Input Errors and CRC on ASR1002 STM1 Interfaces

[bandararmc]

Hello, 

We are having Input errors and CRC issue with all STM1 interfaces on an ASR1002.  Same router, there are STM4 interfaces too but no errors. 

Please help on this. 

Following are the outputs are configurations on one interface. There is a mpls tunnel configured on this interface too. 

********************************************************************************************

XXXXX#show int po0/2/5
POS0/2/5 is up, line protocol is up
Hardware is SPA-8XOC12-POS
Description: XXXXXXXXXXXXXXXXXXXXXXXXX
Internet address is 41.203.255.201/30
MTU 4470 bytes, BW 155000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 17/255, rxload 132/255
Encapsulation PPP, LCP Open
Open: IPCP, TAGCP, crc 32, loopback not set
Keepalive set (10 sec)
Scramble enabled
Last input 00:00:05, output 00:00:05, output hang never
Last clearing of "show interface" counters 00:07:55
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 80316000 bits/sec, 10247 packets/sec
5 minute output rate 10490000 bits/sec, 6902 packets/sec
4838385 packets input, 4671772477 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
1 runts, 0 giants, 0 throttles
0 parity
515 input errors, 514 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
3308569 packets output, 601824628 bytes, 0 underruns
0 output errors, 0 applique, 0 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions

********************************************************************************************

XXXXXX#show run int po0/2/5
Building configuration...

Current configuration : 320 bytes
!
interface POS0/2/5
description XXXXXXXXXXXXXXXXXXXXXXXXX
ip address x.x.x.x 255.255.255.252
encapsulation ppp
mpls traffic-eng tunnels
crc 32
pos ais-shut
pos framing sdh
pos report lais
pos report lrdi
pos report pais
pos report prdi
pos scramble-atm
ip rsvp bandwidth percent 99
end

********************************************************************************************

XXXXXXX#show run int tunnel103
Building configuration...

Current configuration : 311 bytes
!
interface Tunnel103
description XXXXXXXXXXXXXXXXXXXXXXXXX
ip unnumbered Loopback0
tunnel mode mpls traffic-eng
tunnel destination x.x.x.x
tunnel mpls traffic-eng autoroute announce
tunnel mpls traffic-eng path-option 1 explicit name XXXXXXXXX
tunnel mpls traffic-eng load-share 155520
end

********************************************************************************************

Thank you 

[Georg Pauwen]

Hello,

what is connected on the other side of the STM1s ? CRC and input errors typically indicate some sort of physical problem (cabling etc.), or a configuration mismatch on either end.

[bandararmc]

Hi Georg,

Thank you so much for your reply. 

This is a leased STM1. Physically it is connected to another ISP device. 

Our other end is connected to ASR 1006 STM1. Below is our other end config. Btw no errors on that side.  

*************************************************************************************************************

interface POS0/3/1
description XXXXXXXXXXXXXXXXXXX
ip address x.x.x.x 255.255.255.252
ip flow monitor FLOW-MONITOR-1 input
encapsulation ppp
mpls traffic-eng tunnels
crc 32
pos ais-shut
pos framing sdh
pos report lais
pos report lrdi
pos report pais
pos report prdi
pos scramble-atm
service-policy output IV-QOS
ip rsvp bandwidth percent 99
end

*************************************************************************************************************

XXXXXX#show int po0/3/1
POS0/3/1 is up, line protocol is up
Hardware is SPA-8XOC12-POS
Description: XXXXXXXXXXXXXXXXXXXXX
Internet address is X.X.X.X/30
MTU 4470 bytes, BW 155000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 126/255, rxload 20/255
Encapsulation PPP, LCP Open
Open: IPCP, TAGCP, crc 32, loopback not set
Keepalive set (10 sec)
Scramble enabled
Last input 00:00:01, output 00:00:02, output hang never
Last clearing of "show interface" counters 00:00:26
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 785
Queueing strategy: Class-based queueing
Output queue: 0/40 (size/max)
5 minute input rate 12511000 bits/sec, 7304 packets/sec
5 minute output rate 76631000 bits/sec, 10324 packets/sec
153353 packets input, 27828748 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 parity
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
226481 packets output, 221060311 bytes, 0 underruns
0 output errors, 0 applique, 0 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions

*************************************************************************************************************

Thank you..

[Georg Pauwen · Accepted solution]

Hello,

definitely check with the ISP, at the very least to make sure they don't see any errors on their side as well.

[bandararmc]

Hi Georg,

Thank you very much.

We will check with the provider. 

Best Regards~~~

[Leo Laohoo]

Agree with @Georg Pauwen and this is an ISP issue, however, be prepared to go into a "knife fight" because the ISP will adamantly refuse to troubleshoot until you provide them with "hard" evidence (and the output from the "sh interface" is not one of them). 

A "layer 1" test with the ISP to test the cable is the only "proof" they will accept.  

[bandararmc]

Dear Leo,

Will do. Thank you for your valuable comment.

Best Regards~~~