LI Encapsulation

Qumran-MX (BCM) supports LI with 32 bits shim header: SHIMoUDPoIPoETH

Packet Format Encoding

li packet format encoding
Figure 1. Packet Format Encoding

Payload Direction

Value Payload Direction

0

Reserved for keepalive mechanism

2

Intercepted data or event was sent to target (downstream)

3

Intercepted data or event was sent from target (upstream)

Mapping Payload Format

Value Payload Format

0-3

Reserved (unused)

4

Unknown, Not able to decide the PT

5

IPv4 packet (not used)

6

IPv6 packet (not used)

7

Ethernet Frame (used for Lawful Interception)

Sub-payload Format (Type)

The sub-payload formats are:

  1. Single VLAN tag

  2. Double VLAN tag

  3. Untagged