I have a numbers of serial links. I am using 3700,2600 and 1941 series router.Recently I am experienced a trouble in my 3700 and 1941 series router. Problem is as belows:
The seral link goes off . It shows that the serial is up but the line protocol is down.The e1 controller is alwas up.For testing link, I set the local loopback and found that teh link is still down. After some time , the link gets up autometically. Please see the sh interface result before and after loop back. Please help as soon as possible and feel free to querey.
Serial0/2:0 is up, line protocol is down
Hardware is GT96K Serial
Description: XXXX LINK
Internet address is 172.16.254.50/30
MTU 1500 bytes, BW 1984 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, LCP Listen
Closed: CDPCP, PPPMUXCP, IPCP, loopback not set
Last input 00:00:08, output 00:00:06, output hang never
Last clearing of "show interface" counters 7w6d
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 51
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
1075084 packets input, 330059814 bytes, 0 no buffer
Received 0 broadcasts, 228 runts, 0 giants, 0 throttles
looking at your output, there seems to be a physical problem with either your cabling, the modem attached to your serial interface, or the interface(s) themselves. The high number of input errors, CRC, frame, and overrun errors point to such a phyiscal problem. If possible, try and replace the cable, switch to another interface, or have your ISP run a loopback test to the modem (which they should be able to do).
I have no modem.Microwave transmission link exists between the two E1 card of two routers. Four diffrenet routers are showing these type of phenomena . Interesting thing is that the trouble is corrected by itself after some time.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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