R3303-HP HSR6800 Routers Layer 3 - IP Services Configuration Guide

30
Figure 22 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
(slot number of the receiving port) and 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 23 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 Figure 18.
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