12-22-2014 09:52 AM - edited 03-05-2019 12:26 AM
Hello
I have the following issue, CRC errors increasing at the ATM interface level but not AAL5 CRC errors at the pvc level, how come?
Hardware is PID: HWIC-2SHDSL
#sh int ATM0/0/0.2
ATM0/0/0.2 is up, line protocol is up
Hardware is DSLSAR, address is 4c00.824e.fbe8 (bia 4c00.824e.fbe8)
Description: Enlace De Datos
Internet address is 172.15.37.182/30
MTU 4470 bytes, BW 2048 Kbit/sec, DLY 110 usec,
reliability 255/255, txload 5/255, rxload 44/255
Encapsulation ATM
Keepalive not supported
2817967 packets input, 2180607949 bytes
2360382 packets output, 515215928 bytes
0 OAM cells input, 0 OAM cells output
AAL5 CRC errors : 0
AAL5 SAR Timeouts : 0
AAL5 Oversized SDUs : 0
Last clearing of "show interface" counters 1d17h
sh int ATM0/0/0
ATM0/0/0 is up, line protocol is up
Hardware is DSLSAR, address is 4c00.824e.fbe8 (bia 4c00.824e.fbe8)
MTU 4470 bytes, sub MTU 4470, BW 2048 Kbit/sec, DLY 110 usec,
reliability 255/255, txload 4/255, rxload 43/255
Encapsulation ATM, loopback not set
Keepalive not supported
Encapsulation(s): AAL5
8 maximum active VCs, 256 VCs per VP, 1 current VCCs
VC Auto Creation Disabled.
VC idle disconnect time: 300 seconds
Last input 00:00:00, output never, output hang never
Last clearing of "show interface" counters 1d17h
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 33
Queueing strategy: Per VC Queueing
5 minute input rate 350000 bits/sec, 36 packets/sec
5 minute output rate 39000 bits/sec, 27 packets/sec
2818537 packets input, 2181029545 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 5129 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
2360828 packets output, 515273375 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
12-22-2014 02:43 PM
Interface-level error is the PHYSICAL level and the other is a logical segmentation of the physical interface.
If CRC is incrementing at that rate, then contact the ISP and get them to run a Bit Error Rate test (BER).
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