IP address and lease time—that is, the time, in seconds, remaining before the lease
expires.
If the DHCP server had been configured as untrusted, no entries would be added to the
DHCP snooping database and nothing would be shown in the output of the
show dhcp
snooping binding
command.
Related
Documentation
Enabling a Trusted DHCP Server (CLI Procedure) on page 2912
•
•
Enabling a Trusted DHCP Server (J-Web Procedure) on page 2912
•
Example: Configuring Port Security, with DHCP Snooping, DAI, MAC Limiting, and MAC
Move Limiting, on an EX Series Switch on page 2849
•
Example: Configuring a DHCP Server Interface as Untrusted to Protect the Switch from
Rogue DHCP Server Attacks on page 2859
•
Monitoring Port Security on page 2933
•
Troubleshooting Port Security on page 2945
Verifying That DAI Is Working Correctly
Purpose
Verify that dynamic ARP inspection (DAI) is working on the switch.
Action
Send some ARP requests from network devices connected to the switch.
Display the DAI information:
user@switch>
show arp inspection statistics
ARP inspection statistics:
Interface Packets received ARP inspection pass ARP inspection failed
--------------- --------------- -------------------- ---------------------
ge-0/0/1.0 7 5 2
ge-0/0/2.0 10 10 0
ge-0/0/3.0 12 12 0
Meaning
The sample output shows the number of ARP packets received and inspected per
interface, with a listing of how many packets passed and how many failed the inspection
on each interface. The switch compares the ARP requests and replies against the entries
in the DHCP snooping database. If a MAC address or IP address in the ARP packet does
not match a valid entry in the database, the packet is dropped.
Related
Documentation
Enabling Dynamic ARP Inspection (CLI Procedure) on page 2913
•
•
Enabling Dynamic ARP Inspection (J-Web Procedure) on page 2914
•
Example: Configuring Port Security, with DHCP Snooping, DAI, MAC Limiting, and MAC
Move Limiting, on an EX Series Switch on page 2849
•
Example: Configuring DHCP Snooping, DAI , and MAC Limiting on an EX Series Switch
with Access to a DHCP Server Through a Second Switch on page 2873
•
Example: Configuring DHCP Snooping and DAI to Protect the Switch from ARP Spoofing
Attacks on page 2866
Copyright © 2010, Juniper Networks, Inc.
2936
Complete Software Guide for Junos
®
OS for EX Series Ethernet Switches, Release 10.3
Summary of Contents for JUNOS OS 10.3 - SOFTWARE
Page 325: ...CHAPTER 17 Operational Mode Commands for System Setup 229 Copyright 2010 Juniper Networks Inc ...
Page 1323: ...CHAPTER 56 Operational Mode Commands for Interfaces 1227 Copyright 2010 Juniper Networks Inc ...
Page 2841: ...CHAPTER 86 Operational Commands for 802 1X 2745 Copyright 2010 Juniper Networks Inc ...
Page 3367: ...CHAPTER 113 Operational Mode Commands for CoS 3271 Copyright 2010 Juniper Networks Inc ...
Page 3435: ...CHAPTER 120 Operational Mode Commands for PoE 3339 Copyright 2010 Juniper Networks Inc ...
Page 3529: ...CHAPTER 126 Operational Mode Commands for MPLS 3433 Copyright 2010 Juniper Networks Inc ...