630
C
HAPTER
59: DHCP S
NOOPING
C
ONFIGURATION
Configuring the storage format of Option 82
The Switch 7750 supports the HEX or ASCII format for the Option 82 field.
n
The
dhcp-snooping information format
command applies only to the default
content of the Option 82 field. If you have configured the circuit ID or remote ID
sub-option, the format of the sub-option is ASCII, instead of the one specified
with the
dhcp-snooping information format
command.
Configuring the circuit ID sub-option
n
■
If you have configured a circuit ID with the
vlan
vlan-id argument specified,
and the other one without the argument in Ethernet port view, the former
circuit ID applies to the DHCP messages from the specified VLAN; while the
latter one applies to DHCP messages from other VLANs.
■
In a port aggregation group, you can use this command to configure the
primary and member ports respectively. When Option 82 is added, however,
the circuit ID sub-option is subject to the one configured on the primary port.
■
The circuit ID sub-option configured on a port will neither be synchronized in
the case of port aggregation.
Configuring the remote ID sub-option
You can configure the remote ID sub-option in system view or Ethernet port view:
■
In system view, the remote ID takes effect on all interfaces. You can configure
Option 82 as the system name of the device or any customized character string
in the ASCII format.
■
In Ethernet port view, the remote ID takes effect only on the current interface.
You can configure Option 82 as any customized character string in the ASCII
format for different VLANs. That is to say, you can add different configuration
rules for packets from different VLANs.
Table 501
Configure a storage format for the Option 82 field
Operation Command Description
Enter system view
system-view
-
Configure a storage format
for the Option 82 field
dhcp-snooping information
format
{
hex | ascii
}
Optional
By default, the format is
hex
.
Table 502
Configure the circuit ID sub-option
Operation Command Description
Enter system view
system-view
-
Enter Ethernet port view
interface
interface-type
interface-number
-
Configure the circuit ID
sub-option in Option 82
dhcp-snooping information
[
vlan
vlan-id
]
circuit-id
string
string
Optional
By default, the circuit ID
sub-option contains the VLAN
ID and port index related to
the port that receives DHCP
request packets from DHCP
clients
Summary of Contents for Switch 7754
Page 32: ...32 CHAPTER 1 CLI OVERVIEW ...
Page 70: ...70 CHAPTER 5 LOGGING IN USING MODEM ...
Page 76: ...76 CHAPTER 7 LOGGING IN THROUGH NMS ...
Page 86: ...86 CHAPTER 9 CONFIGURATION FILE MANAGEMENT ...
Page 120: ...120 CHAPTER 13 ISOLATE USER VLAN CONFIGURATION ...
Page 126: ...126 CHAPTER 14 SUPER VLAN ...
Page 136: ...136 CHAPTER 16 IP PERFORMANCE CONFIGURATION ...
Page 152: ...152 CHAPTER 17 IPX CONFIGURATION ...
Page 164: ...164 CHAPTER 19 QINQ CONFIGURATION ...
Page 172: ...172 CHAPTER 21 SHARED VLAN CONFIGURATION ...
Page 182: ...182 CHAPTER 22 PORT BASIC CONFIGURATION ...
Page 198: ...198 CHAPTER 24 PORT ISOLATION CONFIGURATION ...
Page 208: ...208 CHAPTER 25 PORT SECURITY CONFIGURATION ...
Page 224: ...224 CHAPTER 27 DLDP CONFIGURATION ...
Page 232: ...232 CHAPTER 28 MAC ADDRESS TABLE MANAGEMENT ...
Page 240: ...240 CHAPTER 29 CENTRALIZED MAC ADDRESS AUTHENTICATION CONFIGURATION ...
Page 280: ...280 CHAPTER 30 MSTP CONFIGURATION ...
Page 348: ...348 CHAPTER 35 IS IS CONFIGURATION ...
Page 408: ...408 CHAPTER 39 802 1X CONFIGURATION ...
Page 412: ...412 CHAPTER 40 HABP CONFIGURATION ...
Page 422: ...422 CHAPTER 41 MULTICAST OVERVIEW ...
Page 426: ...426 CHAPTER 42 GMRP CONFIGURATION ...
Page 480: ...480 CHAPTER 47 PIM CONFIGURATION ...
Page 506: ...506 CHAPTER 48 MSDP CONFIGURATION ...
Page 552: ...552 CHAPTER 51 TRAFFIC ACCOUNTING CONFIGURATION ...
Page 570: ...570 CHAPTER 53 HA CONFIGURATION ...
Page 582: ...582 CHAPTER 54 ARP CONFIGURATION SwitchA arp protective down recover interval 200 ...
Page 622: ...622 CHAPTER 58 DHCP RELAY AGENT CONFIGURATION ...
Page 684: ...684 CHAPTER 61 QOS CONFIGURATION ...
Page 718: ...718 CHAPTER 63 CLUSTER ...
Page 738: ...738 CHAPTER 67 UDP HELPER CONFIGURATION ...
Page 752: ...752 CHAPTER 69 RMON CONFIGURATION ...
Page 772: ...772 CHAPTER 70 NTP CONFIGURATION ...
Page 796: ...796 CHAPTER 72 FILE SYSTEM MANAGEMENT ...
Page 802: ...802 CHAPTER 73 BIMS CONFIGURATION ...
Page 814: ...814 CHAPTER 74 FTP AND TFTP CONFIGURATION ...
Page 830: ...830 CHAPTER 75 INFORMATION CENTER ...
Page 836: ...836 CHAPTER 76 DNS CONFIGURATION ...
Page 852: ...852 CHAPTER 77 BOOTROM AND HOST SOFTWARE LOADING ...
Page 858: ...858 CHAPTER 78 BASIC SYSTEM CONFIGURATION DEBUGGING ...