SPA-3XOC3-ATM-V2 on ASR9k with XR 5.3.4

[evan.r.moore]

I'm surprised at how many knobs I don't see for configuring the ATM interface on my 9k.  Perhaps this bodes ill for my effort.

I am not getting ILMI to come-up, and odd errors related to AAL5 padding length.  Here are some outputs:

show atm int atm0/2/1/2
Thu Dec 1 16:36:29.343 UTC

Interface : ATM0/2/1/2
AAL Enabled : AAL5
IF-Side : USER
IF-Type : UNI PVC-only
UNI-Type : Private UNI (User-side)
UNI-Version : UNI PVC-only

Max-VP : 255
Max-VC : 4095
Configured L2 PVPs : 0
Configured L2 PVCs : 0
Configured L3 VP-Tunnels : 0
Configured L3 PVCs : 2
L2 PVPs in Down State : 0
L2 PVCs in Down State : 0
L3 VP-Tunnels in Down State : 0
L3 PVCs in Down State : 1
Cell packing count : 0

Received Side Statistics:
Received Cells : 0
Received Bytes : 0
Received AAL Packets : 0

Receive Side Cells Dropped:
Unrecognized VPI/VCI : 269552

Receive Side AAL5 Packets Dropped:
Unavailable SAR Buffer : 0
Non-Resource Exhaustion : 0
Reassembly Timeout : 0
Zero Length : 0
Unavailable Host Buffer : 0
Packet size exceeds MPS : 0
AAL5 Trailer Length Errors : 166467
CRC32/CRC10 errors : 0

Transmit Side Statistics:
Transmitted Cells : 213900
Transmitted Bytes : 10178850
Transmitted AAL Packets : 207920

Transmit Side Cells Dropped:
Unrecognized VPI/VCI : 0

Transmit Side AAL5 Packets Dropped:
Unavailable SAR Buffer : 0
Non-Resource Exhaustion : 0
WRED Threshold : 0
WRED Random : 0

show atm ilmi-status
Thu Dec 1 16:37:35.519 UTC

Interface : ATM0/2/1/2 Interface Type : Private UNI (User-side)
ILMI VCC : (0, 16)
ILMI Keepalive : Enabled (Act 5 Sec, Inact 1 Sec, 4 Retries)
ILMI State : WaitDevType

Does this look familiar to anyone?  I'm not having much luck.  Any advice appreciated.

ERM

[vgunjepa]

Hi Evan,

In the logs, we could see that Receive side cells dropped for Unrecognized VPI/VCI and also AAL5 Trailer Length Errors (packets received from the remote end that were dropped because their packet length was bigger than the AAL5 trailer).

Here, WaitDevType — denotes ILMI process is initialized and in the process of sending ILMI packets to a neighbor.

In this case, the ILMI PVC is not yet established.

We suspect that there is some misconfiguration.

Could you open a TAC SR for this and also share the topology and configs of both routers, so that we can work on this.

Thanks,

Vinod

[evan.r.moore]

Opened SR 681397956.  Configurations attached to the case, and also attached here.

This is a lab setup, with the ASR and an MSR8510 as the ATM switch.

[xthuijs]

say even, do you really need ILMI? to be honest we dont test for that heavily anymore. VC state is possibly better evaluated with faster protos like bfd for instance at L3.

ILMI auto config of circuits is sort of moot, as we dont do svc's for that matter.

I'd probably want to recommend to omit ILMI from the config...

xander

[evan.r.moore]

No, I don't really need ILMI.  It was just a first-attempt to see if anything was going to work.

Problem was isolated to bad hardware on the ATM switch.

ERM