C
ONFIGURING
THE
S
WITCH
3-246
Figure 3-108. MVR Group Member Configuration
CLI – This example statically assigns a multicast group to a receiver port.
DHCP Snooping
DHCP snooping allows a switch to protect a network from rogue DHCP
servers or other devices which send port-related information to a DHCP
server. This information can be useful in tracking an IP address back to a
physical port.
Network traffic may be disrupted when malicious DHCP messages are
received from an outside source. DHCP snooping is used to filter DHCP
messages received on a non-secure interface from outside the network or
firewall. When DHCP snooping is enabled globally and enabled on a
VLAN interface, DHCP messages received on an untrusted interface from
a device not listed in the DHCP snooping table will be dropped.
When enabled, DHCP messages entering an untrusted interface are
filtered based upon dynamic entries learned via DHCP snooping.
Console(config)#interface ethernet 1/2
Console(config-if)#mvr group 228.1.23.1 4-284
Console(config-if)#
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