Protocols And Standards - HP 830 Series Configuration Manual

Figure 19 Sub-option 1 in standard padding format
Sub-option 2—Contains the MAC address of the DHCP snooping device that received the
client's request. The value of the sub-option type is 2, and that of the remote ID type is 0. It has
the same format as sub-option 2 in normal padding format. See
Option 184
Option 184 is a reserved option. You can define the parameters in the option as needed. The device
supports Option 184 carrying voice related parameters, so a DHCP client with voice functions can get
voice parameters from the DHCP server.
Option 184 has the following sub-options:
Sub-option 1—Specifies the IP address of the primary network calling processor, which serves as
•
the network calling control source and provides program download services.
• Sub-option 2—Specifies the IP address of the backup network calling processor. DHCP clients
contact the backup processor when the primary one is unreachable.
Sub-option 3—Specifies the voice VLAN ID and the result whether or not the DHCP clients takes this
•
ID as the voice VLAN.
Sub-option 4—Specifies the failover route that includes the IP address and the number of the target
•
user. A Session Initiation Protocol (SIP) user uses this IP address and number to directly establish a
connection to the target SIP user when both the primary and backup calling processors are
unreachable.
For Option 184, you must define sub-option 1 to make other sub-options take effect.

Protocols and standards

• RFC 2131, Dynamic Host Configuration Protocol
RFC 2132, DHCP Options and BOOTP Vendor Extensions
•
RFC 1542, Clarifications and Extensions for the Bootstrap Protocol
•
RFC 3046, DHCP Relay Agent Information Option
•
RFC 3442, The Classless Static Route Option for Dynamic Host Configuration Protocol (DHCP)
•
version 4
19
Figure 14.