Outer Ethernet Classification

Napatech Link-Capture™ Software Features
Platform
Napatech SmartNIC
Content Type
Feature Description
Capture Software Version
Link™ Capture Software 12.15

Ethernet frames

Outer Ethernet frames (layer 2 frames) are classified in the basic classes shown in this table.

Table. Classification conditions of layer 2 frames
Class Classification Conditions Length of L2 Classification Data (in bytes)
EtherII The frame decoder recognizes an EtherII frame if both of these conditions are met:
  • The value of the MAC Length/Type field is larger than or equal to 1536 (0x0600).
  • The frame is not a PPPoE (point-to-point protocol over Ethernet) frame.
 2
Novell_RAW The frame decoder recognizes a Novell_RAW frame if both of these conditions are met:
  • The value of the MAC Length/Type field is smaller than or equal to 1500 (0x05DC).
  • The MAC header is followed by an LLC header indicating a raw frame (DSAP=0xFF and SSAP=0xFF).
 4
SNAP The frame decoder recognizes a SNAP frame if both of these conditions are met:
  • The value of the MAC Length/Type field is smaller than or equal to 1500 (0x05DC).
  • The MAC header is followed by SNAP headers (DSAP=0xAA or 0xAB, SSAP=0xAA or 0xAB, and Control=0x03, OUI=0x000000, EtherType=<16-bit>).
 10
LLC The frame decoder assumes an LLC frame (the MAC header is assumed to be followed by a 3-byte LLC header) if the value of the MAC Length/Type field is smaller than or equal to 1500 (0x05DC), and none of the above applies. 5
PPPoE Discovery The frame decoder recognizes a PPPoE Discovery frame if both of these conditions are met:
  • The value of the EtherType field is equal to 0x8863.
  • The value of the Ver field is equal to 1.
  • The value of the Type field is equal to 1.
  
PPPoE Session The frame decoder recognizes a PPPoE Session frame if both of these conditions are met:
  • The value of the EtherType field is equal to 0x8864.
  • The value of the Ver field is equal to 1.
  • The value of the Type field is equal to 1.
  
Other The frame decoder recognizes an Other packet if none of the above applies.