Cisco 500 Series, Configuration Manual

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Cisco Security Appliance Command Line Configuration Guide
OL-12172-03
Chapter 12 Configuring IPv6
Verifying the IPv6 Configuration
Suppressing Router Advertisement Messages
By default, Router Advertisement messages are automatically sent in response to router solicitation
messages. You may want to disable these messages on any interface for which you do not want the
security appliance to supply the IPv6 prefix (for example, the outside interface).
To suppress IPv6 router advertisement transmissions on an interface, enter the following command:
hostname(config-if)# ipv6 nd suppress-ra
Entering this command causes the security appliance to appear as a regular IPv6 neighbor on the link
and not as an IPv6 router.
Configuring a Static IPv6 Neighbor
You can manually define a neighbor in the IPv6 neighbor cache. If an entry for the specified IPv6 address
already exists in the neighbor discovery cache—learned through the IPv6 neighbor discovery
process—the entry is automatically converted to a static entry. Static entries in the IPv6 neighbor
discovery cache are not modified by the neighbor discovery process.
To configure a static entry in the IPv6 neighbor discovery cache, enter the following command:
hostname(config-if)# ipv6 neighbor ipv6_address if_name mac_address
The ipv6_address argument is the link-local IPv6 address of the neighbor, the if_name argument is the
interface through which the neighbor is available, and the mac_address argument is the MAC address of
the neighbor interface.
Note The clear ipv6 neighbors command does not remove static entries from the IPv6 neighbor discovery
cache; it only clears the dynamic entries.
Verifying the IPv6 Configuration
This section describes how to verify your IPv6 configuration. You can use various show commands to
verify your IPv6 settings.
This section includes the following topics:
• The show ipv6 interface Command, page 12-11
•
The show ipv6 route Command, page 12-12
The show ipv6 interface Command
To display the IPv6 interface settings, enter the following command:
hostname# show ipv6 interface [ if_name ]
Including the interface name, such as “outside”, displays the settings for the specified interface.
Excluding the name from the command displays the setting for all interfaces that have IPv6 enabled on
them. The output for the command shows the following:
• The name and status of the interface.
•
The link-local and global unicast addresses.