Configuring Mff; Overview - HP FlexNetwork 10500 Series Security Configuration Manual

Configuring MFF

Overview

MAC-forced forwarding (MFF) implements Layer 2 isolation and Layer 3 communication between
hosts in the same broadcast domain.
An MFF-enabled device intercepts ARP requests and returns the MAC address of a gateway (or
server) to the senders. In this way, the senders are forced to send packets to the gateway for traffic
monitoring and attack prevention.
NOTE:
MFF does not support VRRPE for a gateway.
As shown in
called Ethernet access nodes (EANs). The MFF-enabled EANs forward packets from hosts to the
gateway for further forwarding. The hosts are isolated at Layer 2, but they can communicate at Layer
3.
An MFF-enabled device and a host cannot ping each other.
Figure 147 Network diagram for MFF
MFF works with any of the following features to implement traffic filtering and Layer 2 isolation on the
EANs:
•
DHCP snooping (see Layer 3—IP Services Configuration Guide).
•
ARP snooping (see Layer 3—IP Services Configuration Guide).
•
IP source guard (see
•
ARP detection (see
•
VLAN mapping (see Layer 2—LAN Switching Configuration Guide).
NOTE:
When MFF works with static IP source guard entries, you must configure VLAN IDs in the static
entries. Otherwise, IP packets allowed by IP source guard are permitted even if their destination
MAC addresses are not the MAC address of the gateway.
Figure 147, hosts are connected to Switch C through Switch A and Switch B, which are
"Configuring IP source
"Configuring ARP attack
guard).
protection").
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