HDLC Messages

bktkruppw · ‎01-01-2011

We just started having issues with one of our T1's. We are getting the following error messages doing a debug service-module and debug serial interface:

Jan 1 22:46:03.456: Serial0/0/0: HDLC myseq 109, mineseen 106, yourseen 95, line down
Jan 1 16:46:04: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0, changed state to down
Jan 1 16:46:04: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor 192.168.200.30 (Serial0/0/0) is down: interface down

Also getting theses errors:

Jan 1 22:44:48.142: Serial0/0/0 - Keepalive time mismatch - should be 10 secs, is 29

The keep alive is set to 10seconds.

Any ideas?

paolo bevilacqua · ‎01-01-2011

Please include "show interface serial X/Y/Z" taken on both sides of the circuits.

bktkruppw · ‎01-01-2011

Serial0/0/0 is up, line protocol is up
Hardware is GT96K with integrated T1 CSU/DSU
Description: T1 to Nelson 41.HCGS.100022.KEND
Internet address is 192.168.200.29/30
MTU 1500 bytes, BW 1536 Kbit/sec, DLY 20000 usec,
     reliability 168/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:01, output 00:00:02, output hang never
Last clearing of "show interface" counters 02:00:29
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations 0/2/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1152 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
     10090 packets input, 783348 bytes, 0 no buffer
     Received 380 broadcasts, 0 runts, 0 giants, 0 throttles
     6628 input errors, 6628 CRC, 1155 frame, 1087 overrun, 0 ignored, 1045 abort
     11892 packets output, 961150 bytes, 0 underruns
     0 output errors, 0 collisions, 76 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
     20 carrier transitions
     DCD=up DSR=up DTR=up RTS=up CTS=up

Serial0/0/0 is up, line protocol is up
Hardware is GT96K with integrated T1 CSU/DSU
Internet address is 192.168.200.30/30
MTU 1500 bytes, BW 1536 Kbit/sec, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
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: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations 0/2/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1152 kilobits/sec
5 minute input rate 1000 bits/sec, 2 packets/sec
5 minute output rate 2000 bits/sec, 3 packets/sec
     21855 packets input, 1818527 bytes, 0 no buffer
     Received 1441 broadcasts, 2 runts, 1 giants, 0 throttles
     624 input errors, 623 CRC, 191 frame, 112 overrun, 0 ignored, 225 abort
     22931 packets output, 1783532 bytes, 0 underruns
     0 output errors, 0 collisions, 30 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
     17 carrier transitions
     DCD=up DSR=up DTR=up RTS=up CTS=up

paolo bevilacqua · ‎01-01-2011

The circuit is having so many errors that can't be reliable.

   10090 packets input, 783348 bytes, 0 no buffer
     Received 380 broadcasts, 0 runts, 0 giants, 0 throttles
     6628 input errors, 6628 CRC, 1155 frame, 1087 overrun, 0 ignored, 1045 abort

Is telco providing clock ?

If they are not, are you providing clock on one side only ?

The other obvious chance is, faulty circuit.