Local Retransmission with Embedded Time Stamp

Feature Set N-ANL11

product_line_custom
Intel® PAC
Napatech SmartNIC
category
Feature Description

Local retransmission with embedded time stamp appends a high-precision time stamp from the capture port to retransmitted frames.

Purpose

By delivering a high-precision time stamp to downlink appliances, local retransmission with embedded time stamp minimizes the need for expensive load distribution switch ports.

Features

The retransmitted frames are expanded to include a trailer with a time stamp, and a new FCS is calculated and added. The Unix-based time stamp format has a resolution of 1 ns and represents time as a 64-bit unsigned integer value, starting from January 1, 1970.


Local retransmission with time stamp

Limitations

Frames are expanded by 12 bytes, increasing the risk of oversubscription of the TX port and resulting packet loss.

Otherwise, limitations for local retransmission with embedded time stamp are similar to the limitations for local retransmission without embedded time stamp (see Local Retransmission).

Configuration interface

Local retransmission with time stamp is configured using NTPL.

Example

In this NTPL example, all traffic received on port 0 is retransmitted with embedded time stamp on port 1.

Assign[DestinationPort=1; TxMetaData=TimeStamp] = Port==0