Suboption Components Of Option 82 - Dell PowerConnect J-EX4200-24T Software Manual

Suboption Components of Option 82

Configurations of the J-EX Series Switch That Support Option 82
NOTE: To use the DHCP option 82 feature, you must ensure that the DHCP
server is configured to accept option 82. If it is not configured to accept
option 82, then when it receives requests containing option 82 information,
it does not use the information in setting parameters and it does not echo
the information in its response message. For detailed information about
configuring DHCP services, see the Junos OS System Basics Configuration
Guide at
http://www.juniper.net/techpubs/software/junos/
for DHCP service on the J-EX Series Switch includes the
the [edit system services]
Option 82 as implemented on the J-EX Series switch comprises the suboptions circuit
ID, remote ID, and vendor ID. These suboptions are fields in the packet header:
circuit ID—Identifies the circuit (interface and/or VLAN) on the switch on which the
request was received. The circuit ID contains the interface name and/or VLAN name,
with the two elements separated by a colon—for example,
is the interface name and
ge-0/0/10
received on a Layer 3 interface, the circuit ID is just the interface name—for example,
ge-0/0/10 .
Use the prefix option to add an optional prefix to the circuit ID. If you enable the
option, the hostname for the switch is used as the prefix; for example,
switch1:ge-0/0/10:vlan1
You can also specify that the interface description be used rather than the interface
name and/or that the VLAN ID be used rather than the VLAN name.
remote ID—Identifies the host. By default, the remote ID is the MAC address of the
switch. You can specify that the remote ID be the hostname of the switch, the interface
description, or a character string of your choice. You can also add an optional prefix to
the remote ID.
vendor ID—Identifies the vendor of the host. If you specify the
not enter a value, the default value
character string.
Configurations of the J-EX Series switch that support option 82 are:
Switch and Clients Are on Same VLAN as DHCP Server on page 2561
Switch Acts as Relay Agent on page 2562
Switch and Clients Are on Same VLAN as DHCP Server
If the DHCP clients, the switch, and the DHCP server are all on the same VLAN, the switch
forwards the requests from the clients on untrusted access interfaces to the server on a
trusted interface. See Figure 65 on page 2562.
hierarchy level.
is the VLAN name. If the request packet is
vlan1
, where is the hostname.
switch1
is used. To specify a value, you type a
Juniper
Chapter 93: Port Security Overview
. The configuration
dhcp statement at
, where
ge-0/0/10:vlan1
prefix
option but do
vendor-id
2561