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Traffic Dropping on GE Port of RSP-720-G3C

I am facing traffic packet drop on Link configured having 1Gbps, 1550 MTU.

Trends for Particular time in which Drop is observed with time stamps is as follows.

Time/Date

OKH-MAX-PE1/Interface   Gig5/1

Tx Load

Rx Load

Output Drops

28-09-2012   19:30

211/255

186/255

338837855

28-09-2012   19:45

211/255

180/255

348098579

28-09-2012   20:15

211/255

177/255

350955306

28-09-2012   20:30

211/255

177/255

357192835

28-09-2012   21:15

202/255

165/255

357475906

28-09-2012   21:50

180/255

148/255

357475906

29-09-2012   12:50

163/255

141/255

357475906

29-09-2012   15:30

153/255

132/255

357475906

when load goes about more than 80% as following 211/255, packets start dropping.

Configuration from Router interface is as follows.

GigabitEthernet5/1 is up, line protocol is up (connected)

  Hardware is c7600 1Gb 802.3, address is 0022.5518.3fc0 (bia 0022.5518.3fc0)

  Description: *** LINK TO P1-OKHLA GSR Router ***

  Internet address is 10.181.128.53/30

  MTU 1550 bytes, BW 1000000 Kbit, DLY 10 usec,

     reliability 255/255, txload 156/255, rxload 136/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 1000Mb/s, media type is SX

  input flow-control is off, output flow-control is off

  Clock mode is auto

  ARP type: ARPA, ARP Timeout 04:00:00

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

  Last clearing of "show interface" counters 2d20h

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 310709838

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 534651000 bits/sec, 635607 packets/sec

  5 minute output rate 613727000 bits/sec, 723368 packets/sec

  L2 Switched: ucast: 79126 pkt, 36183942 bytes - mcast: 49940 pkt, 5229686 bytes

  L3 in Switched: ucast: 110464038283 pkt, 11439486084444 bytes - mcast: 0 pkt, 0 bytes mcast

  L3 out Switched: ucast: 129612943916 pkt, 12574503387497 bytes mcast: 0 pkt, 0 bytes

     110451503404 packets input, 11438245863117 bytes, 0 no buffer

     Received 49939 broadcasts (0 IP multicasts)

     0 runts, 5920678 giants, 0 throttles

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

     0 watchdog, 0 multicast, 0 pause input

     0 input packets with dribble condition detected

     129254526578 packets output, 13573920110669 bytes, 0 underruns

     0 output errors, 0 collisions, 1 interface resets

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier, 0 pause output

     0 output buffer failures, 0 output buffers swapped out

Please suggest what/How i can check for this packet loss.

BR

Sourav

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