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how to set "duplex auto, speed auto" in F0/0

thanks.
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robinyanwang
Asked:
robinyanwang
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1 Solution
 
robinyanwangAuthor Commented:
and what is "load-interval 30" for?
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robinyanwangAuthor Commented:
I know it is a very simple question...I did look through some books and could not find the syntax for it

-R
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robinyanwangAuthor Commented:
here is what I got

2621(config-if)#duplex auto
                    ^
% Invalid input detected at '^' marker.
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giltjrCommented:
load-interval specifies the time period that is used to calulate load stats in seconds.

What version of IOS are you running?

What commands did you enter before entering duplex auto?
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robinyanwangAuthor Commented:
2621#config t
Enter configuration commands, one per line.  End with CNTL/Z.
2621(config)#int f0/0
2621(config-if)#duplex auto
                    ^
% Invalid input detected at '^' marker.

IOS (tm) C2600 Software (C2600-C-M), Version 12.0(3)T3,  RELEASE SOFTWARE (fc1)
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robinyanwangAuthor Commented:
also i found
'ip domain name ofw.mrn'

what does the .mrn mean?

thanks.
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giltjrCommented:
Well somebody has told your switch that the IP domain name is ofw.mrn.

When you get the error is the ^ really underneath the #?

What you are doing should work.

What do you get when you issue the command "show int f0/0"?
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robinyanwangAuthor Commented:
it is a router, no a switch
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robinyanwangAuthor Commented:
FastEthernet0/0 is up, line protocol is down
  Hardware is AmdFE, address is 00d0.0606.5340 (bia 00d0.0606.5340)
  Description: To LAN 10.10.10.0/24
  Internet address is 10.10.10.1/24
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliablility 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Half-duplex, 100Mb/s, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:04, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
  30 second input rate 0 bits/sec, 0 packets/sec
  30 second output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast
     0 input packets with dribble condition detected
     1117 packets output, 69925 bytes, 0 underruns
     0 output errors, 0 collisions, 2 interface resets
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robinyanwangAuthor Commented:
!
interface FastEthernet0/0
 description To LAN 10.10.10.0/24
 ip address 10.10.10.1 255.255.255.0
 no ip directed-broadcast
 ip nat inside
 load-interval 30
!


I could see duplex auto and speed auto in another router's sh run, that is why i try to add it to my router.
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robinyanwangAuthor Commented:
also what is the 'no ip directed-broadcast'...I do not see it from another router...
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giltjrCommented:
opps, yes router.  Today from Cicso the two are just about interchangable.

What happens if you enter the command "speed auto" and then "duplex auto"?
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giltjrCommented:
O.K. Which model 2600 is this exactly?  

The IOS level seems to be back level.  I am trying to find the doc for that level to see if you could even set auto.  It could be that the options are full/half for duplex and 10/100 for speed.

Setting Duplex to auto will only help if you are connecting it to a device that supports full duplex.  If the device you are connecting to support full duplex, it is better to set duplex to full.  

When you set to auto and both side support full or half duplex you end up with one of three basic posibilities:

   FULL <---> FULL
    HALF <---> HALF
    FULL/HALF <----> HALF/FULL

The last one meaning that one side is HALF and one side is FULL.  Thest last one is BAD, causes major problems.  The middle one is not really bad, but you could bet slightly better performance if they were in the 1st one.  So hard codeing full duplex is the best if both sides support full duplex.





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lrmooreCommented:
To set a router interface to auto speed/duplex:

given:
 interface fast 0/0
  speed 100
  full-duplex

Just remove the speed and duplex settings:
 interface fast 0/0
  no speed 100
  no full-duplex

Now your config looks like this:
  interface fast 0/0
    ip address z.z.z.z 255.255.255.xxx

The absence of any speed/duplex settings means the interface is indeed in "auto" mode
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giltjrCommented:
Yesterday while trying to help I read in one Cisco doc that "no full-duplex" was the same as duplex half.  When I saw your post I went back to make sure I read it correctly.

On some of the Cicso equipment "no full-duplex" is the same as "duplex half" on others it sets the duplex to auto.

Reading a bit more it looks like "no full-duplex" will reset the LAN adapter to the default duplex.  So if the default is half-duplex, it is reset to half-duplex.  If the default is auto, it resets it to auto.  

Wonder if the same thing is true of no speed 100, resets to default, whatever that may be.
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lrmooreCommented:
Was your post in the right thread, Scott?

@gltjr -
You are 100% correct that "no full-duplex" or "no speed 100" reverts the interface back to the default state. Given the information "FastEthernet0/0 " means that this is most likely a 10/100 interface and the default is "auto" in the vast majority of cases.

If the interface was "Ethernet0/0" (no "Fast"), then the old default was indeed half-duplex, but some versions could be manually set to full-duplex, 10Mb only. Depending on how far back you go, Ethernet interfaces were fixed at 10/half.

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Scotty_ciscoCommented:
Your right wrong thread please disreguard...

Thanks
Scott
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robinyanwangAuthor Commented:
HR-2621#config t
Enter configuration commands, one per line.  End with CNTL/Z.
HR-2621(config)#int f0/0
HR-2621(config-if)#speed 100
                    ^
% Invalid input detected at '^' marker.

HR-2621(config-if)#duplex auto
                    ^
% Invalid input detected at '^' marker.


IOS (tm) C2600 Software (C2600-C-M), Version 12.0(3)T3,  RELEASE SOFTWARE (fc1)

it is a Cisco 2621 router
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