[kparhi]

HeloMy dear friends. I am new to this community. Hope we will enjoy on sharing knowledge among us.In my router one ethernet port fa0/1 led is not blinking after connecting with switch port. Shows fa0/1 is up , line protocal is down. Plz helpWith warm regards

[auglan]

If line protocol is down that means layer 2 isnt working. Is the port connecting to the switch in a up/up state? Check for speed duplex mismatches. Is this a trunk link? If so make sure trunking is configured on the switch side and the proper encapsualtion and vlans are set correctly on the sub-interfaces on the router. If possible post configs.

[guitarZen]

Can you post the output of your "show int fa 0/1" for me? By looking at that we probably determine the problem. Be sure you have issued the "no shutdown" command on the interface for the router (make sure that the interface on the device it is connected to isn't administratively down either). Also be sure that the cable is good.

[auglan]

If that port was administratively down he wouldnt get an interface up for that interface. As I stated check the switchport to see if that is admin down, check speed/duplex settings (auto negotiate by default and really no need to hardcode this these days)

[guitarZen]

Yeah I didn't read thoroughly enough.

At any rate the fact the interface is up/down be sure that the cable is completely plugged into the switch. If that is the case that swap cables (be sure you are using a straight through cable if you are connecting to another switch). If that doesn't work try a different port if possible on your switch. Finally if that doesn't work, then I suggest putting up a hard loop plug on your interface just to see if that will bring it up to rule out the router's interface.

[kparhi]

Originally Posted by guitarZen

Can you post the output of your "show int fa 0/1" for me? By looking at that we probably determine the problem. Be sure you have issued the "no shutdown" command on the interface for the router (make sure that the interface on the device it is connected to isn't administratively down either). Also be sure that the cable is good.

Hi, Guitarzen This is the outcome of sh int fa0/1( at cable unpluged) CHQ-Router>sh int fa0/1 FastEthernet0/1 is up, line protocol is down Hardware is MV96340 Ethernet, address is 0017.59cd.d101 (bia 0017.59cd.d101) 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) Auto-duplex, Auto Speed, 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:00:00, output hang never Last clearing of "show interface" counters 3d00h Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 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 input packets with dribble condition detected 26656 packets output, 1606857 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out CHQ-Router> where as other port fa0/0 is working fine now and its out come is as folow:- CHQ-Router>sh int f0/0 FastEthernet0/0 is up, line protocol is up Hardware is MV96340 Ethernet, address is 0017.59cd.d100 (bia 0017.59cd.d100) Internet address is 192.9.51.36/24 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 3d01h Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 30 second input rate 589000 bits/sec, 287 packets/sec 30 second output rate 724000 bits/sec, 106 packets/sec 13882469 packets input, 2440870581 bytes Received 197056 broadcasts, 0 runts, 0 giants, 0 throttles 330 input errors, 0 CRC, 0 frame, 0 overrun, 330 ignored 0 watchdog 0 input packets with dribble condition detected 8431243 packets output, 2602541770 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out CHQ-Router> yes! I have joined the cable just unpluging fron Fa0/0 while both switch and router are up. This is for your further advice plz. With warm regards

[kparhi]

Hi Guitarzen,

Hope u r unable to give ur valuable time? Can U tell me in what way I can test the ethernet port of my router or any SW for the same?

All the best