09-10-2003 10:29 PM - edited 03-02-2019 10:15 AM
Has anyone seen the following output showing that the duplex is UNKNOWN, the far end says that the duplex is full. Is this an issue? What can cause this?
I tried to set the duplex but there is only a speed command.
CORE#show int g5/1
GigabitEthernet5/1 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet Port, address is 0002.b934.e50a (bia 0002.b934.e5
0a)
Description: Link to AC-01(G0/11)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Unknown duplex, 1000Mb/s, link type is auto, media type is SX
output flow-control is unsupported, input flow-control is unsupported, 1000Mb/
s
input flow-control is off, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (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
14092269 packets input, 1374524334 bytes, 0 no buffer
Received 9782884 broadcasts (0 multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
24841600 packets output, 302064542 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
CORE#
09-11-2003 01:53 PM
Which platform and software version. We had few bugs for this in IOS based CAT4k and 3550's as well. It is cosmetic only and later sofware releases have a fix.
09-11-2003 02:32 PM
Thanks for the reply,
The software is as follows:
4507:
IOS (tm) Catalyst 4000 L3 Switch Software (cat4000-IS-M), Version 12.1(14)E1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
The 4500 is connected to a 3550:
IOS (tm) C3550 Software (C3550-I5Q3L2-M), Version 12.1(13)EA1a, RELEASE SOFTWARE (fc1)
Do you feel that it is in F-duplex?
I have also configured etherchannel on the gig-ports and was wondering if this could affect the grouping if it is not in F-duplex mode? I am useing dot1.q for the trunks is this a problem?
Thanks for you advise.
09-11-2003 03:41 PM
Hi,
If it is not causing a performance problem, than it is due to bug CSCdz89143. For the $k, the latest release 12.1(19)E1 should have the fix.
-Robert
09-11-2003 04:16 PM
Gig links are always full-duplex. Upgrade to 19E or 19EW1 and this issue should be fixed. Also, on a side note, the IOS you are running on the 4507 is deferred
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