router>show ipv6 interface brief FastEthernet0/0 [up/up] FE80::222:90FF:FEB0:1098 2001:DB8:2:93::3 200A:1::1 FastEthernet0/1 [up/up] FE80::222:90FF:FEB0:1099 2001:DB8:2:94::1 Serial0/0/0 [down/down] unassigned Serial0/0/0.4 [down/down] unassigned Serial0/0/0.5 [down/down] unassigned Serial0/0/0.6 [down/down] unassigned

interface FastEthernet0/1 ipv6 address 2001:0DB8:C18:1::/64 eui-64 ! interface FastEthernet0/2 ipv6 enable

A Cisco device running an affected version of Cisco IOS Software or Cisco IOS XE Software release and has IPv6 enabled will show interfaces with assigned IPv6 addresses when thecommand is issued.Thecommand will produce an error message if the running version of Cisco IOS Software or Cisco IOS XE Software release does not support IPv6, or will not show any interfaces with IPv6 addresses if IPv6 is disabled. The system is not vulnerable in either scenario.The following example shows the output from thecommand issued on a device running Cisco IOS Software enabled for IPv6:The IPv6 protocol is enabled if the interface configuration commandoris present in the configuration; however, both may be present. The following examples shows a vulnerable configuration with both present:A device running Cisco IOS Software or Cisco IOS XE Software with IPv6 enabled on a physical or logical interface is vulnerable even ifis globally disabled (that is, the device is not routing IPv6 packets).

To determine the Cisco IOS Software release that is running on a Cisco product, administrators can log in to the device and issue the show version command to display the system banner. The system banner confirms that the device is running Cisco IOS Software by displaying text similar to "Cisco Internetwork Operating System Software" or "Cisco IOS Software." The image name displays in parentheses, followed by "Version" and the Cisco IOS Software release name. Other Cisco devices do not have the show version command or may provide different output.

The following example identifies a Cisco product that is running Cisco IOS Software Release 15.2(4)M5 with an installed image name of C3900-UNIVERSALK9-M:

Router> show version

Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), 15.2(4)M5, RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2013 by Cisco Systems, Inc.

Compiled Fri 13-Sep-13 16:44 by prod_rel_team !--- output truncated

Additional information about Cisco IOS Software release naming conventions is available in White Paper: Cisco IOS and NX-OS Software Reference Guide.