Brocade FastIron Ethernet Switch Security Configuration Gu Instrukcja Użytkownika Pobierz pdf (Strona 344)

DHCP Option 82 sub-options

The Brocade implementation of DHCP Option 82 supports the following sub-options:

• Sub-Option 1 - Circuit ID

• Sub-Option 2 - Remote ID

• Sub-Option 6 - Subscriber ID

These sub-options are described in the following sections.

Sub-option 1 - circuit id

The Circuit ID (CID) identifies the circuit or port from which a DHCP client request was sent. The

FastIron switch uses this information to relay DHCP responses back to the proper circuit, for example,

the port number on which the DHCP client request packet was received.

Brocade FastIron devices support the General CID packet format. This simple format encodes the CID

type, actual information length, VLAN ID, slot number, and port number. This format is compatible with

the format used by other vendors’ devices. The following figure illustrates the general CID packet

format.

FIGURE 28 General CID packet format

Sub-option 2 - Remote ID

The Remote ID (RID) identifies the remote host end of the circuit (the relay agent). Brocade devices

use the MAC address to identify itself as the relay agent. The following figure illustrates the RID packet

format.

FIGURE 29 RID packet format

Sub-option 6 - subscriber id

The Subscriber ID (SID) is a unique identification number that enables an Internet Service Provider to:

• Identify a subscriber

• Assign specific attributes to that subscriber (for example, host IP address, subnet mask, and

domain name server (DNS))

• Trigger accounting

DHCP Option 82 sub-options

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