HPE 5920 series

89
NOTE:
If
sysname
is used as the node identifier, do not include any space when you set the device name.
Otherwise, the DHCP snooping device fails to add or replace the Option 82.
•
user-defined node-identifier: Uses a case-sensitive string of 1 to 50 characters as the node
identifier. The padding format for the specified character string is always ASCII regardless of
the specified padding format.
format: Specifies the padding format for the Circuit ID sub-option.
ascii: Specifies the padding format as ASCII.
hex: Specifies the padding format as hex.
Usage guidelines
The Circuit ID sub-option cannot carry information about interface splitting or subinterfaces. For
more information about interface splitting and subinterfaces, see Interface Configuration Guide.
If you use this command multiple times, the most recent configuration takes effect.
The padding format for the user-defined string, the normal mode, or the verbose modes varies by
command configuration. Table 17 shows how the padding format is determined for different modes.
Table 17 Padding format for different modes
Keyword (mode)
If no padding format
is specified
If the padding
format is ascii
If the padding format is hex
string
circuit-id
You cannot specify a
padding format, and the
padding format is
always ASCII.
N/A N/A
normal
Hex. ASCII. Hex.
verbose
Hex for the VLAN ID.
ASCII for the node
identifier, Ethernet type,
and interface number.
ASCII.
ASCII for the node identifier and
Ethernet type.
Hex for the interface number and
VLAN ID.
If replace is configured as the handling strategy for DHCP requests that contain Option 82, you must
specify the padding mode and padding format for the Circuit ID sub-option. If the handling strategy is
keep or drop, you do not need to specify the padding mode and padding format for the Circuit ID
sub-option.
Examples
# Configure verbose as the padding mode, device name as the node identifier, and ASCII as the
padding format for the Circuit ID sub-option.
<Sysname> system-view
[Sysname] interface Ten-GigabitEthernet 1/0/1
[Sysname-Ten-GigabitEthernet1/0/1] dhcp snooping information enable
[Sysname-Ten-GigabitEthernet1/0/1] dhcp snooping information strategy replace
[Sysname-Ten-GigabitEthernet1/0/1] dhcp snooping information circuit-id verbose
node-identifier sysname format ascii
Related commands
dhcp snooping information enable
dhcp snooping information strategy
display dhcp snooping information