Re: Ping drops

Hi,

Am getting CRC errors and input errors that can be for which reason?? Router
C is the ISP device router A and B is in my control and running MPLS in
between them and MTU size btween them is 1524.Layer 2 trunk is configured
between C and B and a SVI is created to cummnicate to router C.

The key point i wanna tell u is if the MTU is not define while pinging
,,the success rate is 100%

sh interface for B

Router-B #sh interfaces vlan XX
VlanXX is up, line protocol is up
  Hardware is EtherSVI, address is 001d.7198.bc00 (bia 001d.7198.bc00)
    Internet address is X.X.X.X/X
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not supported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:19, output 00:00:19, output hang never
  Last clearing of "show interface" counters 20:13:44
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
  L2 Switched: ucast: 2414 pkt, 170278 bytes - mcast: 0 pkt, 0 bytes
  L3 in Switched: ucast: 55274 pkt, 9712088 bytes - mcast: 0 pkt, 0 bytes
mcast
  L3 out Switched: ucast: 1213 pkt, 90975 bytes mcast: 0 pkt, 0 bytes
     57688 packets input, 9882366 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     58935 packets output, 9776944 bytes, 0 underruns
     0 output errors, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out

sh interface on A

Router--A #sh interfaces t1/1
TenGigabitEthernet1/1 is up, line protocol is up (connected)
  Hardware is C6k 10000Mb 802.3, address is 001e.13e5.08c0 (bia
001e.13e5.08c0)
    Internet address is X.X.X.X/X
  MTU 1524 bytes, BW 10000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Carrier delay is 0 msec
  Full-duplex, 10Gb/s
  input flow-control is off, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:02, output hang never
  Last clearing of "show interface" counters 24w6d
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 42000 bits/sec, 7 packets/sec
  5 minute output rate 102000 bits/sec, 12 packets/sec
  L2 Switched: ucast: 2510607 pkt, 284517486 bytes - mcast: 5014037 pkt,
502588486 bytes
  L3 in Switched: ucast: 27484640 pkt, 4089035241 bytes - mcast: 0 pkt, 0
bytes mcast
  L3 out Switched: ucast: 62961890 pkt, 56037590371 bytes mcast: 0 pkt, 0
bytes
     35288706 packets input, 4992780739 bytes, 0 no buffer
     Received 5293236 broadcasts (0 IP multicasts)
     0 runts, 2411 giants, 0 throttles
     76 input errors, 65 CRC, 11 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     73469711 packets output, 57321041866 bytes, 0 underruns
     0 output errors, 0 collisions, 2 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

On Mon, Oct 19, 2009 at 12:01 PM, Thameem Maranveetil Parambath <
security.goodie_at_gmail.com> wrote:

> You should get 100% success rate.. Check for sh interface command on the
> interface connecting A and B , also B and C and see if you are getting any
> errors/discards etc.
>
> Regards
> Thameem
>
> On Mon, Oct 19, 2009 at 11:01 AM, adam gibs <adamgibs7_at_gmail.com> wrote:
>
>> friends,
>>
>> A----------B---------------------C
>>
>> when i try to ping from A to C by 1500 byte with repeat count of 10000 the
>> success rate is 98% and sometimes 97%.Is it something i have to go deep to
>> troubleshoot or it is normal???? and what troubleshooting can i do for
>> such
>> situation,The MTU configured on interface is 1520.
>>
>> Success rate is 98 percent (986/1000), round-trip min/avg/max = 1/1/16 ms
>>
>> The devices A and B is 6500 switch with negligble traffic flowing through
>> it.
>>
>> Thanks
>>
>>
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Received on Mon Oct 19 2009 - 12:27:04 ART