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Can i get communication between a gig port and a fast ethernet port?

Below is what i got in the terminal. i have a catalyst 3560 24-POE connected to a Modem-Router. It is posible to get communication between the gig port and the Modem-router port?


GigabitEthernet0/2 is down, line protocol is down (err-disabled)
Hardware is Gigabit Ethernet, address is 001d.707c.c782 (bia 001d.707c.c782)
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Auto-duplex, Auto-speed, link type is auto, media type is unknown
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

VIP Mentor

GigabitEthernet0/2 is down, line protocol is down (err-disabled)  - what modem router other side ?


its in error disabled mode,


do the below steps :


config t


interface gi 0/2


no shutdown




connect the interface to modem and test, if this is still now working

change the speed to 100 and with no negotiation command.


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Hall of Fame Community Legend

Post the complete output to the command "sh interface status err".

As others have mentioned it's down because of err-disabled. error-disabled can happen because of belwo reasons:

Duplex Mismatch
Loopback Error
Link Flapping (up/down)
Port Security Violation
Unicast Flodding
UDLD Failure
Broadcast Storms
BPDU Guard


Please run  below command and see the reason of err-disabled:

show interfaces status err-disabled


Do you have port security or BPDU guard  enabled on the port ? 

if not , I suspect it's duplex mismatch , Is your other switch half duplex?  Try changing the speed and duplex manually and see if the port comes up?

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