2.2.1.1 L2TP AV Pair: Microsoft Vendor-specific Correlation ID Type (0x01)

This option is sent in ICRQ control messages so that any tracing application is able to correlate the messages pertaining to a particular tunnel context on the LAC and LNS.


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M

H

rsvd

Length

Vendor ID

Attribute type

Attribute value (16 bytes)

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...

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M (1 bit): The Mandatory (M) bit. MUST be set to 0.

H (1 bit): The Hidden (H) bit. MUST be set to 0.

rsvd (4 bits): Reserved bits. MUST be set to 0.

Length (10 bits): MUST be set to 22.

Vendor ID (2 bytes): MUST be set to 0x137.

Attribute type (2 bytes): MUST be set to 0x01.

Attribute value (16 bytes): MUST be a 16-byte GUID, as specified in [MS-DTYP] section 2.3.4.2. This SHOULD be unique for every ICRQ request on an LAC/LNS combination.