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Gre Tunnel Output drops errors

Dear All,

I have seen an error in GRE configured between two routers over WAN.  i am monitoring the WAN link and GRe tunnel via WhatsupGold NMS and it reported that Gre tunnel having packet loss sometimes and this time it affects the services and traffic passing over tunnel.

sh int t101 shows output drops . is that the problem ? i have read that i have to adjust MTC size but i tried to change the tunnel MTU to 1400 but still sh int t101 shows MTU as 1514 ? What could be the problem of output drops in my tunnel link. this is only error i am seeing .

SiteA #sh int t101

Tunnel101 is up, line protocol is up

  Hardware is Tunnel

  Description:  Internet address is 172.18.1.1/30

  MTU 1514 bytes, BW 2048 Kbit/sec, DLY 500000 usec,

    reliability 255/255, txload 1/255, rxload 5/255

  Encapsulation TUNNEL, loopback not set

  Keepalive set (60 sec), retries 2

  Tunnel source 172.16.172.82, destination 172.31.186.254

  Tunnel protocol/transport GRE/IP

    Key disabled, sequencing disabled

    Checksumming of packets disabled

  Tunnel TTL 255

  Fast tunneling enabled

  Tunnel transmit bandwidth 8000 (kbps)

  Tunnel receive bandwidth 8000 (kbps)

  Last input 00:00:00, output 00:00:00, output hang never

  Last clearing of "show interface" counters 1w4d

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 179

  Queueing strategy: fifo

  Output queue: 0/0 (size/max)

  5 minute input rate 48000 bits/sec, 13 packets/sec

  5 minute output rate 0 bits/sec, 1 packets/sec

    11172631 packets input, 2233002357 bytes, 0 no buffer

    Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

    0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

    1663202 packets output, 148126571 bytes, 0 underruns

    0 output errors, 0 collisions, 0 interface resets

    0 output buffer failures, 0 output buffers swapped out

SiteB#sh int t101

Tunnel101 is up, line protocol is up

  Hardware is Tunnel

  Description:  Internet address is 172.18.1.2/30

  MTU 1514 bytes, BW 2048 Kbit/sec, DLY 500000 usec,

    reliability 255/255, txload 5/255, rxload 1/255

  Encapsulation TUNNEL, loopback not set

  Keepalive set (60 sec), retries 2

  Tunnel source 172.31.186.254, destination 172.16.172.82

  Tunnel protocol/transport GRE/IP

    Key disabled, sequencing disabled

    Checksumming of packets disabled

  Tunnel TTL 255

  Fast tunneling enabled

  Tunnel transmit bandwidth 8000 (kbps)

  Tunnel receive bandwidth 8000 (kbps)

  Last input 00:00:02, output 00:00:02, output hang never

  Last clearing of "show interface" counters 7w6d

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/0 (size/max)

  5 minute input rate 1000 bits/sec, 1 packets/sec

  5 minute output rate 46000 bits/sec, 19 packets/sec

    31399204 packets input, 2675546039 bytes, 0 no buffer

    Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

    0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

    347796910 packets output, 1364546113 bytes, 0 underruns

    0 output errors, 0 collisions, 0 interface resets

    0 output buffer failures, 0 output buffers swapped out

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Gre Tunnel Output drops errors

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