/27                               0         0         0         0          0

Gi1/28                               0         0         0         0          0

Gi1/29                               0         0         0         0          0

Gi1/30                               0         0         0         0          0

Gi1/31                               0         0         0         0          0

Gi1/32                               0         0         0         0          0

Gi1/33                               0         0         0         0          0

Gi1/34                               0         0         0         0          0

Gi1/35                               0         0         0         0          0

Gi1/36                               0         0         0         0          0

Gi1/37                               0         0         0         0          0

Gi1/38                               0         0         0         0          0

Gi1/39                               0         0         0         0          0

Gi1/40                               0         0         0         0          0

Gi1/41                               0         0         0         0          0

Gi1/42                               0         0         0         0          0

Gi1/43                               0         0         0         0          0

Gi1/44                               0         0         0         0          0

Gi1/45                               0         0         0         0          0

Gi1/46                               0         0         0         0          0

Gi1/47                               0         0         0         0          0

Gi1/48                               0         0         0         0          0

Switch#

Can you please give me any idea why is it like that and what to do in order to eliminate this high drop rate?

Thanks in advance,

Vesko

2 ACCEPTED SOLUTIONS

Accepted Solutions
Cisco Employee

Too high drop rate indication

Hellom

Input ACL does not necesarily means ACL configured on the interface. It can be any check whcih packet is passing on input. So by that counter we can see that there are many packets continiously hitting the CPU for some reason.

So we need to find what are those packets to undertsnad why they are processed (and not HW) switched. To do it you may need to do the follwoing CPU sniffer capture:

debug platform packet all count
show platform cpu packet statistics    - this command will show which interfaces are getting most of these packets

debug platform packet all receive buffer
show platform cpu packet buffered     - this command will show what are those packets

 

Then you can analyze the packets and see if you can stop those - possibly they belong to single host and you can trace it by the source MAC. Let us know if you will need help examing the packets.

Both debugs are not harmfull.

You can check following link for more references:

http://www.cisco.com/en/US/customer/products/hw/switches/ps663/products_tech_note09186a00804cef15.shtml#tool1

Hope this helps,

Nik

Cisco Employee

Too high drop rate indication

What you are checking by this command are the CPU queues. Packets are assigned with different priorities based on functions and thus treated differently by CPU. E.g control packets and some traffic are treated as High priority, ICMP treated as low priority.

Here you just see that traffic punted to CPU is treated by it as High priotiy and handled appropriately. It does not give us much - mostly the way CPU handles it internally.

P.S. I'm Russian

Nik

3 REPLIES
Cisco Employee

Too high drop rate indication

Hellom

Input ACL does not necesarily means ACL configured on the interface. It can be any check whcih packet is passing on input. So by that counter we can see that there are many packets continiously hitting the CPU for some reason.

So we need to find what are those packets to undertsnad why they are processed (and not HW) switched. To do it you may need to do the follwoing CPU sniffer capture:

debug platform packet all count
show platform cpu packet statistics    - this command will show which interfaces are getting most of these packets

debug platform packet all receive buffer
show platform cpu packet buffered     - this command will show what are those packets

 

Then you can analyze the packets and see if you can stop those - possibly they belong to single host and you can trace it by the source MAC. Let us know if you will need help examing the packets.

Both debugs are not harmfull.

You can check following link for more references:

http://www.cisco.com/en/US/customer/products/hw/switches/ps663/products_tech_note09186a00804cef15.shtml#tool1

Hope this helps,

Nik

New Member

Too high drop rate indication

Hi Nik,

thanks for the fast asnwer.

Can I also ask you to let me know how to interprete the high rate of drops from the "Packets Dropped In Processing by Priority" section:

Packets Dropped In Processing by Priority

Priority          Total                5 sec avg 1 min avg 5 min avg 1 hour avg

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

Unknown                              0         0         0         0          0

Normal                           25259         0         0         0          0

Medium                             549         0         0         0          0

High                          30510351        27        19        20         20

Crucial                              0         0         0         0          0

Super Crucial                        0         0         0         0          0

Thanks in advance.

Vesko

P.S. Btw, are you Bulgarian? :-)

Cisco Employee

Too high drop rate indication

What you are checking by this command are the CPU queues. Packets are assigned with different priorities based on functions and thus treated differently by CPU. E.g control packets and some traffic are treated as High priority, ICMP treated as low priority.

Here you just see that traffic punted to CPU is treated by it as High priotiy and handled appropriately. It does not give us much - mostly the way CPU handles it internally.

P.S. I'm Russian

Nik

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