Sunday, June 29, 2014

How to know ISP router is hard code with duplex

How to know is the unmanageable router is it hard code with duplex

herewith example

ISP Router hard code with duplex

Router#sh run int fa0/1
Building configuration...

Current configuration : 166 bytes
!
interface FastEthernet0/1
 ip address 10.154.88.1 255.255.255.0
 no ip redirects
 no ip proxy-arp
 ip mtu 1400
 ip tcp adjust-mss 1300
 speed 100
 full-duplex
end

Router#

Manageable Switch

Switch#sh int fa0/2
FastEthernet0/2 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 9caf.cab5.eb02 (bia 9caf.cab5.eb02)
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Half-duplex, 100Mb/s, media type is 10/100BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:10, output 00:00:00, 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
     405 packets input, 55364 bytes, 0 no buffer
     Received 129 broadcasts (23 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 23 multicast, 0 pause input
     0 input packets with dribble condition detected
     2147 packets output, 183411 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out
Switch#sh run int fa0/2
Building configuration...

Current configuration : 33 bytes
!
interface FastEthernet0/2
end

Switch#

Logging from manageable switch 


*Mar  1 01:34:08.938: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet0/2 (not full duplex)

From above I know that the ISP/unmanageable router is hard code with duplex.

This also apply to laptop or server which hard code with duplex.

herewith my laptop hard code with duplex full duplex

Switch#sh int fa0/5
FastEthernet0/5 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 9caf.cab5.eb05 (bia 9caf.cab5.eb05)
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Half-duplex, 100Mb/s, media type is 10/100BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:01, 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 1000 bits/sec, 1 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     1449 packets input, 143021 bytes, 0 no buffer
     Received 1274 broadcasts (194 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 194 multicast, 0 pause input
     0 input packets with dribble condition detected
     1292 packets output, 97129 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out
Switch#









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