07-25-2003 11:53 AM - edited 03-02-2019 09:08 AM
I have a Cisco 3640 router that host 3 t1 circuits. 1 is to our frame, the other 2 load balance between a remote site. We have been seeing CRC/Framing errors on 1 of 2 circuits going to the remote site and have had the line tested clean. The CSU's are internal so cables are not an issue. From what I've read it sounds most likely to be a clocking issue but the configs look OK. Does anybody have any suggestions?
07-25-2003 11:57 AM
ussually if you have a clocking problem you will see aborts increment , Can you paste in sh int and a sh run from both sides .
Have you given the carrier any loops to try to determine where the problem is ?
07-25-2003 12:50 PM
Had the carrier on site...he could loop both ends. Ran several different test patterns and they tested good.
Appreciate the help.
*****Near side*******
TLC-Gateway#show interfaces ser 3/1
Serial3/1 is up, line protocol is up
Hardware is DSCC4 with integrated T1 CSU/DSU
Internet address is 192.168.236.1/24
MTU 1500 bytes, BW 2048 Kbit, DLY 20000 usec,
reliability 255/255, txload 13/255, rxload 4/255
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 00:05:15
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 0/4/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 1536 kilobits/sec
5 minute input rate 38000 bits/sec, 37 packets/sec
5 minute output rate 110000 bits/sec, 39 packets/sec
11933 packets input, 1921504 bytes, 0 no buffer
Received 37 broadcasts, 0 runts, 0 giants, 0 throttles
111 input errors, 48 CRC, 63 frame, 0 overrun, 0 ignored, 0 abort
12548 packets output, 4341973 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
-------------------------------------------------------
show running config output (had to shorten, got rid of sub interface on the frame)
ip subnet-zero
!
!
no ip domain-lookup
ip domain-name totallogistic.com
ip name-server 192.81.228.2
!
ip address-pool dhcp-proxy-client
isdn switch-type primary-dms100
!
controller T1 1/0
framing esf
linecode b8zs
pri-group timeslots 1-24
!
!
!
interface Loopback0
description Interface for Async (Dialin) Users
ip address 192.168.253.1 255.255.255.0
!
interface Loopback1
description Interface for ISDN (Backup) Users
ip address 192.168.254.1 255.255.255.0
!
interface FastEthernet0/0
ip address 192.81.228.14 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
description Connection to Frame
bandwidth 1544
no ip address
encapsulation frame-relay IETF
service-module t1 timeslots 1-24
frame-relay lmi-type ansi
!
interface Serial0/1
description T1 Connection to Holland
bandwidth 1544
ip address 192.168.236.1 255.255.255.0
no ip route-cache
no ip mroute-cache
shutdown
!
interface Serial1/0:23
no ip address
encapsulation ppp
dialer rotary-group 1
dialer-group 1
isdn switch-type primary-dms100
isdn incoming-voice modem
no cdp enable
ppp authentication chap
ppp multilink
!
interface Serial3/0
description to Holland Office
ip address 192.168.235.1 255.255.255.0
no ip route-cache
no ip mroute-cache
!
interface Serial3/1
ip address 192.168.236.1 255.255.255.0
no ip route-cache
no ip mroute-cache
!
interface Group-Async0
ip unnumbered Loopback0
encapsulation ppp
no ip route-cache
no ip mroute-cache
dialer in-band
dialer idle-timeout 3600
dialer-group 1
async mode dedicated
peer default ip address pool ASYNC
no fair-queue
ppp authentication chap pap
group-range 65 88
!
interface Dialer1
ip unnumbered Loopback1
encapsulation ppp
no ip route-cache
no ip mroute-cache
dialer in-band
dialer idle-timeout 180
dialer-group 1
no peer default ip address
no cdp enable
ppp authentication chap
ppp multilink
!
ip local pool ASYNC 192.168.253.2 192.168.253.254
ip classless
ip route 0.0.0.0 0.0.0.0 192.81.228.47
ip route 192.168.10.0 255.255.255.0 192.168.213.2
ip route 192.168.15.0 255.255.255.0 192.168.233.2
ip route 192.168.20.0 255.255.255.0 192.168.212.2
ip route 192.168.25.0 255.255.255.0 192.168.214.2
ip route 192.168.30.0 255.255.255.0 192.168.235.2
ip route 192.168.30.0 255.255.255.0 192.168.236.2
ip route 192.168.31.0 255.255.255.0 192.168.235.2
ip route 192.168.31.0 255.255.255.0 192.168.236.2
ip route 192.168.35.0 255.255.255.0 192.168.216.2
ip route 192.168.40.0 255.255.255.0 192.168.217.2
ip route 192.168.45.0 255.255.255.0 192.168.218.2
ip route 192.168.50.0 255.255.255.0 192.168.219.2
ip route 192.168.55.0 255.255.255.0 192.168.220.2
ip route 192.168.60.0 255.255.255.0 192.168.221.2
ip route 192.168.65.0 255.255.255.0 192.168.222.2
ip route 192.168.70.0 255.255.255.0 192.168.223.2
ip route 192.168.75.0 255.255.255.0 192.168.224.2
ip route 192.168.80.0 255.255.255.0 192.168.225.2
ip route 192.168.85.0 255.255.255.0 192.168.226.2
ip route 192.168.90.0 255.255.255.0 192.168.227.2
ip route 192.168.95.0 255.255.255.0 192.168.228.2
ip route 192.168.100.0 255.255.255.0 192.168.229.2
ip route 192.168.105.0 255.255.255.0 192.168.230.2
ip route 192.168.105.0 255.255.255.0 192.168.254.2 200
ip route 192.168.110.0 255.255.255.0 192.168.231.2
ip route 192.168.115.0 255.255.255.0 192.168.232.0
ip route 192.168.120.0 255.255.255.0 192.168.234.2
ip route 206.230.208.0 255.255.255.0 192.168.214.2
no ip http server
ip pim bidir-enable
!
logging 192.81.228.100
dialer-list 1 protocol ip permit
xxxxxx
no snmp-server enable traps tty
!
line con 0
password xxxx
login
line 65 88
timeout login response 100
no flush-at-activation
login local
modem Dialin
modem autoconfigure discovery
autoselect ppp
line aux 0
password xxxxx
login
speed
line vty 0 4
password xxxxx
login
!
end
------------------------------------------------------
Gateway#show service-module ser 3/1
Module type is T1/fractional
Hardware revision is 0.88, 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 user loopback performed:
no loopback
duration 00:07:35
Last module self-test (done at startup): Passed
Last clearing of alarm counters 00:08:20
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):
15569 Line Code Violations, 10076 Path Code Violations
1033 Slip Secs, 1043 Fr Loss Secs, 7454 Line Err Secs, 12137 Degraded Mins
6391 Errored Secs, 2577 Bursty Err Secs, 51 Severely Err Secs, 1033 Unavail
Secs
Data in current interval (564 seconds elapsed):
255 Line Code Violations, 183 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 60 Line Err Secs, 9 Degraded Mins
59 Errored Secs, 24 Bursty Err Secs, 1 Severely Err Secs, 0 Unavail Secs
---------------------------------------------------------------------------------
show contr ser 3/1 output
DSCC4 SCC specific errors:
9 input aborts on receiving flag sequence
0 throttles, 0 enables
0 overruns
0 transmitter underruns
0 transmitter CTS losts
0 dma tx err, 9 dma rx err
12 scc frame length exceeded
0 xoffs received
245776097 fecpm intr, 57187074 rx intr, 62081680 tx intr, 0 num holdq
31 rxbd overflow
07-25-2003 12:51 PM
Remote side configuration......
*********REMOTE SIDE**********************************************************
show running config output
ip subnet-zero
!
!
!
!
!
!
interface Serial0
ip address 192.168.235.2 255.255.255.0
no ip directed-broadcast
no ip route-cache
no ip mroute-cache
!
interface Serial1
ip address 192.168.236.2 255.255.255.0
no ip directed-broadcast
no ip route-cache
no ip mroute-cache
!
interface FastEthernet0
ip address 192.168.30.1 255.255.255.0
no ip directed-broadcast
!
ip classless
ip route 0.0.0.0 0.0.0.0 192.168.235.1
ip route 0.0.0.0 0.0.0.0 192.168.236.1
!
logging 192.81.228.100
xxxx
!
line con 0
password xxxx
login
transport input none
line aux 0
password xxxx
login
password xxxxx
login
!
end
--------------------------------------------------------------------------------------------
CDO#show interfaces ser 1
Serial1 is up, line protocol is up
Hardware is PQUICC with Fractional T1 CSU/DSU
Internet address is 192.168.236.2/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliablility 255/255, txload 6/255, rxload 20/255
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 1d08h
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
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)
5 minute input rate 123000 bits/sec, 41 packets/sec
5 minute output rate 37000 bits/sec, 35 packets/sec
3526789 packets input, 2092005274 bytes, 0 no buffer
Received 15717 broadcasts, 0 runts, 0 giants, 0 throttles
980 input errors, 307 CRC, 663 frame, 0 overrun, 0 ignored, 10 abort
3384387 packets output, 558937931 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
2 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
--------------------------------------------------------------------------------------------
CDO#show ser
CDO#show service-module ser 1
Module type is T1/fractional
Hardware revision is 0.96, Software revision is 1.08,
Image checksum is 0xB8C1E847, 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 1d08h
loss of signal : 0,
loss of frame : 0,
AIS alarm : 0,
Remote alarm : 1, last occurred 02:56:54
Module access errors : 0,
Total Data (last 96 15 minute intervals):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 5 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
3 Errored Secs, 0 Bursty Err Secs, 5 Severely Err Secs, 0 Unavail Secs
Data in current interval (206 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
CDO#
--------------------------------------------------------------------------------------------
Show controller ser 1
CC HDLC PARAMETER RAM (at 0xFF003D38)
CRC Preset [C_PRES]=0xFFFF, Mask [C_MASK]=0xF0B8
Errors: CRC [CRCEC]=308, Aborts [ABTSC]=10, Discards [DISFC]=0
Nonmatch Addr Cntr [NMARC]=0
Retry Count [RETRC]=0
Max Frame Length [MFLR]=1608
Rx Int Threshold [RFTHR]=0, Frame Cnt [RFCNT]=47375
User-defined Address 0000/0000/0000/0000
User-defined Address Mask 0x0000
buffer size 1524
PowerQUICC SCC specific errors:
145 input aborts on receiving flag sequence
0 throttles, 0 enables
0 overruns
0 transmitter underruns
0 transmitter CTS losts
07-25-2003 01:37 PM
most of the time in point to point scenarios the carrier does not provide clock , have you verified from the carrier if they are providing clock?
Also is there an extended demarc at either side ?
Another thing you may want to do is have the carrier put up a monitor and monitor the port for a day or 2 then have them pull the port stats , your errors could be bursty and when they test they do not see the errors, more often than not it is a carrier issue ,
also find out where they are testing from
are they testing from the nearest dax if so have them move back as close to eith side then run to loops that you provide ,
If you do not have the service module configured to be able to be lop\oped remotely they will not be able to do it,service-module t1 fdl both is the command , if this is not on there there is no way they could have looped the csu
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