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R2511-HP MSR Router Series Layer 3 - IP Services Configuration Guide(V5)

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Figure 20 Sub-option 9 in private padding format
• Standard padding format:
{ Sub-option 1—Includes the VLAN ID of the interface that received the client's request, module
(subcard number of the receiving port on a centralized device or slot number of the receiving
port on a distributed device) 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 21 Sub-option 1 in standard padding format
{ Sub-option 2—Includes 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 16.
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