Recently setup a PPP WAN with T1 between 2 1750 routers. I’m watching the line and noticing what I believe to be errors – but being a noob, need help in understanding what I’m seeing. I cleared the counters on both routers today @ 11:30a. These statistics were taken @ 4:15p. Run time of approx 5 hours.
Main router#show interface serial0 Serial0 is up, line protocol is up
Hardware is PQUICC with Fractional T1 CSU/DSU
Description: WAN to Bear Lake
Internet address is 192.168.33.1/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, loopback not set
Keepalive set (10 sec)
LCP Open
Open: IPCP, CDPCP
Last input 00:00:03, output 00:00:00, output hang never
Last clearing of “show interface” counters 04:43:04
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 67
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/12/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 1158 kilobits/sec
5 minute input rate 8000 bits/sec, 22 packets/sec
5 minute output rate 7000 bits/sec, 22 packets/sec
212764 packets input, 18813675 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
9140 input errors, 2569 CRC, 5371 frame, 0 overrun, 0 ignored, 1200 abort
211632 packets output, 27433416 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
2 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
main router#show service-module serial0
Module type is T1/fractional
Hardware revision is 0.96, Software revision is 0.2,
Image checksum is 0x73D70058, Protocol revision is 0.1
Receiver has no alarms.
Framing is ESF, Line Code is B8ZS, Current clock source is line,
Fraction has 24 timeslots (64 Kbits/sec each), Net bandwidth is 1536 Kbits/sec.
Last module self-test (done at startup): Passed
Last clearing of alarm counters 04:44:50
loss of signal : 0,
loss of frame : 0,
AIS alarm : 0,
Remote alarm : 0,
Module access errors : 0,
Total Data (last 96 15 minute intervals):
0 Line Code Violations, 1652 Path Code Violations
0 Slip Secs, 31 Fr Loss Secs, 0 Line Err Secs, 196 Degraded Mins
243 Errored Secs, 230 Bursty Err Secs, 31 Severely Err Secs, 0 Unavail Secs
Data in current interval (118 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
{ 3 comments… read them below or add one }
Due to message length limit, here is the remote router info.
remote router#show interface serial0
Serial0 is up, line protocol is up
Hardware is PQUICC with Fractional T1 CSU/DSU
Description: WAN to Zeeland
Internet address is 192.168.33.2/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, loopback not set
Keepalive set (10 sec)
LCP Open
Open: IPCP, CDPCP
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of “show interface” counters 04:42:59
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 70
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/8/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 1158 kilobits/sec
5 minute input rate 1000 bits/sec, 14 packets/sec
5 minute output rate 1000 bits/sec, 14 packets/sec
211635 packets input, 27433443 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
212962 packets output, 18847262 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
2 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
remote router#show service-module serial0
Module type is T1/fractional
Hardware revision is 0.96, Software revision is 0.2,
Image checksum is 0x73D70058, Protocol revision is 0.1
Receiver has no alarms.
Framing is ESF, Line Code is B8ZS, Current clock source is line,
Fraction has 24 timeslots (64 Kbits/sec each), Net bandwidth is 1536 Kbits/sec.
Last module self-test (done at startup): Passed
Last clearing of alarm counters 04:43:37
loss of signal : 0,
loss of frame : 0,
AIS alarm : 0,
Remote alarm : 1, last occurred 01:41:24
Module access errors : 0,
Total Data (last 96 15 minute intervals):
14999 Line Code Violations, 7 Path Code Violations
0 Slip Secs, 30 Fr Loss Secs, 7007 Line Err Secs, 1373 Degraded Mins
6972 Errored Secs, 0 Bursty Err Secs, 35 Severely Err Secs, 0 Unavail Secs
Data in current interval (412 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
I’m mainly concerned about QoS on this line due to running VoIP between the sites.
Pointers? Guidance? Much appreciated.
Looks like you have a noisy link.
The link explains each counters.
http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_command_reference_chapter09186a00800874c4.html#wp1020497
You definetely have issues. I’d have your telco do intrusive testing on this circuit.
Also, double check with them and make sure the circuit is provisioned as your router is config’d:
- ESF
- B8ZS
- Make sure they are providing clock.
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