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Table 5 Handling strategies
If a DHCP request
has…
Handling
strategy
DHCP snooping…
Option 82
Drop Drops the message.
Keep Forwards the message without changing Option 82.
Replace
Forwards the message after replacing the original Option 82 with
the Option 82 padded according to the configured padding format,
padding content, and code type.
No Option 82 N/A
Forwards the message after adding the Option 82 padded
according to the configured padding format, padding content, and
code type.
Command and hardware compatibility
Commands and descriptions for centralized devices apply to the following routers:
• MSR1002-4/1003-8S.
• MSR2003.
• MSR2004-24/2004-48.
• MSR3012/3024/3044/3064.
• MSR954(JH296A/JH297A/JH298A/JH299A/JH373A).
• MSR958(JH300A/JH301A).
Commands and descriptions for distributed devices apply to MSR4060 and MSR4080 routers.
DHCP snooping configuration task list
The DHCP snooping configuration does not take effect on a Layer 2 Ethernet interface that is an
aggregation member port. The configuration takes effect when the interface leaves the aggregation
group.
Tasks at a glance
(Required.) Configuring basic DHCP snooping
(Optional.) Configuring Option 82
(Optional.) Configuring DHCP snooping entry auto backup
(Optional.) Enabling DHCP starvation attack protection
(Optional.) Enabling DHCP-REQUEST attack protection
(Optional.) Setting the maximum number of DHCP snooping entries
(Optional.) Configuring DHCP packet rate limit
(Optional.) Configuring a DHCP packet blocking port
(Optional.) Enabling DHCP snooping logging
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