2960g connection issue

Unanswered Question
Jul 13th, 2009


I have a 2960 connected to a 3560 at 100/full. The port shows up w/ errors but I cannot ping the vlan on the 2960.

Auto mdix is on. Any thoughts?


I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
sudip.acharya1 Mon, 07/13/2009 - 05:18

In addition, the 3560 port stat's showing a large amount of packets with errors. I already swapped out the cables but didnt help.

sudip.acharya1 Mon, 07/13/2009 - 12:10

When I set Speed and Duplex to auto, the port status is UP (connects at 100/half). Any other combo (100/auto or auto/Full, etc) results in the port to be down.

Here is the sho int:

FastEthernet0/18 is up, line protocol is up (connected)

Hardware is Fast Ethernet, address is 0014.1cd8.0394 (bia 0014.1cd8.0394)

Description: CLTSW102 MGMT 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)

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 00:00:00, output 00:00:03, output hang never

Last clearing of "show interface" counters 04:13:13

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

11392 packets input, 837637 bytes, 0 no buffer

Received 10505 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 9317 multicast, 0 pause input

0 input packets with dribble condition detected

1072 packets output, 117964 bytes, 0 underruns

0 output errors, 0 collisions, 7 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

Sho int vlan:

cltsw01#sho int trunk

Port Mode Encapsulation Status Native vlan

Gi0/1 on 802.1q trunking 1

Gi0/2 on 802.1q trunking 1

Gi0/3 on 802.1q trunking 1

Port Vlans allowed on trunk

Gi0/1 1-2,5,119

Gi0/2 1-2,5-6,119

Gi0/3 1-2,5

Port Vlans allowed and active in management domain

Gi0/1 1-2,5,119

Gi0/2 1-2,5-6,119

Gi0/3 1-2,5

Port Vlans in spanning tree forwarding state and not pruned

Gi0/1 1-2,5,119

Gi0/2 1-2,5-6,119

Gi0/3 1-2,5

glen.grant Mon, 07/13/2009 - 13:35

The port will show down with anything other than auto for speed and duplex because you are using mdix which only works when the port is set as auto . If you want to hardcode the speeds and duplex then you will have to get a crossover cable to go to the other switch. If using mdix then set "both" ends as auto and it should negotiate ok .

sudip.acharya1 Mon, 07/13/2009 - 14:35

This has been resolved. We did not specify the encapsulation type.

Thanks everyone.


This Discussion