interface input counters ??????

Ben Alex · ‎05-12-2010

GigabitEthernet0/1 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 0011.5c75.2a71 (bia 0011.5c75.2a71)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
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
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:01, output hang never
Last clearing of "show interface" counters 00:23:46
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 4348000 bits/sec, 16 packets/sec
5 minute output rate 3369000 bits/sec, 858 packets/sec
     22967 packets input, 1029143199 bytes, 0 no buffer
     Received 22970 broadcasts (19240 multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

Am I missing something here in the explanation:

1029143199 bytes divide by 22967 packets = 44Kbytes roughly

Wireshark shows average on 700 Bytes

Also, the 19240multicast out of 22967 makes no sense at all ( as per sniffer)

or if we look at it the other way 4348000 bits/sec divide by 8 and divide by 16 packets/sec = roughly 34K

Thanks for helping

Ganesh Hariharan · ‎05-12-2010

GigabitEthernet0/1 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 0011.5c75.2a71 (bia 0011.5c75.2a71)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
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
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:01, output hang never
Last clearing of "show interface" counters 00:23:46
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 4348000 bits/sec, 16 packets/sec
5 minute output rate 3369000 bits/sec, 858 packets/sec
     22967 packets input, 1029143199 bytes, 0 no buffer
     Received 22970 broadcasts (19240 multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

Am I missing something here in the explanation:

1029143199 bytes divide by 22967 packets = 44Kbytes roughly

Wireshark shows average on 700 Bytes

Also, the 19240multicast out of 22967 makes no sense at all ( as per sniffer)

or if we look at it the other way 4348000 bits/sec divide by 8 and divide by 16 packets/sec = roughly 34K

Thanks for helping

Hi,

You want to have bandwidth calculation for this interface, If yes then try with below example

As you know

1 byte (B) = 8 bits (b)

1 Kilobit (Kb) = 1024 bits
1 Megabit (Mb) = 1024 Kb or 1,048,576 bits ect.

So 10,000 packets per second of 64 byte packets (don't forget to calculate your CRC on top of that that adds 4 bytes, so it is really 68 bytes) is as follows;

68 bytes x 8 = 544 bits
10000 packets per second x 544 bits per packet = 5,440,000 bits per second
5440000 bits per second / 1024 bits per kilobits = 5,312.5 Kbps
5312.5 Kbps /1024 Kb/Mb = 5.18798828125 Mbps

and for multicast packets on this interface can packets moving between the switch ports for stp also.

Hope to Help !!

Ganesh.H

If helpful do rate the post

Ben Alex · ‎05-13-2010

Hi:

Thanks for trying but you are not answering the question at all.

Read the comments after the show interface