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interface auto negotiation behavior

malshara
Cisco Employee
Cisco Employee

Hello ,

 

I have an issue or it is not an issue more than strange configuration ,I have 7200 router reloaded unexpectedly after the reload I can see under a specific interface "negotiation auto" command despite of the interface is hard coded.

 

interface GigabitEthernet0/2
 bandwidth 100000
 ip address X.X.X.X X.X.X.X
 no ip redirects
 no ip unreachables
 ip route-cache flow
 load-interval 30
 duplex full
 speed 1000
 media-type gbic
 negotiation auto
 hold-queue 4096 in
 hold-queue 4096 out
GigabitEthernet0/2 is up, line protocol is up 
  Hardware is BCM1250 Internal MAC, address is 0017.e00d.951a (bia 0017.e00d.951a)
   MTU 1500 bytes, BW 100000 Kbit, DLY 10 usec, 
     reliability 255/255, txload 2/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, link type is autonegotiation, media type is ZX
  output flow-control is XON, input flow-control is XON
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/4096/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/4096 (size/max)
  30 second input rate 244000 bits/sec, 409 packets/sec
  30 second output rate 851000 bits/sec, 372 packets/sec
     918496369 packets input, 71232031047 bytes, 0 no buffer
     Received 3090 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
     853416996 packets output, 118898480459 bytes, 0 underruns
     2 output errors, 0 collisions, 1 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     2 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

 

 

is there anyone can assist in this ?

 

thanks in advance .

 

Regards

1 Reply 1

Leo Laohoo
Hall of Fame
Hall of Fame
media type is ZX

Ok, so the port has GBIC.  This means auto-negotiation is disabled and the port will automatically go into full 1000, full duplex.

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