Connectivity loss

Hi 
There are some projectors  it shows connected but when i ping i cant reach 
I tried extended ping from  the same vlan , no success .
i tried to ping broadcast address no success.
it works only when do a port shut or no shut 
What could be the problem 
Please help 
Thank you 

Hi Akash
The projector connected on a layer 3650x which is connected to the distribution switch using trunk .
Actually i  am not following   that " you can check interface counters both sides to check direction of packet drop."   Please kindly explain 
I checked the arp entry on distribution side , i did not find anything . The arp entry available only after shut or no shut on the interface . 
Does a faulty cable can be the cause of the problem ? 
Thank you 

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    Type escape sequence to abort.
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    iadsl-tlx-staana-2#debug atm packet interface atm6/0/1.1
    ATM packets debugging is on
    Displaying packets on interface ATM6/0/1.1
    iadsl-tlx-staana-2#show debug
    Generic ATM:
      ATM packets debugging is on
    Oct 10 13:32:00: ATM6/0/1.1(O):
    VCD:0x1 VPI:0x2 VCI:0x20 DM:0x100 SAP:AAAA CTL:03 OUI:000000 TYPE:0800 Length:0x70
    Oct 10 13:32:00: 4500 0064 109B 0000 FF01 7459 C97A 51DE C97A 51D1 0800 7504 0049 0002 0000
    Oct 10 13:32:00: 0001 7FCD 892C ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD
    Oct 10 13:32:00: ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD
    Oct 10 13:32:00: ABCD ABCD ABCD ABCD ABCD
    Oct 10 13:32:00:
    Oct 10 13:32:01: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
    Oct 10 13:32:02: ATM6/0/1.1(O):
    VCD:0x1 VPI:0x2 VCI:0x20 DM:0x100 SAP:AAAA CTL:03 OUI:000000 TYPE:0800 Length:0x70
    Oct 10 13:32:02: 4500 0064 109C 0000 FF01 7458 C97A 51DE C97A 51D1 0800 6D23 0049 0003 0000
    Oct 10 13:32:02: 0001 7FCD 910C ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD
    Oct 10 13:32:02: ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD
    Oct 10 13:32:02: ABCD ABCD ABCD ABCD ABCD
    Oct 10 13:32:02:
    Oct 10 13:32:03: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
    Oct 10 13:32:04: ATM6/0/1.1(O):
    VCD:0x1 VPI:0x2 VCI:0x20 DM:0x100 SAP:AAAA CTL:03 OUI:000000 TYPE:0800 Length:0x70
    Oct 10 13:32:04: 4500 0064 109D 0000 FF01 7457 C97A 51DE C97A 51D1 0800 6552 0049 0004 0000
    Oct 10 13:32:04: 0001 7FCD 98DC ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD
    Oct 10 13:32:04: ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD
    Oct 10 13:32:04: ABCD ABCD ABCD ABCD ABCD
    Oct 10 13:32:04:
    Oct 10 13:32:04: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
    Oct 10 13:32:04: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
    Oct 10 13:32:05: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
    Oct 10 13:32:05: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
    Oct 10 13:32:05: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
    Oct 10 13:32:05: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
    Oct 10 13:32:05: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
    Oct 10 13:32:05: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
    Oct 10 13:32:06: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
    Oct 10 13:32:06: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
    Oct 10 13:32:07: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
    Oct 10 13:32:07: ATM Auto sensing: Not changing encap in threshold time. Dropping frame.
    Verifying the PVC counters:
    ATM6/0/1.1: VCD: 1, VPI: 2, VCI: 32
    UBR, PeakRate: 128 (302 cps)
        CDVT: 714.0 Usecs, High Watermark: 56, Low Watermark: 48
    AAL5-LLC/SNAP, etype:0x0, Flags: 0x1040, VCmode: 0x0, Encapsize: 12
    OAM frequency: 0 second(s), OAM retry frequency: 1 second(s)
    OAM up retry count: 3, OAM down retry count: 5
    OAM Loopback status: OAM Disabled
    OAM VC Status: Not Managed
    OAM Loop detection: Disabled
    ILMI VC status: Not Managed
    InARP frequency: 15 minutes(s)
    High Watermark: 56, Low Watermark: 48
    InPkts: 0, OutPkts: 0, InBytes: 0, OutBytes: 0
    InPRoc: 0, OutPRoc: 423, Broadcasts: 0
    InFast: 0, OutFast: 0
    InPktDrops: 0, OutPktDrops: 0
    Out CLP=1 Pkts: 0
    OAM cells received: 0
    F5 InEndloop: 0, F5 InSegloop: 0, F5 InAIS: 0, F5 InRDI: 0
    OAM cells sent: 5
    F5 OutEndloop: 5, F5 OutSegloop: 0, F5 OutAIS: 0, F5 OutRDI: 0
    OAM cell drops: 0
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    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 201.122.81.209, timeout is 2 seconds:
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    software version:
    12.2(33)SB10
    LC:
    4oc3atm-1
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    elporsche & Juli

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