Interface-Level VLAN-SGT Mapping

Release Notes for Cisco IOS XE 17.16.1

Software Features in Cisco IOS XE 17.16.1

Feature Name: ECMP Support with NAT Scale
Applicable Models:C9600-SUP-1
Description:NAT translation now focuses solely on source IP addresses, simplifying NAT session management by using just two TCAM entries per source, regardless of the number of destination IPs. This change optimises resource utilisation in ECMP (Equal Cost Multipath) topologies, which distribute traffic across multiple same-cost paths to enhance network efficiency. ECMP can be applied independently on NAT inside and outside interfaces, supporting both static and dynamic NAT rules. For consistent NAT behaviour, ensure all routing paths in an ECMP setup are NAT enabled.

Feature Name:Interface-Level VLAN-SGT Mapping
Applicable Models:All Models
Description:The Interface-Level VLAN-SGT Mapping feature allows users to assign SGTs to VLANs on a per-interface basis. This feature supports both voice VLAN and data VLAN to SGT mapping, providing enhanced security and flexibility.

Feature Name:Multicast Flow-aware SG Timer
Applicable Models:All Models
Description:This feature introduces a mechanism to extend the expiry timer for newly created (S,G) mroute traffic. The ip mroute extend-timer command is introduced.

Feature Name:Multicluster Fabric: Router MAC Rewrite with Next-Hop Self BGP Attribute
Applicable Models:All Models
Description:This feature simplifies the process of interconnecting multiple EVPN fabrics by automatically handling nexthop rewrites at the fabric boundary. For VxLAN environments, the nexthop IP address is seamlessly updated to the local VTEP IP address, along with the VTEP Router MAC address and VNI. In MPLS setups, the nexthop is efficiently rewritten with the neighbour's update-source IP address and VRF label.

Feature Name:Programmability: YANG Data Models
Applicable Models:All Models
Description:The following programmability features are introduced in this release:

YANG Data Models: For the list of Cisco IOS XE YANG models available with this release, navigate to: https://github.com/YangModels/yang/tree/main/vendor/cisco/xe/17161.

Feature Name:Quad-Supervisor with Route Processor Redundancy (RPR)
Applicable Models:C9600X-SUP-2
Description:A Quad-Supervisor RPR setup provides intra-chassis redundancy where Cisco StackWise Virtual is configured between two chassis. The added redundancy reduces the time taken to reach the ready state with full bandwidth in the event of a failure or a forced switchover.

Feature Name:Split ARP and ForUS Packets to 2 Separate Queues
Applicable Models:All Models
Description:This feature introduces separate policers for For US and ARP queues to enhance traffic management.

Open Caveats in Cisco IOS XE 17.16.x

• There are no open caveats in this release.

Resolved Caveats in Cisco IOS XE 17.16.1
CSCwm84140:Cat 9500/9600 Sup-1 SVL: Unexpected Standby Reload due to TMPFS Space Exhaustion