We have a 3825 running IOS (C3825-ADVIPSERVICESK9-M), Version 12.4(25), RELEASE SOFTWARE (fc2). We have a number of VLANs defined, and several FastEthernet ports are members of them.
When I attempt to add GigabitEthernet 0/1 to a VLAN, it fails with the error:
Enter configuration commands, one per line. End with CNTL/Z.
3825-B-Geno(config)#interface GigabitEthernet 0/1
3825-B-Geno(config-if)#switchport access vlan 714
% Invalid input detected at '^' marker.
This same command works perfectly on any of the FastEthernet ports.
I don't see trunking enabled:
3825-B-Geno#sho int GigabitEthernet 0/1
GigabitEthernet0/1 is down, line protocol is down
Hardware is BCM1125 Internal MAC, address is XXXX.XXXX.XXXX (bia XXXX.XXXX.XXXX)
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Unknown duplex, Unknown Speed, media type is RJ45
output flow-control is XON, input flow-control is XON
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 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
3 output errors, 0 collisions, 2 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
3 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
How can I get this interface to join the VLAN?