Namespace inet

Ieee8022SnapHeader

class

This chunk represents an IEEE 802.2 LLC header SNAP extension as defined by the section 9.5 SNAP of the IEEE Std 802-2014, IEEE Standard for Local and Metropolitan Area Networks: Overview and Architecture.

0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-----------------------------------------------+---------------+ | OUI | PROTOCOLID | +---------------+-------------------------------+---------------+ | PROTOCOLID | +---------------+

Extends

Name	Type	Description
FieldsChunk	(unknown -- not in documented files)

Fields

Name	Type	Description
chunkLength
oui	int	organizationally unique identifier (OUI); 0 for protocols that have an EtherType (ARP, IPv4, IPv6, etc.), 3 bytes
protocolId	int	protocol identifier (PID); stores EtherType if orgCode is 0, 2 bytes

Source code

//
// This chunk represents an IEEE 802.2 LLC header SNAP extension as defined by
// the section 9.5 SNAP of the IEEE Std 802-2014, IEEE Standard for Local and
// Metropolitan Area Networks: Overview and Architecture.
//
//  0                   1                   2                   3
//  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
// +-----------------------------------------------+---------------+
// |                      OUI                      |   PROTOCOLID  |
// +---------------+-------------------------------+---------------+
// |   PROTOCOLID  |
// +---------------+
//
class Ieee8022SnapHeader extends FieldsChunk
{
    chunkLength = B(5);
    int oui = -1;   // organizationally unique identifier (OUI); 0 for protocols that have an EtherType (ARP, IPv4, IPv6, etc.), 3 bytes
    int protocolId = -1; // protocol identifier (PID); stores ~EtherType if orgCode is 0, 2 bytes
}

File: src/inet/linklayer/ieee8022/Ieee8022SnapHeader.msg