Table 93: Option 82 Information; Ip Dhcp Snooping Information Option Circuit-Id - Edge-Core ES3528MV2 Management Manual

| General Security Measures
C 25
HAPTER
DHCPv4 Snooping
ip dhcp snooping
information option
circuit-id
E
XAMPLE
This example enables DHCP snooping for VLAN 1.
Console(config)#ip dhcp snooping vlan 1
Console(config)#
R C
ELATED OMMANDS
ip dhcp snooping (900)
ip dhcp snooping trust (907)
This command enables the use of DHCP Option 82 information circuit-id
suboption. Use the no form to disable this feature.
S
YNTAX
ip dhcp snooping information option circuit-id string string
no dhcp snooping information option circuit-id
string - An arbitrary string inserted into the circuit identifier field.
(Range: 1-32 characters)
D S
EFAULT ETTING
Disabled
C M
OMMAND ODE
Interface Configuration (Ethernet, Port Channel)
C U
OMMAND SAGE
DHCP provides a relay mechanism for sending information about the
◆
switch and its DHCP clients to the DHCP server. DHCP Option 82 allows
compatible DHCP servers to use the information when assigning IP
addresses, to set other services or policies for clients. For more
information of this process, refer to the Command Usage section under
the ip dhcp snooping information option
Option 82 information generated by the switch is based on TR-101
◆
syntax as shown below:

Table 93: Option 82 information

82 3-69 1
opt82 opt-len sub-opt1 string-len
The circuit identifier used by this switch starts at sub-option1 and goes
to the end of the R-124 string. The R-124 string includes the following
information:
sub-type - Distinguishes different types of circuit IDs.
■
sub-length - Length of the circuit ID type
■
– 906 –
command.
1-67 x1 x2 x3
R-124 string
x4 x5 x63