Chapter 26 IP Source Guard
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You can configure the name and location of the file on the external TFTP server.
The file has the following format:
Figure 119
DHCP Snooping Database File Format
The <initial-checksum> helps distinguish between the bindings in the latest
update and the bindings from previous updates. Each binding consists of 72 bytes,
a space, and another checksum that is used to validate the binding when it is
read. If the calculated checksum is not equal to the checksum in the file, that
binding and all others after it are ignored.
26.1.1.3 DHCP Relay Option 82 Information
The Switch can add information to DHCP requests that it does not discard. This
provides the DHCP server more information about the source of the requests. The
Switch can add the following information:
• Slot ID (1 byte), port ID (1 byte), and source VLAN ID (2 bytes)
• System name (up to 32 bytes)
This information is stored in an Agent Information field in the option 82 field of the
DHCP headers of client DHCP request frames. See
for
more information about DHCP relay option 82.
When the DHCP server responds, the Switch removes the information in the Agent
Information field before forwarding the response to the original source.
You can configure this setting for each source VLAN. This setting is independent of
the DHCP relay settings (
26.1.1.4 Configuring DHCP Snooping
Follow these steps to configure DHCP snooping on the Switch.
1
Enable DHCP snooping on the Switch.
2
Enable DHCP snooping on each VLAN, and configure DHCP relay option 82.
<initial-checksum>
TYPE DHCP-SNOOPING
VERSION 1
BEGIN
<binding-1> <checksum-1>
<binding-2> <checksum-1-2>
...
...
<binding-n> <checksum-1-2-..-n>
END
Содержание XGS-4728F
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Страница 30: ...Chapter 1 Getting to Know Your Switch XGS 4728F User s Guide 30 ...
Страница 34: ...Chapter 2 Hardware Installation and Connection XGS 4728F User s Guide 34 ...
Страница 42: ...Chapter 3 Hardware Overview XGS 4728F User s Guide 42 ...
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Страница 78: ...Chapter 7 System Status and Port Statistics XGS 4728F User s Guide 78 ...
Страница 92: ...Chapter 8 Basic Setting XGS 4728F User s Guide 92 ...
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Страница 114: ...Chapter 9 VLAN XGS 4728F User s Guide 114 ...
Страница 118: ...Chapter 10 Static MAC Forward Setup XGS 4728F User s Guide 118 ...
Страница 148: ...Chapter 14 Bandwidth Control XGS 4728F User s Guide 148 ...
Страница 162: ...Chapter 17 Link Aggregation XGS 4728F User s Guide 162 ...
Страница 186: ...Chapter 21 Policy Rule XGS 4728F User s Guide 186 ...
Страница 230: ...Chapter 25 AAA XGS 4728F User s Guide 230 ...
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Страница 332: ...Chapter 38 Maintenance XGS 4728F User s Guide 332 ...
Страница 358: ...Chapter 41 Syslog XGS 4728F User s Guide 358 ...
Страница 366: ...Chapter 42 Cluster Management XGS 4728F User s Guide 366 ...
Страница 370: ...Chapter 43 MAC Table XGS 4728F User s Guide 370 ...
Страница 374: ...Chapter 44 IP Table XGS 4728F User s Guide 374 ...
Страница 378: ...Chapter 46 Routing Table XGS 4728F User s Guide 378 ...
Страница 381: ...381 PART VI Troubleshooting Product Specifications Troubleshooting 383 Product Specifications 393 ...
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Страница 392: ...Chapter 48 Troubleshooting XGS 4728F User s Guide 392 ...
Страница 402: ...Chapter 49 Product Specifications XGS 4728F User s Guide 402 ...
Страница 403: ...403 PART VII Appendices and Index IP Addresses and Subnetting 409 Legal Information 405 Index 417 ...
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Страница 408: ...Appendix A Legal Information XGS 4728F User s Guide 408 ...