[c-nsp] AAL5 CRC Errors on Cisco 7505 with Enhanced ATM

[Michael Axelrod]

here is good guide to troubleshooting ATM crc errors:
http://www.cisco.com/en/US/customer/tech/tk39/tk48/technologies_tech_note09186a00800c93ef.shtml

in my experience it could be one of a few things - cells discarded
downstream, transmission errors on the interface or HW issues.

Mike
----- Original Message ----- 
From: "Skeeve Stevens" <skeeve at skeeve.org>
To: <cisco-nsp at puck.nether.net>
Sent: Thursday, December 16, 2004 2:22 PM
Subject: [c-nsp] AAL5 CRC Errors on Cisco 7505 with Enhanced ATM


>
>
>
> Anyone know what would be causing these CRC Errors..   It is happening
> across a dozen or so PVC's.
> Just a hint on what to check, or to look at.
>
> The CRC errors are not being seen on the other end. but they are seeing
> packet loss.
>
> .Skeeve
>
> interface ATM3/1/0.111 point-to-point
>  description xxx
>  bandwidth 4000
>  ip vrf forwarding opsm-syd1
>  ip address 172.16.x.x 255.255.255.252
>  atm route-bridged ip
>  pvc 0/111
>   ubr 4000
>   encapsulation aal5snap
>
>
>
>
> uip-lns02-7505#show interface ATM3/1/0.111
> ATM3/1/0.111 is up, line protocol is up
>   Hardware is cyBus ENHANCED ATM PA
>   Description: xxx
>   Internet address is 172.16.x.x/30
>   MTU 4470 bytes, BW 4000 Kbit, DLY 80 usec,
>      reliability 255/255, txload 3/255, rxload 2/255
>   Encapsulation ATM
>   9614180 packets input, 1431678262 bytes
>   12582110 packets output, 9737425100 bytes
>   0 OAM cells input, 0 OAM cells output
>   AAL5 CRC errors : 33145
>   AAL5 SAR Timeouts : 0
>   AAL5 Oversized SDUs : 1
>   ARP type: ARPA, ARP Timeout 04:00:00
>
>
>
> _______________________________________________________
> Skeeve Stevens, RHCE     Email: skeeve at skeeve.org
> Website: www.skeeve.org  - Telephone: (0414) 753 383
> Address: P.O Box 1035, Epping, NSW, 1710, Australia
>
> eIntellego - skeeve at eintellego.net - www.eintellego.net
> _______________________________________________________
> Si vis pacem, para bellum
>
>
>
>
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