C
HAPTER
24
| General Security Measures
DHCPv6 Snooping
– 909 –
COMMAND USAGE
◆ A trusted interface is an interface that is configured to receive only
messages from within the network. An untrusted interface is an
interface that is configured to receive messages from outside the
network or fire wall.
◆ Set all ports connected to DHCv6 servers within the local network or
fire wall to trusted, and all other ports outside the local network or fire
wall to untrusted.
◆ When DHCPv6 snooping is enabled globally using the ipv6 dhcp
snooping command, and enabled on a VLAN with ipv6 dhcp snooping
vlan command, DHCPv6 packet filtering will be performed on any
untrusted ports within the VLAN according to the default status, or as
specifically configured for an interface with the no ipv6 dhcp
snooping trust command.
◆ When an untrusted port is changed to a trusted port, all the dynamic
DHCPv6 snooping bindings associated with this port are removed.
◆ Additional considerations when the switch itself is a DHCPv6 client –
The port(s) through which it submits a client request to the DHCPv6
server must be configured as trusted.
EXAMPLE
This example sets port 5 to untrusted.
Console(config)#interface ethernet 1/5
Console(config-if)#no ipv6 dhcp snooping trust
Console(config-if)#
RELATED COMMANDS
ipv6 dhcp snooping (903)
ipv6 dhcp snooping vlan (907)
clear ipv6 dhcp
snooping binding
This command clears DHCPv6 snooping binding table entries from RAM.
Use this command without any optional keywords to clear all entries from
the binding table.
SYNTAX
clear ipv6 dhcp snooping binding [mac-address ipv6-address]
mac-address - Specifies a MAC address entry.
(Format: xx-xx-xx-xx-xx-xx)
ipv6-address - Corresponding IPv6 address. This address must be
entered according to RFC 2373 “IPv6 Addressing Architecture,”
using 8 colon-separated 16-bit hexadecimal values. One double
colon may be used in the address to indicate the appropriate
number of zeros required to fill the undefined fields.
To Next Page
Loading...
Need help?
General
