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Difference between sh int output in 12.1(13)EA1 and 12.1(19)EA1

Hello,

here I have sh int output of 12.1(13)EA1 on Cat2950:

GigabitEthernet0/1 is up, line protocol is up(connected)

Hardware is Gigabit Ethernet, address is 000b.fd08.f0f2 (bia 000b.fd08.f0f1)

MTU 1500 bytes, BW 1000000 Kbit, DLY 1000 usec,

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

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 1000Mb/s

Link type is autonegotiation, media type is SX

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

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 1d18h

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 286000 bits/sec, 3 packets/sec

5 minute output rate 4000 bits/sec, 2 packets/sec

4577625 packets input, 2711785589 bytes, 0 no buffer

Received 1584889 broadcasts, 0 runts, 0 giants, 0 throttles

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

0 watchdog, 1584209 multicast, 0 pause input

0 input packets with dribble condition detected

2736005 packets output, 701606101 bytes, 0 underruns

0 output errors, 0 collisions, 0 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

And same switch with 12.1(19)EA1:

GigabitEthernet0/1 is up, line protocol is up (connected)

Hardware is Gigabit Ethernet, address is 000b.fd08.f0f2 (bia 000b.fd08.f0f1)

MTU 1500 bytes, BW 1000000 Kbit, DLY 1000 usec,

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

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

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

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

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 never

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 108000 bits/sec, 33 packets/sec

5 minute output rate 35000 bits/sec, 24 packets/sec

43974521 packets input, 3007085736 bytes, 0 no buffer

Received 24611567 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 24547025 multicast, 0 pause input

0 input packets with dribble condition detected

17942111 packets output, 1543226158 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

You can see difference between two outputs after "Received xyz broadcasts" in 12.1(19) is "(0 multicast)". What is meaning of this?

What is difference between this counter and multicast counter two rows under that in brackets?

Also almost 34% in first output and 56% in second of input packets are broadcast(multicasts). Can I troubleshoot source of that traffic somehow without sniffer ?

Regards,

Mladen

1 REPLY
Bronze

Re: Difference between sh int output in 12.1(13)EA1 and 12.1(19)

i am not sure what the difference is. I always use the "show interface counters" and "show interface counters errors" for troubleshooting ethernet links on the 2950/3550. Its much easier then reading the show interface output.

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