MES-2110 User’s Guide
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IP Source Guard
19.1 Overview
IP source guard uses a binding table to distinguish between authorized and
unauthorized DHCP and ARP frames in your network. A binding contains these key
attributes:
• MAC address
• VLAN ID
• IP address
• Port number
When the MES-2110 receives a DHCP or ARP frame, it looks up the appropriate
MAC address, VLAN ID, IP address, and port number in the binding table. If there
is a binding, the MES-2110 forwards the frame. If there is not a binding, the MES-
2110 discards the frame.
The MES-2110 builds the binding table by snooping DHCP frames (dynamic
bindings) and from information provided manually by administrators (static
bindings).
IP source guard consists of the following features:
• Static bindings. Use this to create static bindings in the binding table.
• DHCP snooping. Use this to filter unauthorized DHCP frames on the network and
to build the binding table dynamically.
• ARP inspection. Use this to filter unauthorized ARP frames on the network.
If you want to use dynamic bindings to filter unauthorized ARP frames (typical
implementation), you have to enable DHCP snooping before you enable ARP
inspection.
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Страница 17: ...Table of Contents MES 2110 User s Guide 17 Index 229 ...
Страница 18: ...Table of Contents MES 2110 User s Guide 18 ...
Страница 50: ...Chapter 4 Tutorials MES 2110 User s Guide 50 ...
Страница 74: ...Chapter 8 Loop Detection MES 2110 User s Guide 74 ...
Страница 76: ...Chapter 9 Jumbo Frame MES 2110 User s Guide 76 ...
Страница 88: ...Chapter 10 802 1x MES 2110 User s Guide 88 ...
Страница 136: ...Chapter 17 IGMP MES 2110 User s Guide 136 ...
Страница 140: ...Chapter 18 DHCP Relay Configuration MES 2110 User s Guide 140 ...
Страница 150: ...Chapter 19 IP Source Guard MES 2110 User s Guide 150 ...
Страница 206: ...Chapter 23 Command Line Interface MES 2110 User s Guide 206 ...
Страница 214: ...Chapter 24 Troubleshooting MES 2110 User s Guide 214 ...
Страница 220: ...Appendix A Changing a Fuse MES 2110 User s Guide 220 ...
Страница 228: ...Appendix C Legal Information MES 2110 User s Guide 228 ...