10-15-2008 06:17 AM - edited 03-06-2019 01:56 AM
Is there auto-negotiation when you connect a router FaX/X to a switch interface? I know how to check if speed and duplex are auto in a Switch... how can you see this in a router (command)?
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11-12-2008 07:17 PM
hi, from your question, i believe to use the follwing command to know either auto-nego or not:
"show run int fax/x" to see the configuration of a particular interface. If you do not see Speed 100 and duple-full, then your port is auto-nego.
10-15-2008 06:52 AM
Yes there is auto-negotiation providing the switch port is set up for auto-negotiation. If you wanted to set the interface to a specific speed/duplex on a router interface
int fa0/0
speed 100
duplex full
Jon
10-15-2008 07:01 AM
My specific question is how can I see (which command) that an interface chose the speed and duplex setting with auto-negotiation? With a switch you use the sh int status command... what command do you use in a router?
Thanks.
10-15-2008 07:05 AM
Sorry i wasn't specific enough. If there are not speed/duplex entries under the interface configuration then it is using auto-negotiation. That is how you can tell.
Jon
10-15-2008 09:37 PM
Try using "show interface
You should get an output similar to the following. I have marked the point where the duplex is displayed.
FastEthernet0 is up, line protocol is up
Hardware is xxx, address is 0018.19c2.fc8c (bia 0018.19c2.fc8c)
Internet address is A.B.C.D/24
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)
*********************************
Full-duplex, 100Mb/s, 100BaseTX/FX
*********************************
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: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 153000 bits/sec, 69 packets/sec
5 minute output rate 137000 bits/sec, 77 packets/sec
26788744 packets input, 2250783189 bytes
Received 1 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
27330053 packets output, 2049402608 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Regards,
Andrew
10-16-2008 04:47 AM
...show interfaces status -
10-17-2008 05:32 AM
The output of "show interfaces" shows the speed and duplex settings but it doesn't show if it got those settings by auto-negotiation or manually... how to know if it got them with auto-negotiation?.
11-11-2008 10:31 AM
If there is nothing connected to it you can tell by, if it would say auto where it shows duplex and speed. See below is a show interface of a port set to auto.
11-12-2008 07:17 PM
hi, from your question, i believe to use the follwing command to know either auto-nego or not:
"show run int fax/x" to see the configuration of a particular interface. If you do not see Speed 100 and duple-full, then your port is auto-nego.
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