amber/green

Unanswered Question
Sep 22nd, 2009
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dear Exprts

I have switch 3750 i notes switch ports flash amber/green very fast

but connection is ok no lost .

Interfaces connected to indigo vision and pcs

is that normal ??? and what it,s reason

i heard its from mis match for duplex between switch port and interface for indigo vision .

But i put interface for indigo vision as 100 mgbs full duplex

and onother resone was about size of frame and kind of it,s encabsulation

but i used dotq on my switch

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Lucien Avramov Tue, 09/22/2009 - 17:50
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Do you have error messages on the switch?

Can you post your show log?

ahmed ibrahim Tue, 09/22/2009 - 17:54
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i will post it but after 12 hours when i take it frome switch

thank you very much for quick replay

ahmed ibrahim Thu, 09/24/2009 - 16:05
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no error message appears to me

this is the port status during problem

now i think it mis match duplex because i see the port is half duplex and indigo vision is full duplex

but this problem doesnot appeare permenant

it is some times only


FastEthernet1/0/28 is up, line protocol is up (connected)

Hardware is Fast Ethernet, address is 0022.bea4.f720 (bia 0022.bea4.f720)

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)

Half-duplex, 100Mb/s, media type is 10/100BaseTX

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 362000 bits/sec, 62 packets/sec

5 minute output rate 17000 bits/sec, 32 packets/sec

43827 packets input, 35284048 bytes, 0 no buffer

Received 0 broadcasts (0 multicasts)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

37089 packets output, 2783410 bytes, 0 underruns

0 output errors, 65 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 ou

ahmed ibrahim Thu, 09/24/2009 - 16:10
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no error message appears to me

this is the port status during problem

now i think it mis match duplex because i see the port is half duplex and indigo vision is full duplex

but this problem doesnot appeare permenant

it is some times only


FastEthernet1/0/28 is up, line protocol is up (connected)

Hardware is Fast Ethernet, address is 0022.bea4.f720 (bia 0022.bea4.f720)

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)

Half-duplex, 100Mb/s, media type is 10/100BaseTX

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 362000 bits/sec, 62 packets/sec

5 minute output rate 17000 bits/sec, 32 packets/sec

43827 packets input, 35284048 bytes, 0 no buffer

Received 0 broadcasts (0 multicasts)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

37089 packets output, 2783410 bytes, 0 underruns

0 output errors, 65 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 ou

Leo Laohoo Thu, 09/24/2009 - 16:37
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Fa1/0/28 is negotiated to Half duplex and there's a small amount of collision. If you enter the command sh contr e f1/0/28 from time to time, do you observe the various collision counters incrementing?

ahmed ibrahim Fri, 09/25/2009 - 16:06
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now it,s ok

no collision

and led is green

what is the reason for collision ????


Lucien Avramov Fri, 09/25/2009 - 16:47
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In a half duplex Ethernet network, a collision is the result of two devices on the same Ethernet network attempting to transmit data at exactly the same time. The network detects the "collision" of the two transmitted packets and discards them both. Collisions are a natural occurrence on Ethernets. Ethernet uses Carrier Sense Multiple Access/ Collision Detect (CSMA/CD) as its method of allowing devices to "take turns" using the signal carrier line. When a device wants to transmit, it checks the signal level of the line to determine whether someone else is already using it. If it is already in use, the device waits and retries, perhaps in a few seconds. If it isn't in use, the device transmits. However, two devices can transmit at the same time in which case a collision occurs and both devices detect it. Each device then waits a random amount of time and retries until successful in getting the transmission sent.

The best remedy for collisions is to upgrade to a full duplex switched environment.


Hope this addresses your questions

frederic.lemair... Mon, 11/23/2009 - 11:32
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Hi Lavramov,


Indigo Vision CCTV Racks are 10/100/1000 ethernet adapter and the adapters of the Indigo VIsion racks are working in auto-sense.


I also had the same problem with input/crc and output error when I fixed the speed to 100 and duplexing to full.


Do not fixe the speed and duplex anymore. Set both to auto and the issue will disappear.


Regards.

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