Moxa Technologies E Series Instrukcja Użytkownika Pobierz pdf (Strona 71)

Moxa E Series Managed Ethernet Switch Featured Functions

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The Option 82 information contains 2 sub-options, Circuit ID and Remote ID, which define the relationship

between the end device IP and the DHCP Option 82 server. The Circuit ID is a 4-byte number generated by the

Ethernet switch—a combination of physical port number and VLAN ID. The format of the Circuit ID is shown

below:

FF–VV–VV–PP

This is where the first byte “FF” is fixed to “01”, the second and the third byte “VV-VV” is formed by the port

VLAN ID in hex, and the last byte “PP” is formed by the port number in hex. For example:

01–00–0F–03 is the “Circuit ID” of port number 3 with port VLAN ID 15.

The “Remote ID” identifies the relay agent itself and can be one of the following:

1. The IP address of the relay agent.

2. The MAC address of the relay agent.

3. A combination of IP address and MAC address of the relay agent.

4. A user-defined string.

DHCP Relay Agent

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Moxa Technologies E Series Instrukcja Użytkownika Strona 71