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Community Member

2960g connection issue


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?


Community Member

Re: 2960g connection issue

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

Community Member

Re: 2960g connection issue


Multple VLAN's? Is trunking setup? Please provide a little more info.

sho run

sho int

sho int stat

sho int trunk

Community Member

Re: 2960g connection issue

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


Re: 2960g connection issue

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 .

Community Member

Re: 2960g connection issue

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

Thanks everyone.

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