15-20
Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter15 Completing Interface Configuration (Transparent Mode, 8.4 and Later)
Completing Interface Configuration in Transparent Mode (8.4 and Later)
•Reachable Time—Enter the amount of time in seconds that a remote IPv6 node is considered
reachable after a reachability confirmation event has occurred. Valid values are from 0 to 3600000
milliseconds. The default is zero. A configured time enables the detection of unavailable neighbors.
Shorter times enable detection more quickly; however, very short configured times are not
recommended in normal IPv6 operation.
Step7 Click OK.
You return to the Configuration > Device Setup > Interfaces pane.
(Optional) Configuring the Link-Local Addresses Automatically
If you do not want to configure a global address, and only need to configure a link-local address, you
have the option of generating the link-local addresses based on the interface MAC addresses (Modified
EUI-64 format. Because MAC addresses use 48 bits, additional bits must be inserted to fill the 64 bits
required for the interface ID.)
To manually assign the link-local address (not recommended), see the “(Optional) Configuring the
Link-Local Addresses Manually” section on page15-20.
For other IPv6 options, including enforcing the Modified EUI-64 format, and DAD settings, see the
“Configuring a Global IPv6 Address and Other Options” section on page 15-18.
To automatically configure the link-local addresses for a management interface or bridge group member
interfaces, perform the following steps:
Step1 Choose the Configuration > Device Setup > Interfaces pane.
Step2 Select a BVI or management interface, and click Edit.
The Edit Interface dialog box appears with the General tab selected.
Step3 Click the IPv6 tab.
Step4 In the IPv6 configuration area, check Enable IPv6.
This option enables IPv6 and automatically generates the link-local addresses for member interfaces
using the Modified EUI-64 interface ID based on the interface MACaddress.
Note You do not need to check this option if you configure any IPv6 addresses (either global or
link-local); IPv6 support is automatically enabled as soon as you assign an IPv6 address.
Similarly, unchecking this option does not disable IPv6 if you configured IPv6 addresses.
Step5 Click OK.
(Optional) Configuring the Link-Local Addresses Manually
If you do not want to configure a global address, and only need to configure a link-local address on the
physical interfaces or subinterfaces, you have the option of manually defining the link-local address.
Note that we recommend automatically assigning the link-local address based on the Modified EUI-64
format. For example, if other devices enforce the use of the Modified EUI-64 format, then a
manually-assigned link-local address may cause packets to be dropped.