From: Bill Eyer (beyer@optonline.net)
Date: Tue Jun 24 2008 - 08:02:18 ART
For a short term check use show interface, which will give you the 5
minute running averages. Mine show 0 because this scrap is from a lab.
If they are at or near interface speed you are congested. A good rule
of thumb is that anything over %70of capacity is an issue, although with
higher speed interfaces you can probably bend that rule a little. To
trend over a longer term you need a network management system.
Bill
R1#sh int f0/0
FastEthernet0/0 is up, line protocol is up
Hardware is AmdFE, address is 000f.8f9d.7260 (bia 000f.8f9d.7260)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00::18, 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 0 bits/sec, 0 packets/sec -- Check this
line
5 minute output rate 0 bits/sec, 0 packets/sec -- Check this line
176 packets input, 39791 bytes
Received 176 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
317 packets output, 50583 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
1 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped
Muhammad Nasim wrote:
> Dear all,
>
> I want to know how one can know that is there any congestion on router or
> switch interface.
>
> Can someone point me any link for share his hands on experience
>
> Thanks
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