ISO 9542
Connectionless-Mode End System to Intermediate System Protocol
RD-ES (Redirect to an End System) Address Part
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CLNS ES-IS uses different PDU type with this structure:
1. A fixed part, used by all PDU types;
2. a variable address part (depends on PDU type);
3. an options part (optional; depends on PDU type).
Destination Address Length (1 byte)
Protocol: ISO 9542 / CLNS ES-IS
PDU Part: RD-ES (Redirect to an End System) Address Part
Field: destination address length
Length: 1 byte
Contents: length of the following destination address.
Since ISO addresses vary in length, the current length must be indicated.
Destination Address (n bytes)
Protocol: ISO 9542 / CLNS ES-IS
PDU Part: RD-ES (Redirect to an End System) Address Part
Field: destination address
Length: n bytes
Contents: destination address.
Since ISO addresses vary in length, the current length must be indicated within the previous 'destination address length' field.
Subnetwork Address Length (1 byte)
Protocol: ISO 9542 / CLNS ES-IS
PDU Part: RD-ES (Redirect to an End System) Address Part
Field: subnetwork address length
Length: 1 byte
Contents: length of the following subnetwork address.
Since ISO addresses vary in length, the current length must be indicated.
Subnetwork Address (n bytes)
Protocol: ISO 9542 / CLNS ES-IS
PDU Part: RD-ES (Redirect to an End System) Address Part
Field: subnetwork address
Length: n bytes
Contents: subnetwork address.
Since ISO addresses vary in length, the current length must be indicated within the previous 'subnetwork address length' field.
Network-Entity Title Length (1 byte)
Protocol: ISO 9542 / CLNS ES-IS
PDU Part: RD-ES (Redirect to an End System) Address Part
Field: network-entity title length
Length: 1 byte
Contents: always set to 0 by RD-ES (dummy entry).