Hi SME and Engineers,
I got a duplex mismatch scenario here and need your opinion.
Scenario:
Router:
c1900-universalk9-mz.SPA.154-3.M1.bin
interface GigabitEthernet0/1
description LAN Port
ip address 103.224.122.49 255.255.255.248
ip tcp adjust-mss 1452
duplex auto
speed 100
no keepalive proto-up
GigabitEthernet0/1 is up, line protocol is up
Hardware is CN Gigabit Ethernet, address is b0aa.7764.47c1 (bia b0aa.7764.47c1)
Description: LAN Port
Internet address is 103.224.122.49/29
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full Duplex, 100Mbps, media type is RJ45
output flow-control is unsupported, input flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:07, output 00:00:00, output hang never
Last clearing of "show interface" counters 1w5d
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 207000 bits/sec, 74 packets/sec
5 minute output rate 344000 bits/sec, 79 packets/sec
126559062 packets input, 2781615399 bytes, 0 no buffer
Received 35921 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 35008 multicast, 0 pause input
133260637 packets output, 1942552617 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
35008 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
Switch:
Switch details:
Switch version: 03.06.04.E
interface GigabitEthernet1/0/46
description Connection Internet Line
switchport access vlan 99
speed 100
no cdp enable
GigabitEthernet1/0/46 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 74a2.e6a9.3aae (bia 74a2.e6a9.3aae)
Description: Connection Internet Line
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 2/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:38, 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: 3265536
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 965000 bits/sec, 104 packets/sec
5 minute output rate 161000 bits/sec, 82 packets/sec
3152236081 packets input, 2134901224894 bytes, 0 no buffer
Received 1491675 broadcasts (407018 multicasts)
0 runts, 0 giants, 0 throttles
28337 input errors, 28337 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 407018 multicast, 0 pause input
0 input packets with dribble condition detected
2928757149 packets output, 1204608383637 bytes, 0 underruns
3270906 output errors, 1802 collisions, 1 interface resets
373476 unknown protocol drops
0 babbles, 1458 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
The weirdest thing is when the router and switch sets to Full Duplex / 100 Speed, the interface will force a half duplex on both end causing packet lost.
If set to auto duplex, only it will register correctly like the above scenario.
Any ideas? I don't see any particular bugs on these two versions.
Regards,
ST
