07-26-2007 09:48 AM - edited 03-05-2019 05:31 PM
Hi.Is there a way to view which ports have been inactive for a long time on a switch i.e. no one has connected to them and/or no traffic has been passed on them for some time?
Thanks in advance for any help.
07-26-2007 09:48 AM
Thanks for the replies.One more question.I have used the show command on one interface and in the last input line it displays the following:
FastEthernet6/2 is up, line protocol is up (connected)
Hardware is Fast Ethernet Port, address is 000f.90b7.d061 (bia 000f.90b7.d061)
Description: [--- telephone connection ---]
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, link type is auto, media type is 10/100BaseTX
input flow-control is unsupported output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 16w4d, output never, output hang never
There is a PC connected to the port but it says the last input was over 4 months ago.Shouldn't the last input line show a much smaller value, probably in seconds?
08-01-2007 06:45 AM
Interesting, are the input/output packets increasing ?
08-01-2007 06:48 AM
Yes.
74 packets input, 9152 bytes, 0 no buffer
Received 2 broadcasts (0 multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
2223 packets output, 222022 bytes, 0 underruns
After a couple of minutes:
188 packets input, 38164 bytes, 0 no buffer
Received 3 broadcasts (0 multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
5286 packets output, 494429 bytes, 0 underruns
08-01-2007 06:57 AM
Also I just checked a Cisco 4500 and I see the same thing happening. I checked a port where just recently a PC was added and is working.
It shows also that the last input was some weeks ago but the input/output count of packets keeps rising.
08-01-2007 07:08 AM
That's odd, then the Last input entry is meaningless. I'll have to investigate on that. In the meantime, I suggest you follow my other recommendation and clear the counter, wait a few weeks then check for ports with 0 packets.
08-01-2007 07:21 AM
Already did it on both 2960 an 4500.I'll wait a couple of weeks than see what's happening with ports.
I agree that the last input entry is meaningless if it doesn't display proper values.
08-01-2007 06:14 AM
Hi Friend,
I cannot recall any short cut to get the details of all ports at once. Yes you can issue a command "sh interface
GigabitEthernet1/0/3 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 0018.186e.7d83 (bia 0018.186e.7d83)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:23, output 00:00:01, output hang never
In last line of the output where it says last input 00:00:23 this explains number of hours, minutes, and seconds since the last packet was successfully received by an interface.
In interface is in down down status it will show last input never.
HTH
Ankur
08-01-2007 06:23 AM
Ah ! Great input there Ankur. I totally missed the last input|output field on the interface output.
With that said, the OP can issue.
show int | i Fast|(Last input)
08-01-2007 08:24 AM
a 2960 won't keep this kind of info but if you ever need it on a 4500 just use the "show interface link " command and this will show you the last time it was used.
08-01-2007 06:16 AM
I'm afraid the switch won't keep historical data as to the last time the port was used.
My only recommendation is to clear the counters now, wait couple of weeks, then run the following command:
sh int | i Fast|0 packets
This command will display all interfaces in the switch that have 0 packets (in/out) since you last cleared the interface - which means those ports have not been used for that duration.
HTH,
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