Table 56: Option 82 Information - Edge-Core ECS2100-10T Reference Manual

Command Mode
Global Configuration
Command Usage
◆
Option 82 information generated by the switch is based on TR-101 syntax as
shown below:

Table 56: Option 82 information

82 3-69
opt82 opt-len sub-opt1
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
■
access node identifier - ASCII string. Default is the MAC address of the
■
switch's CPU. This field is set by the
command,
eth - The second field is the fixed string "eth"
■
slot - The slot represents the stack unit for this system.
■
port - The port which received the DHCP request. If the packet arrives over
■
a trunk, the value is the ifIndex of the trunk.
vlan - Tag of the VLAN which received the DHCP request.
■
Note that the sub-type and sub-length fields can be enabled or disabled
using the ip dhcp snooping information option
The ip dhcp snooping information option circuit-id command can be
■
used to modify the default settings described above.
◆
The format for TR101 option 82 is: "<IP> eth <SID>/<PORT>[:<VLAN>]". Note
that the SID (Switch ID) is always 0. By default the PVID is added to the end of
the TR101 field for untagged packets. For tagged packets, the VLAN ID is always
added.
E
XAMPLE
This example enables the use of sub-type and sub-length fields for the
circuit-ID (CID) and remote-ID (RID).
Console(config)#no ip dhcp snooping information option encode no-subtype
Console(config)#
Chapter 9
1 1-67 x1
string-len
ip dhcp snooping information option
– 287 –
| General Security Measures
DHCPv4 Snooping
x2 x3 x4 x5
R-124 string
command.
x63