Protocols And Standards - HP 6125G Configuration Manual

Figure 26 Sub-option 9 in private padding format
• Standard padding format
Sub-option 1—Contains the VLAN ID of the interface that received the client's request, module
(subcard number of the receiving port) and port (port number of the receiving port). The value
of the sub-option type is 1, and the value of the circuit ID type is 0.
Figure 27 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. It has the same format as that in normal padding format. See
Option 184
Option 184 is a reserved option, and parameters in the option can be defined as needed. The device
supports Option 184 carrying voice related parameters, so a DHCP client with voice functions can get an
IP address along with specified voice parameters from the DHCP server.
Option 184 involves the following sub-options:
Sub-option 1—IP address of the primary network calling processor, which serves as the network
•
calling control source and provides program downloads.
Sub-option 2—IP address of the backup network calling processor. DHCP clients contact the
•
backup when the primary is unreachable.
• Sub-option 3—Voice VLAN ID and the result whether or not DHCP clients take this ID as the voice
VLAN.
Sub-option 4—Failover route that specifies the destination IP address and the called number. A
•
Session Initiation Protocol (SIP) user uses this IP address and number to reach another SIP user when
both the primary and backup calling processors are unreachable.
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
•
32
Figure 22.