show controller cpu-interface command

[sarahr202]

Hi everybody

The command show controller cpu-interface according to my book shows the number of packets being forwarded to  switch's cpu for processing.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_55_se/commmand/reference/cli2.html#wp3353215

The above cisco links says:

Use the show controllers cpu-interface privileged EXEC command to display the state of the CPU network interface ASIC and the send and receive statistics for packets reaching the CPU.

.

What is CPU network interface Asic?   I am familiar with internal registers  CPU uses to perform mathematical operation but what is CPU network interface?

I will appreciate your input.

thanks and have a great weekend.

[Reza Sharifi · Accepted solution]

Hi Sarah,

Here the output of that commnad from a 3750, since your link is also from a 3750 config reference:

Switch#sh controllers cpu-interface

ASIC    Rxbiterr   Rxunder    Fwdctfix   Txbuflos   Rxbufloc   Rxbufdrain

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

ASIC0     0          0          0          0          0          0        

ASIC1     0          0          0          0          0          0        

ASIC2     0          0          0          0          0          0        

cpu-queue-frames  retrieved  dropped    invalid    hol-block  stray

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

rpc               0          0          0          0          0        

stp               1          0          0          0          0        

ipc               0          0          0          0          0        

routing protocol  28312      0          0          0          0        

L2 protocol       0          0          0          0          0        

remote console    0          0          0          0          0        

sw forwarding     0          0          0          0          0        

host              7648       0          0          0          0        

broadcast         462103     0          0          0          0        

cbt-to-spt        0          0          0          0          0        

igmp snooping     35916      0          0          0          0        

icmp              0          0          0          0          0        

logging           0          0          0          0          0        

rpf-fail          0          0          0          0          0        

dstats            0          0          0          0          0        

cpu heartbeat     22302361   0          0          0          0        

Supervisor ASIC receive-queue parameters

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

queue 0 maxrecevsize 7E0 pakhead 43EE568 paktail 445EE7C

queue 1 maxrecevsize 7E0 pakhead 46896F4 paktail 3E32E9C

queue 2 maxrecevsize 7E0 pakhead 451AFB0 paktail 4537A14

queue 3 maxrecevsize 7E0 pakhead 4C00264 paktail 4BFFB2C

queue 4 maxrecevsize 7E0 pakhead 46A629C paktail 46C2D00

queue 5 maxrecevsize 7E0 pakhead 4A1EBC4 paktail 4A2CF28

queue 6 maxrecevsize 7E0 pakhead 4BCEE48 paktail 4BEB8AC

queue 7 maxrecevsize 7E0 pakhead 4A66C6C paktail 4A57E34

queue 8 maxrecevsize 7E0 pakhead 4A6DD94 paktail 4A6E4CC

queue 9 maxrecevsize 7E0 pakhead 48A1420 paktail 48A1420

queue A maxrecevsize 7E0 pakhead 487FC98 paktail 4879EC0

queue B maxrecevsize 7E0 pakhead 4C09408 paktail 4C0CA2C

queue C maxrecevsize 7E0 pakhead 48AC004 paktail 48C16E8

queue D maxrecevsize 7E0 pakhead 489D91C paktail 48A0F40

queue E maxrecevsize 0 pakhead 0 paktail 0

queue F maxrecevsize 7E0 pakhead 486E8E0 paktail 486F3B4

Supervisor ASIC exception status

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

Receive overrun    00000000   Transmit overrun 00000000

FrameSignatureErr  00000000   MicInitialize    00000002

BadFrameErr        00000000   LenExceededErr   00000000

BadJumboSegments   00000000

Supervisor ASIC Mic Registers

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

MicDirectPollInfo               80000200

MicIndicationsReceived          00000000

MicInterruptsReceived           00000001

MicPcsInfo                      0000001F

MicPlbMasterConfiguration       00000000

MicRxFifosAvailable             00000000

MicRxFifosReady                 0000BFFF

MicTimeOutPeriod:       FrameTOPeriod: 00000EA6 DirectTOPeriod: 00004000

MicTransmFramesCopied           00000003

MicTxFifosAvailable             0000000E

MicConfiguration:       Conf flag: 00000110     Interrupt Flag: 00000008

MicReceiveFifoAssignmen Queue 0 - 7: 33333333   Queue 8 - 15:33333333

MicReceiveFramesReady:  FrameAvailable: 00000000        frameAvaiMask: 00000000

MicException:   

        Exception_flag  00000000

        Message-1       00000000

        Message-2       00000000

        Message-3       00000000

MicIntRxFifo:

        ReadPtr         00000780        WritePtr        00000780

        WHeadPtr        00000780        TxFifoDepth     C0000800

MicIntTxFifo:

        ReadPtr         00000FA8        WritePtr        00000FA8

        WHeadPtr        00000FA8        TxFifoDepth     C0000800

MicDecodeInfo:

Fifo0:  address:        03FF5000 asic_num:      00000100

Fifo1:  address:        03FF4000 asic_num:      00000101

MicTransmitFifoInfo:

Fifo0:   StartPtrs:     0E2C9000        ReadPtr:        0E2C9270

        WritePtrs:      0E2C9270        Fifo_Flag:      8A800800

        Weights:        001E001E

Fifo1:   StartPtrs:     0E027400        ReadPtr:        0E027660

        WritePtrs:      0E027660        Fifo_Flag:      89800400

        Weights:        000A000A

MicReceiveFifoInfo:

Fifo0:  StartPtr:       0E4AA000        ReadPtr:        0E4AAFA0

        WritePtrs:      0E4AA000        Fifo_Flag:      8B000060

        writeHeaderPtr: 0E4AA000

Fifo1:  StartPtr:       0E786800        ReadPtr:        0E786808

        WritePtrs:      0E786808        Fifo_Flag:      89800400

        writeHeaderPtr: 0E786808

Fifo2:  StartPtr:       0E73F000        ReadPtr:        0E73F000

        WritePtrs:      0E73F000        Fifo_Flag:      89800400

        writeHeaderPtr: 0E73F000

Fifo3:  StartPtr:       0E99B800        ReadPtr:        0E99B8C8

        WritePtrs:      0E99B8C8        Fifo_Flag:      89800400

        writeHeaderPtr: 0E99B8C8

Fifo4:  StartPtr:       0E7CE000        ReadPtr:        0E7CE000

        WritePtrs:      0E7CE000        Fifo_Flag:      89800400

        writeHeaderPtr: 0E7CE000

Fifo5:  StartPtr:       0E87A600        ReadPtr:        0E87A600

        WritePtrs:      0E87A600        Fifo_Flag:      88800200

        writeHeaderPtr: 0E87A600

Fifo6:  StartPtr:       0E951C00        ReadPtr:        0E951C00

        WritePtrs:      0E951C00        Fifo_Flag:      89800400

        writeHeaderPtr: 0E951C00

Fifo7:  StartPtr:       0E8C1400        ReadPtr:        0E8C1738

        WritePtrs:      0E8C1738        Fifo_Flag:      89800400

        writeHeaderPtr: 0E8C1738

Fifo8:  StartPtr:       0E92DE00        ReadPtr:        0E92DF10

        WritePtrs:      0E92DF10        Fifo_Flag:      88800200

        writeHeaderPtr: 0E92DF10

Fifo9:  StartPtr:       0E2DB4D8        ReadPtr:        0E2DB4D8

        WritePtrs:      0E2DB4D8        Fifo_Flag:      82800008

        writeHeaderPtr: 0E2DB4D8

Fifo10: StartPtr:       0E817800        ReadPtr:        0E817860

        WritePtrs:      0E817860        Fifo_Flag:      88800200

        writeHeaderPtr: 0E817860

Fifo11: StartPtr:       0E2C8F00        ReadPtr:        0E2C8F00

        WritePtrs:      0E2C8F00        Fifo_Flag:      86800080

        writeHeaderPtr: 0E2C8F00

Fifo12: StartPtr:       0E844800        ReadPtr:        0E844B00

        WritePtrs:      0E844800        Fifo_Flag:      89000100

        writeHeaderPtr: 0E844800

Fifo13: StartPtr:       0E4A9E80        ReadPtr:        0E4A9E80

        WritePtrs:      0E4A9E80        Fifo_Flag:      86800080

        writeHeaderPtr: 0E4A9E80

Fifo14: StartPtr:       00000000        ReadPtr:        00000000

        WritePtrs:      00000000        Fifo_Flag:      00800000

        writeHeaderPtr: 00000000

Fifo15: StartPtr:       0E027940        ReadPtr:        0E027958

        WritePtrs:      0E027958        Fifo_Flag:      84800020

        writeHeaderPtr: 0E027958

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

Complete Board Id:0x0068

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

Switch#  show controller cpu-interface

So, this command is all about queue-frames  retrieved  dropped by the CPU.

HTH

Reza

[sarahr202]

Thanks Reza.

I got the idea how we can use this command to determine number of packets currently in queues, dropped or processed by cpu. However I was puzzled by the term " cpu network interface ASIC and your example which also showed ASIC0.ASIC1 etc.

Thanks and have a great weekend.

[Giuseppe Larosa · Accepted solution]

Hello Sarah,

you are going very deep in your studies of TBSHOOT!

>> What is CPU network interface Asic?   I am familiar with internal registers  CPU uses to perform mathematical operation but what is CPU network interface?

This referes to the internal anatomy of a multilayer switch:

traffic arrives on external ports.  The ports are divided in groups. Each group of port is managed by an ASIC chip that is specialized hardware. Each ASIC chip needs to interface to the main cpu in order to be able to send and receive packets that is to send packets that need to be process switched and to receive the responses from the main cpu.

So you can imagine a small internal network inside the switch that interconnects the ASICs that manage the port groups to the main cpu.

Another ASIC may act as front-end between port groups ASIC chips and the main cpu, so you get a cpu network interface ASIC.

My guess is that ASIC0, ASIC1 and so on are the port groups ASICs

Hope to help

Giuseppe

[sarahr202]

thanks Giuseppe

Have a great weekend.