RFC 2701 (rfc2701) - Page 3 of 9
Nortel Networks Multi-link Multi-node PPP Bundle Discovery Protocol
Alternative Format: Original Text Document
RFC 2701 MMP September 1999
2.1 Packet Format
See "IANA Considerations" (section 6) for UDP port number assignment.
A Discovery Message has the following format:
+------+------+------------+------+----======----+
| type |length| random ID | hash | endpoint ID |
+------+------+------------+------+----======----+
where:
type - 2 octets
Message type: 1-query, 2-response.
length - 2 octets
The length (in octets) of the endpoint ID.
Random ID - 4 octets
A random identifier generated by the RAS used to resolve
contention. See "Contention Handling" (section 2.4) for the use
of this field.
hash - 2 octets
The unsigned sum (modulo 2^16) of the unsigned octets of the
Endpoint ID. A value of zero indicates that no hash has been
generated. See "Endpoint Identifier Matching" (section 2.2) for
the use of this field.
endpoint ID - variable length
The endpoint identifier of the connection. From the discovery
protocol's point of view, this is an opaque value. However, to
ensure multi-vendor interoperability, the format of this field
must be defined. The descriptions of, and legal values for, the
fields in the endpoint ID are defined in [MP].
Malkin Informational