Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Cisco Switch Port giving Crazy Stats

Hey Guys

This Problem has been giving me sleepless nights from a Month now.

We have a cisco 4006. We run OSPF and BGP. There are two ports on the

switch that are connected to the Core Routers. The Stats on these ports

are crazy.

Here is what I get when I see these Interfaces

FastEthernet2/48 is up, line protocol is up

Hardware is Fast Ethernet Port, address is

Internet address is X.X.X.251/28

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 251/255, rxload 3/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s

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

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

Last clearing of "show interface" counters 6w2d

Input queue: 31402/75/0/0 (size/max/drops/flushes); Total output

drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 1383000 bits/sec, 920 packets/sec

5 minute output rate 500224000 bits/sec, 33987277 packets/sec

2481037660 packets input, 454955876 bytes, 0 no buffer

Received 3267143 broadcasts, 0 runts, 0 giants, 0 throttles

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

0 input packets with dribble condition detected

2047853408 packets output, 1214833509 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 output buffer failures, 0 output buffers swapped out

FastEthernet2/47 is up, line protocol is up

Hardware is Fast Ethernet Port, address is

Internet address is X.X.X.232/28

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 246/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s

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

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

Last clearing of "show interface" counters 6w2d

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 96648000 bits/sec, 5310567 packets/sec

1046861 packets input, 123914863 bytes, 0 no buffer

Received 934185 broadcasts, 0 runts, 0 giants, 0 throttles

1987 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 input packets with dribble condition detected

363290167 packets output, 3566189248 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 output buffer failures, 0 output buffers swapped out

These are 100Mb ports. Howcan they do like 500 Mb/sec. Doesnt make

sense to me.

The Ports would be less than 100Mb at one moment and then just shoot up

to 300-400 Mb another moment with millions of packets per second.

Doesnt make sense to me. However, the MRTG never shows more than 9-10

Mb. Any Clues.

Any help will be appreciated.

Thanx

3 REPLIES
New Member

Re: Cisco Switch Port giving Crazy Stats

Hi 2 things to clarify

1) FastEthernet2/48 is up, line protocol is up is this port working fine or not

2) we can try to reduce the polling intervel of MRTG to 30 sec and monitor the same

New Member

Re: Cisco Switch Port giving Crazy Stats

Well..

The Port is working Fine. However, what I wonder is If the stats are these, there is something wrong .

Secondly, I have even ran a sniffer on the port. The port shows very nominal traffic coming out of the Port to the Core Switch. Makes me think that the packets might be getting dropped.

Any Clues.

Thanx for the Help

Silver

Re: Cisco Switch Port giving Crazy Stats

From the looks of the interfaces you are extremely loading it down on the TX load. However you state that you see nominal traffic on the SPAN. Possibly your SPAN port is not configured correctly and you are only capturing traffic from a specific port and not the VLAN itself. Also change your load interval timer to 30secs. That will give you a more true reading of the interface...

160
Views
0
Helpful
3
Replies
CreatePlease to create content