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L2TP packets drops when packets are higher than 1.480 Bytes

Hi,

we have Cisco NCS5504 100Gig Port link direction AT-Site, but since a week is loosing L2TP packets, when packets are higher than 1.480Bytewhen L2TP packets are send successfully via the ASR9904 , then packets even run also via the NCS5504 - packets arrives with full size 1.500Byte;

we see errors on ASR9904 for this IP on the L2TP Tunnel (20 Bytes are dropped)

 

Jul 31 01:03:17.636 CEST: packet[75]: %PKT_INFRA-PAKSRV-3-BADPAK : Corruption detected in the particle body at b1aa0308 owned by packet 0 belonging to process -1
Jul 31 01:04:12.616 CEST: packet[75]: %PKT_INFRA-PAKSRV-7-BADPTCL_DUMP : corrupted particle body(size:1792): start addr:0xb19a58b0(28 bytes), 001A0001 00000000 45000028 A8644000 3C06C646 0AD80281 34D88DF4
Jul 31 01:05:16.637 CEST: packet[75]: %PKT_INFRA-PAKSRV-7-BADPTCL_DUMP : previous particle body(last 20 bytes) and corrupted particle body(first 8 bytes): start addr:0xb19a585c(28 bytes), 4a503501C 8A1C01B9 FE1350B5 A945A035  (source L2TP) A5AA621A (destination L2TP) ADAFAFF9 78589AB1 
 
following scenario:

AT ASR1001 (FMS1) --> NCS5504 (FMC1) --> ASR9904 (FMC2) --> Sprovider--> GOOSE (Service-Partner) - works
AT ASR1001 (FMS1) --> ASR9904 (FMC2) --> Sprovider--> GOOSE (Service-Partner) - works
AT ASR1001 (FMS1) --> NCS5504 (FMC1) --> Sprovider--> GOOSE (Service-Partner) no go

AT ASR1001 (FMS1) --> ASR9904 (FMC2) --> NCS5504 (FMC1) --> Sprovider--> GOOSE (Service-Partner) no go

 

Sprovider (Nokia 7950 XRS-20, Extended to XRS-40)

Layer2 MTU of Ports are 9.198 Bytes, no drops:

 

here the port stats

Port 1 (a.a.a.a
===============================================================================
Traffic Statistics
===============================================================================
Input Output
-------------------------------------------------------------------------------
Octets 1392057805417924 15975676648409041
Packets 2804579863071 16183733820809
Errors 0 0
Utilization (300 seconds) 3.36% 12.06%

===============================================================================
Ethernet Statistics
===============================================================================

Broadcast Pckts : 5301877086 Drop Events : 0
Multicast Pckts : 10406001106 CRC/Align Errors : 0
Undersize Pckts : 0 Fragments : 0
Oversize Pckts : 0 Jabbers : 0
Collisions : 0

Octets : 17367734453826965
Packets : 18988313683880
Packets of 64 Octets : 831434920157
Packets of 65 to 127 Octets : 3779321250972
Packets of 128 to 255 Octets : 1730355471126
Packets of 256 to 511 Octets : 865132628253
Packets of 512 to 1023 Octets : 1036180112978
Packets of 1024 to 1518 Octets : 6067020760902
Packets of 1519 or more Octets : 4678868539565
===============================================================================

===============================================================================
Port Statistics
===============================================================================
Input Output
-------------------------------------------------------------------------------
Unicast Packets 2804576723875 16168029081813
Multicast Packets 384216 10405616890
Broadcast Packets 2754980 5299122106
Discards 0 0
Unknown Proto Discards 0

Regards

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