LAN Switches flip the state frequently
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Posted by on June 5, 2008, 3:03 am
Please log in for more thread options Our office is now established with new devices Cat2960 & Cat3560, but I found the state changed frequently, as the following : Jun 5 09:33:43: %LINK-3-UPDOWN: Interface GigabitEthernet0/21, changed state to down Jun 5 09:33:45: %LINK-3-UPDOWN: Interface GigabitEthernet0/21, changed state to up Jun 5 11:56:30: %LINK-3-UPDOWN: Interface GigabitEthernet0/21, changed state to down Jun 5 11:57:01: %LINK-3-UPDOWN: Interface GigabitEthernet0/21, changed state to up Jun 5 12:43:26: %LINK-3-UPDOWN: Interface GigabitEthernet0/21, changed state to down Jun 5 12:43:44: %LINK-3-UPDOWN: Interface GigabitEthernet0/21, changed state to up .Jun 5 13:25:51: %LINK-3-UPDOWN: Interface GigabitEthernet0/21, changed state to down .Jun 5 13:26:15: %LINK-3-UPDOWN: Interface GigabitEthernet0/21, changed state to up Jun 5 14:23:05: %LINK-3-UPDOWN: Interface GigabitEthernet0/21, changed state to down Jun 5 14:23:09: %LINK-3-UPDOWN: Interface GigabitEthernet0/21, changed state to up gd-hko-sw2960-2# sh int gi0/21 GigabitEthernet0/21 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is 001f.2732.f395 (bia 001f. 2732.f395) 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 10/100/1000BaseTX input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:00:01, 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 5 minute output rate 1000 bits/sec, 1 packets/sec 1549674 packets input, 389814712 bytes, 0 no buffer Received 20830 broadcasts (4040 multicasts) 0 runts, 0 giants, 0 throttles 1 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 4040 multicast, 0 pause input 0 input packets with dribble condition detected 19451473 packets output, 2816921787 bytes, 0 underruns 0 output errors, 0 collisions, 1 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 gd-hko-sw2960-2# ------------------------------------- end------------------------------------ | ||||||||||||||||
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Posted by TeamGracie on June 5, 2008, 12:08 pm
Please log in for more thread options What does the interface on the other device look like? Are there error logs on that device? Can you do a show run int gig 0/21 for me also. | ||||||||||||||||
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Posted by Paul Matthews on June 5, 2008, 12:25 pm
Please log in for more thread options
>Jun 5 09:33:43: %LINK-3-UPDOWN: Interface GigabitEthernet0/21,
>changed state to down What is on G0/21? -- Paul Matthews CCIE #4063 Please post questions to the NG, NOT by e-mail. | ||||||||||||||||
>
> Our office is now established with new devices Cat2960 & Cat3560, but
> I found the state changed frequently, as the following :
>
> Jun =A05 09:33:43: %LINK-3-UPDOWN: Interface GigabitEthernet0/21,
> changed state to down
> Jun =A05 09:33:45: %LINK-3-UPDOWN: Interface GigabitEthernet0/21,
> changed state to up
> Jun =A05 11:56:30: %LINK-3-UPDOWN: Interface GigabitEthernet0/21,
> changed state to down
> Jun =A05 11:57:01: %LINK-3-UPDOWN: Interface GigabitEthernet0/21,
> changed state to up
> Jun =A05 12:43:26: %LINK-3-UPDOWN: Interface GigabitEthernet0/21,
> changed state to down
> Jun =A05 12:43:44: %LINK-3-UPDOWN: Interface GigabitEthernet0/21,
> changed state to up
> .Jun =A05 13:25:51: %LINK-3-UPDOWN: Interface GigabitEthernet0/21,
> changed state to down
> .Jun =A05 13:26:15: %LINK-3-UPDOWN: Interface GigabitEthernet0/21,
> changed state to up
> Jun =A05 14:23:05: %LINK-3-UPDOWN: Interface GigabitEthernet0/21,
> changed state to down
> Jun =A05 14:23:09: %LINK-3-UPDOWN: Interface GigabitEthernet0/21,
> changed state to up
> gd-hko-sw2960-2# =A0 =A0sh int gi0/21
> GigabitEthernet0/21 is up, line protocol is up (connected)
> =A0 Hardware is Gigabit Ethernet, address is 001f.2732.f395 (bia 001f.
> 2732.f395)
> =A0 MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
> =A0 =A0 =A0reliability 255/255, txload 1/255, rxload 1/255
> =A0 Encapsulation ARPA, loopback not set
> =A0 Keepalive set (10 sec)
> =A0 Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
> =A0 input flow-control is off, output flow-control is unsupported
> =A0 ARP type: ARPA, ARP Timeout 04:00:00
> =A0 Last input never, output 00:00:01, output hang never
> =A0 Last clearing of "show interface" counters never
> =A0 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops:
> 0
> =A0 Queueing strategy: fifo
> =A0 Output queue: 0/40 (size/max)
> =A0 5 minute input rate 0 bits/sec, 0 packets/sec
> =A0 5 minute output rate 1000 bits/sec, 1 packets/sec
> =A0 =A0 =A01549674 packets input, 389814712 bytes, 0 no buffer
> =A0 =A0 =A0Received 20830 broadcasts (4040 multicasts)
> =A0 =A0 =A00 runts, 0 giants, 0 throttles
> =A0 =A0 =A01 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
> =A0 =A0 =A00 watchdog, 4040 multicast, 0 pause input
> =A0 =A0 =A00 input packets with dribble condition detected
> =A0 =A0 =A019451473 packets output, 2816921787 bytes, 0 underruns
> =A0 =A0 =A00 output errors, 0 collisions, 1 interface resets
> =A0 =A0 =A00 babbles, 0 late collision, 0 deferred
> =A0 =A0 =A00 lost carrier, 0 no carrier, 0 PAUSE output
> =A0 =A0 =A00 output buffer failures, 0 output buffers swapped out
> gd-hko-sw2960-2#
> -------------------------------------
> end------------------------------------