HPE FlexNetwork MSR Series Comware 7 Layer 3 - Ip Services Configuration Guides

95
Configuring Option 82
The following matrix shows the feature and hardware compatibility:
Hardware Option 82 compatibility
MSR954(JH296A/JH297A/JH298A/JH299A/JH373A) No
MSR958(JH300A/JH301A) No
MSR1002-4/1003-8S Yes
MSR2003 Yes
MSR2004-24/2004-48 Yes
MSR3012/3024/3044/3064 Yes
MSR4060/4080 Yes
Follow these guidelines when you configure Option 82:
• The Option 82 configuration on a Layer 2 Ethernet interface that has been added to an
aggregation group does not take effect unless the interface leaves the aggregation group.
• To support Option 82, you must configure Option 82 on both the DHCP server and the DHCP
snooping device. For information about configuring Option 82 on the DHCP server, see
"Enabling handling of Option 82."
• If
the handling strategy is replace, configure a padding mode and padding format for Option 82.
If the handling strategy is keep or drop, you do not need to configure any padding mode or
padding format for Option 82. The settings do not take effect even if you configure them.
• If Option 82 contains the device name, the device name must contain no spaces. Otherwise,
DHCP snooping drops the message. You can use the sysname command to specify the device
name. For more information about this command, see Fundamentals Command Reference.
• DHCP snooping uses "outer VLAN tag.inner VLAN tag" to fill the VLAN ID field of sub-option 1
in verbose padding format if either of the following conditions exists:
{ DHCP snooping and QinQ work together.
{ DHCP snooping receives a DHCP packet with two VLAN tags.
For example, if the outer VLAN tag is 10 and the inner VLAN tag is 20, the VLAN ID field is
000a.0014. The hexadecimal digit a represents the outer VLAN tag 10, and the hexadecimal
digit 14 represents the inner VLAN tag 20.
• The device name (sysname) must not include spaces if it is configured as the padding content
for sub-option 1. Otherwise, the DHCP snooping device will fail to add or replace Option 82.
To configure DHCP snooping to support Option 82:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter interface view.
interface
interface-type interface-number N/A
3. Enable DHCP snooping to
support Option 82.
dhcp snooping information enable
By default, DHCP snooping
does not support Option
82.
4. (Optional.) Configure a
handling strategy for DHCP
requests that contain
Option 82.
dhcp snooping information strategy
{
drop
|
keep
|
replace
}
By default, the handling
strategy is
replace
.

HPE FlexNetwork MSR Series Specifications

General

Brand	HPE
Model	FlexNetwork MSR Series
Category	Network Router
Language	English