L2 Extraction Feature

Introduced in ASN 2.5

Overview

ASN previously exported only Layer 3 (L3) and Layer 4 (L4) session attributes. With the introduction of the Layer 2 (L2) Field Extraction feature, ASN now exports Layer 2 attributes, providing enhanced visibility into the underlying network topology and packet forwarding information.

This feature is supported in both Telco and Data Center (DC) modes.

Supported protocols

L2 field extraction supports fields from outer Ethernet headers only. It applies to these protocols and traffic types:

• GTP-U

• VXLAN

• FTTH (PPPoE and IPoE)

• IPv4

• IPv6

• Data Center (DC) traffic

Exported Layer 2 fields

For each ingress and egress packet, ASN extracts these Layer 2 attributes from Ethernet and tunnel headers:

Field	Description
SrcMAC	Source MAC Address
DstMAC	Destination MAC Address
VlanID	VLAN Identifier

Kafka export

ASN exports the extracted Layer 2 fields to the Kafka User Session topic.

Example:

{
    "SrcMAC": "00:50:56:83:42:DE",
    "DstMAC": "7C:21:0E:C2:6B:24",
    "VlanID": 760
}