Error Filter

The following error filters are supported.

// Frames with code violation errors.
Assign[StreamId = 0] = CvError==TRUE

//Frames with FCS errors.
Assign[StreamId = 1] = CrcError==TRUE

Error filters can be combined as follows.

Assign[StreamId=1] = CvError==TRUE OR CrcError==TRUE

Frames with a length larger than 10,000 bytes are hard-sliced into 10,000 bytes and forwarded with a hard-sliced indication. Truncated frames can be filtered as shown in the following example.

Assign[StreamId=2] = Truncated==True

The following SmartNICs support layer 3 and 4 checksum errors.

• NT200A02 SmartNICs running on a test and measurement image
• NT100A01 SmartNICs running on a test and measurement image
• NT50B01 SmartNICs running on a test and measurement image

Frames with layer 3 and 4 checksum errors can be filtered as follows.

Assign[StreamId = 3] = Layer3CheckSumError==TRUE
Assign[StreamId = 4] = Layer4CheckSumError==TRUE

Frames with layer 3 and 4 checksum errors on the inner layer can be filtered as follows.

Assign[StreamId = 5] = Layer3TunnelCheckSumError==TRUE
Assign[StreamId = 6] = Layer4TunnelCheckSumError==TRUE

For error checks of tunneled traffic, it is possible to validate checksum errors on both inner and outer layers by configuring the CsrxPrioritizeInnerProtocol parameter in the /opt/napatech3/config/ntservice.ini file as follows.

CsrxPrioritizeInnerProtocol = or

If it is set to or, both inner and outer layer 3 and 4 checksum errors will be detected on frames containing an inner layer. See Checksum error indications in DN-1128.