About L2switch and PC connected to Catalyst2960S with Cate5 (2pair)

[morimori3]

Hi,

L2switch and PC are connected to Catalyst2960S with Cate5 (2pair).

NIC of L2switch or PC corresponds to 10/100/1000BASE-T.

2960S,L2switch, and PC are auto negotiation.

Although the connection state of L2switch is linkdown,

the connection state of PC is linkup (100BASE-TX).

Why does L2switch is linkdown?

Regards

[handoko wiyanto]

Hi,

Can you post the show run for that interface

And show interface?

Regards,

Sent from Cisco Technical Support iPad App

[morimori3]

hi,

Thanks for your reply.

----Port connected L2Switch ---

Cat2960S#show int gi1/0/15

GigabitEthernet1/0/15 is down, line protocol is down (notconnect)

Hardware is Gigabit Ethernet, address is (bia )

MTU 1500 bytes, BW 10000 Kbit/sec, DLY 1000 usec,

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

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Auto-duplex, Auto-speed, 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 never, 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 0 bits/sec, 0 packets/sec

0 packets input, 0 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

0 packets output, 0 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

0 unknown protocol drops

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

Cat2960S#

Cat2960S#show run int gi1/0/15

Building configuration...

!

interface GigabitEthernet1/0/15

end

Cat2960S#

------------------------

----Port connected PC---

Cat2960S#show int gi1/0/9

GigabitEthernet1/0/9 is up, line protocol is up (connected)

Hardware is Gigabit Ethernet, address is (bia )

MTU 1500 bytes, BW 100000 Kbit/sec, 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 never, output 00:00:06, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 670

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 5000 bits/sec, 2 packets/sec

4083535 packets input, 835231693 bytes, 0 no buffer

Received 20129 broadcasts (605 multicasts)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 605 multicast, 0 pause input

0 input packets with dribble condition detected

16042859 packets output, 8298142862 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

0 unknown protocol drops

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

Cat2960S#

Cat2960S#show run int gi1/0/9

Building configuration...

!

interface GigabitEthernet1/0/9

end

Cat2960S#

------------------------

Regards

[handoko wiyanto]

hi,

----Port connected L2Switch ---

Cat2960S#show int gi1/0/15

GigabitEthernet1/0/15 is down, line protocol is down (notconnect)

Hardware is Gigabit Ethernet, address is (bia )

base on that info,

and the input/output counter of packet/frame which all zero.

it behaves like you dont connect the cable to this port or using wrong type of cable or using bad cable.

what kind of cable do you use for connecting between the switch?

if both switch have auto mdi/mdix feature then it doesnt matter wether you using straight or cross cable.

regards,

[Leo Laohoo]

Kindly do the following commands:

1.  test cab tdr int gi1/0/15;

2.  Wait for approximately 5 to 7 seconds;

3.  sh cable tdr int gi1/0/15; and

4.  Please post the output.

[Sebastian Helmer]

Hi

With only a 2 pair cable u could get Trouble with mdi/mdix..Try a Cross cable and if that does Not help Try also to fix Speed and Duplex

Regards

Sebastian

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