Facing slowness problem in inter and intra vlan network.

[roy.rahul]

Hi Guys.

We are using 2 Nexus 5010 switches and 10 N2248TP fex in our network. From last couple of days we are facing slowness of speed while transferring the data between servers of same vlan and other vlan also. we just upgraded the NX-OS of the N5K, from 4.2 to 5.0. I also check the reliability at both ends N5K and core switch end. Reliabilty at N5K is 255, but at 6500 end it is varying.

One of my friend also suggest to me capture the traffic on the port of N5K using packet sniffer but as far as i know it only support from port number 1 to 8 of N5K, but due to some problem we are not able to do that.

As you all know the ports are gig interfaces, I also checked the traffic on interfaces and it is showing in KBs, which is I think normal.

Please help me to get this resolve.

Let me know if you need more information.

[manju.cisco]

Hi Rahul,

Please check if any of the uplink port might be operating at half-duplex.

For less reliability, do you see any interface errors?

You can also try changing the physical cable at 6500 end.

Is the CPU utilization ok ?

Regards,

Manjunath

[roy.rahul]

Hi Manju

I checked the interface errors and it looks fine means there are less

interface errors. And I also check he cpu utilization at n5k end and it

also looks good.

But when I check the transceivers details on which the FEX are connected it

shows the low rx power which is near about -14 to -19 which should be below

-9 (i think).

On Sat, Feb 18, 2012 at 11:46 AM, manju.cisco <

[glen.grant]

  If the reliability is less than 255 I would concentrate your efforts there.  Usually it will end up being a link issue of some type .  On the 6500 it means the input side is having issues if reliability is less than 255  .  Do a "show int count errors"  on the 6500 and see if you have any kind of errors on that port.

[roy.rahul]

Hi Glen

I Checked these things in our network

N5k-02# show interface po 20

port-channel20 is up

...

  TX

    790490271 unicast packets  1087642360 multicast packets  68156043 broadcast packets

    1951188058 output packets  1165629908843 bytes

    561388059 jumbo packets

    4899384 output errors  0 collision  0 deferred  0 late collision

...

N5k-02# show interface po 20

port-channel20 is up

... 

  TX

    790490271 unicast packets  1087642360 multicast packets  68156043 broadcast packets

    1951188058 output packets  1165629908843 bytes

    561388059 jumbo packets

    4899384 output errors  0 collision  0 deferred  0 late collision

...

N5k-02# show interface po 21

port-channel21 is up

...

  TX

    175617896 unicast packets  1089368787 multicast packets  72209289 broadcast packets

    1340485189 output packets  411976690403 bytes

    95206895 jumbo packets

    3289217 output errors  0 collision  0 deferred  0 late collision

...

N5k-02# show interface po 1

port-channel1 is up

  RX

    17811453216 unicast packets  197999631 multicast packets  21806634 broadcast packets

    18124651262 input packets  10301861996607 bytes

    4163629941 jumbo packets  0 storm suppression packets

    0 giants  93391716 input error  0 short frame  0 overrun   0 underrun

...

  TX

    23777606752 unicast packets  979391112 multicast packets  50653545 broadcast packets

    24827147262 output packets  21363197421163 bytes

    10892515864 jumbo packets

    19495853 output errors  0 collision  0 deferred  0 late collision

...

N5k-01# show interface po 1

...

RX

    23777513880 unicast packets  979405024 multicast packets  50653907 broadcast packets

    24827691239 input packets  21363864658141 bytes

    10892910708 jumbo packets  0 storm suppression packets

    0 giants  20118413 input error  0 short frame  0 overrun   0 underrun

...

  TX

    17908407199 unicast packets  198972933 multicast packets  21836545 broadcast packets

    18129253476 output packets  10303612322248 bytes

    4164246244 jumbo packets

    36799 output errors  0 collision  0 deferred  0 late collision

...

N5k-01# show inter e1/15 transceiver detail

Ethernet1/15

    transceiver is present

    type is 10Gbase-SR

    name is CISCO-FINISAR

    part number is FTLX8571D3BCL-CS

    revision is E

    serial number is FNS143800D2

    nominal bitrate is 10300 MBit/sec

    Link length supported for 50/125um fiber is 80 m

    Link length supported for 50/125um fiber is 300 m

    Link length supported for 62.5/125um fiber is 20 m

    cisco id is --

    cisco extended id number is 4

           Transceiver Detail Diagnostics Information (internal calibration)

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

                Current              Alarms                  Warnings

                Measurement     High        Low         High          Low

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

  Temperature   42.38 C        75.00 C     -5.00 C     70.00 C        0.00 C

  Voltage        3.29 V         3.63 V      2.97 V      3.46 V        3.13 V

  Current        8.31 mA       11.80 mA     4.00 mA    10.80 mA       5.00 mA

  Tx Power       -2.20 dBm       1.69 dBm  -11.30 dBm   -1.30 dBm     -7.30 dBm

  Rx Power      -11.19 dBm --    1.99 dBm  -13.97 dBm   -1.00 dBm     -9.91 dBm

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

  Note: ++  high-alarm; +  high-warning; --  low-alarm; -  low-warning

Please let me know what you get from this.