ProCurve 6200yl User's Guide Page 418

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11-18
Configuring Advanced Threat Protection
Dynamic ARP Protection
Take into account the following configuration guidelines when you use
dynamic ARP protection in your network:
You should configure ports connected to other switches in the network
as trusted ports. In this way, all network switches can exchange ARP
packets and update their ARP caches with valid information.
Switches that do not support dynamic ARP protection should be sepa-
rated by a router in their own Layer 2 domain. Because ARP packets do
not cross Layer 2 domains, the unprotected switches cannot unknowingly
accept ARP packets from an attacker and forward them to protected
switches through trusted ports.
To configure one or more Ethernet interfaces that handle VLAN traffic as
trusted ports, enter the arp protect trust command at the global configuration
level. The switch does not check ARP requests and responses received on a
trusted port.
An example of the arp protect trust command is shown here:
ProCurve(config)# arp protect trust b1-b4, d1
Adding an IP-to-MAC Binding to the DHCP Database
A routing switch maintains a DHCP binding database, which is used for DHCP
and ARP packet validation. Both the DHCP snooping and DHCP Option 82
insertion features maintain the lease database by learning the IP-to-MAC
bindings on untrusted ports. Each binding consists of the client MAC address,
port number, VLAN identifier, leased IP address, and lease time.
If your network does not use DHCP or if some network devices have fixed,
user-configured IP addresses, you can enter static IP-to-MAC address bindings
in the DHCP binding database. The switch uses manually configured static
bindings for DHCP snooping and dynamic ARP protection.
Syntax: [no] arp protect trust <port-list>
port-list Specifies a port number or a range of port
numbers. Separate individual port numbers or
ranges of port numbers with a comma; for
example: c1-c3, c6.
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