There are no new hardware features in the Cisco IOS XE Release 3.18.1SP.

• FlexLSP Inter-area support on non co-routed mode

  Flex LSP supports inter-area tunnels with non co-routed mode. For more information on the restrictions for this feature and its configuration details, see MPLS Basic Configuration Guide for Cisco NCS 4200 Series.

• Leap Second

  Starting with Cisco IOS-XE Release 3.18.1SP, you can configure the leap second event date and Offset value (+1 or -1) on master ordinary clock, hybrid boundary clock, dynamic ports, and virtual ports. The following two new keywords are added to the utc-offset command:

  • leap-second

  • offset

  You can also configure time properties holdover time on boundary clock, hybrid boundary clock, and dynamic ports. The following new command is introduced:

  • time-properties persist

  For more information, see Cisco NCS 4200 Series Software Configuration Guide.

  For more information, see Cisco IOS Interface and Hardware Component Command Reference.

• WAN-PHY Support

  Effective Cisco IOS XE 3.18.1SP, A900-IMA8Z Interface Modules support LAN/WAN-PHY mode.

  For more information, see Cisco NCS 4200 Series Software Configuration Guide.