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Church Of The
Swimming Elephant

3.1.1 Common Header Connected: An Internet Encyclopedia
3.1.1 Common Header

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Next: 3.1.2 Object Formats

3.1.1 Common Header

3.1.1 Common Header

                0             1              2             3
         | Vers | Flags|  Msg Type   |       RSVP Checksum       |
         |  Send_TTL   | (Reserved)  |        RSVP Length        |

The fields in the common header are as follows:

Vers: 4 bits

Protocol version number. This is version 1.

Flags: 4 bits

0x01-0x08: Reserved

No flag bits are defined yet.

Msg Type: 8 bits

1 = Path

2 = Resv

3 = PathErr

4 = ResvErr

5 = PathTear

6 = ResvTear

7 = ResvConf

RSVP Checksum: 16 bits

The one's complement of the one's complement sum of the message, with the checksum field replaced by zero for the purpose of computing the checksum. An all-zero value means that no checksum was transmitted.

Send_TTL: 8 bits

The IP TTL value with which the message was sent. See Section 3.8.

RSVP Length: 16 bits

The total length of this RSVP message in bytes, including the common header and the variable-length objects that follow.

Next: 3.1.2 Object Formats

Connected: An Internet Encyclopedia
3.1.1 Common Header


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