DELL S50V User Manual
Dynamic Host Configuration Protocol | 327
View the number of entries in the ARP database with the
show arp inspection database
command.
Figure 13-8. Command example:
show arp inspection database
Use
show arp inspection statistics
command to see how many valid and invalid ARP packets have been
processed.
Figure 13-9. Command example:
show arp inspection database
Bypass the ARP Inspection
You can configure a port to skip ARP inspection by defining the interface as trusted, which is useful in
multi-switch environments. ARPs received on trusted ports bypass validation against the binding table. All
ports are untrusted by default.
multi-switch environments. ARPs received on trusted ports bypass validation against the binding table. All
ports are untrusted by default.
Source Address Validation
Using the DHCP binding table, FTOS can perform three types of source address validation (SAV):
•
have been validated against the DHCP binding table.
Task
Command Syntax
Command Mode
Specify an interface as trusted so that ARPs are not
validated against the binding table.
validated against the binding table.
arp inspection-trust
INTERFACE
FTOS Behavior: Introduced in FTOS version 8.2.1.0, Dynamic ARP Inspection (DAI) was available for
Layer 3 only. FTOS version 8.2.1.1 extends DAI to Layer 2.
Layer 3 only. FTOS version 8.2.1.1 extends DAI to Layer 2.
FTOS#
show arp inspection database
Protocol Address Age(min) Hardware Address Interface VLAN CPU
----------------------------------------------------------------------------
Internet 10.1.1.251 - 00:00:4d:57:f2:50 Gi 0/2 Vl 10 CP
Internet 10.1.1.252 - 00:00:4d:57:e6:f6 Gi 0/1 Vl 10 CP
Internet 10.1.1.253 - 00:00:4d:57:f8:e8 Gi 0/3 Vl 10 CP
Internet 10.1.1.254 - 00:00:4d:69:e8:f2 Te 0/50 Vl 10 CP
FTOS#
FTOS#
show arp inspection statistics
Dynamic ARP Inspection (DAI) Statistics
---------------------------------------
Valid ARP Requests : 0
Valid ARP Replies : 1000
Invalid ARP Requests : 1000
Invalid ARP Replies : 0
FTOS#