H3C S5500-EI series Operation Manual page 971

Operation Manual – DHCP
H3C S5500-EI Series Ethernet Switches
Figure 1-7 Sub-option 1 in verbose padding format
Note:
In the above figure, except that the VLAN ID field has a fixed length of 2 bytes, all the
other padding contents of sub-option 1 are length variable.
sub-option 2: Padded with the MAC address of the interface that received the
client's request. It has the same format as that in normal padding format, as shown
in Figure
II. Option 184
Option 184 is a reserved option, and parameters in the option can be defined as
needed. The device supports Option 184 carrying the 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 is a
server serving as the network calling control source and providing program
downloads.
Sub-option 2: IP address of the backup network calling processor that DHCP
clients will contact when the primary one is unreachable.
Sub-option 3: Voice VLAN ID and the result whether DHCP clients take this ID as
the voice VLAN or not.
Sub-option 4: Failover route that specifies the destination IP address and the
called number (SIP users use such IP addresses and numbers to communicate
with each other) that a SIP user uses to reach another SIP user when both the
primary and backup calling processors are unreachable.
Note:
You must define the sub-option 1 to make other sub-options take effect.
1-6.
1-7
Chapter 1 DHCP Overview