Operation Manual – DHCP
H3C S3610&S5510 Series Ethernet Switches
Chapter 1 DHCP Overview
1-7
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.
z
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
.
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:
z
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.
z
Sub-option 2: IP address of the backup network calling processor that DHCP
clients will contact when the primary one is unreachable.
z
Sub-option 3: Voice VLAN ID and the result whether DHCP clients take this ID as
the voice VLAN or not.
z
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.
