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
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: