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Chapter 26 IP Source Guard
XGS4700-48F User’s Guide
265
• They appear only in the ARP Inspection screens and commands, not in the
MAC Address Filter screens and commands.
26.1.2.2 Trusted vs. Untrusted Ports
Every port is either a trusted port or an untrusted port for ARP inspection. This
setting is independent of the trusted/untrusted setting for DHCP snooping. You
can also specify the maximum rate at which the Switch receives ARP packets on
untrusted ports.
The Switch does not discard ARP packets on trusted ports for any reason.
The Switch discards ARP packets on untrusted ports in the following situations:
• The sender’s information in the ARP packet does not match any of the current
bindings.
• The rate at which ARP packets arrive is too high.
26.1.2.3 Syslog
The Switch can send syslog messages to the specified syslog server (
) when it forwards or discards ARP packets. The Switch can
consolidate log messages and send log messages in batches to make this
mechanism more efficient.
26.1.2.4 Configuring ARP Inspection
Follow these steps to configure ARP inspection on the Switch.
1
Configure DHCP snooping. See
Note: It is recommended you enable DHCP snooping at least one day before you
enable ARP inspection so that the Switch has enough time to build the binding
table.
2
Enable ARP inspection on each VLAN.
3
Configure trusted and untrusted ports, and specify the maximum number of ARP
packets that each port can receive per second.
26.2 IP Source Guard
Use this screen to look at the current bindings for DHCP snooping and ARP
inspection. Bindings are used by DHCP snooping and ARP inspection to distinguish
between authorized and unauthorized packets in the network. The Switch learns
Summary of Contents for XGS4700 Series
Page 2: ......
Page 8: ...Safety Warnings XGS4700 48F User s Guide 8...
Page 24: ...Table of Contents XGS4700 48F User s Guide 24...
Page 25: ...25 PART I User s Guide...
Page 26: ...26...
Page 32: ...Chapter 1 Getting to Know Your Switch XGS4700 48F User s Guide 32...
Page 54: ...Chapter 3 Hardware Overview XGS4700 48F User s Guide 54...
Page 97: ...97 PART II Technical Reference...
Page 98: ...98...
Page 104: ...Chapter 7 System Status and Port Statistics XGS4700 48F User s Guide 104...
Page 118: ...Chapter 8 Basic Setting XGS4700 48F User s Guide 118...
Page 138: ...Chapter 9 VLAN XGS4700 48F User s Guide 138...
Page 142: ...Chapter 10 Static MAC Forward Setup XGS4700 48F User s Guide 142...
Page 174: ...Chapter 14 Bandwidth Control XGS4700 48F User s Guide 174...
Page 188: ...Chapter 17 Link Aggregation XGS4700 48F User s Guide 188...
Page 198: ...Chapter 18 Port Authentication XGS4700 48F User s Guide 198...
Page 216: ...Chapter 21 Policy Rule XGS4700 48F User s Guide 216...
Page 260: ...Chapter 25 AAA XGS4700 48F User s Guide 260...
Page 284: ...Chapter 26 IP Source Guard XGS4700 48F User s Guide 284...
Page 316: ...Chapter 32 Error Disable XGS4700 48F User s Guide 316...
Page 320: ...Chapter 33 Static Route XGS4700 48F User s Guide 320...
Page 328: ...Chapter 35 RIP XGS4700 48F User s Guide 328...
Page 384: ...Chapter 42 ARP Learning XGS4700 48F User s Guide 384...
Page 420: ...Chapter 45 Access Control XGS4700 48F User s Guide 420...
Page 426: ...Chapter 47 Syslog XGS4700 48F User s Guide 426...
Page 434: ...Chapter 48 Cluster Management XGS4700 48F User s Guide 434...
Page 438: ...Chapter 49 MAC Table XGS4700 48F User s Guide 438...
Page 442: ...Chapter 50 IP Table XGS4700 48F User s Guide 442...
Page 446: ...Chapter 52 Routing Table XGS4700 48F User s Guide 446...
Page 454: ...Chapter 54 Troubleshooting XGS4700 48F User s Guide 454...
Page 464: ...Chapter 55 Product Specifications XGS4700 48F User s Guide 464...
Page 473: ...Appendix B Legal Information XGS4700 48F User s Guide 473...
Page 474: ...Appendix B Legal Information XGS4700 48F User s Guide 474...