Cisco IOS Software Release 15.1(3)T is the third in a series of individual 15.1T releases. This release offers features from Releases 15.1(1)T and 15.1(2)T, and it introduces new technology and hardware support.
Release 15.1(3)T includes the following important capabilities
Selective Packet Discard (SPD) for IPv6 provides a congestion control mechanism for the interface input queues and additional queuing capacity for control plane traffic.
Performance Monitor gives real-time metrics for rich-media streams. Fully integrated with Mediatrace, it provides automatic path discovery of the traffic stream and can discover both Layer 3 and Layer 2 devices along the path.
IPv6 Rapid Deployment (6rd) allows incremental deployment of IPv6 unicast through existing IPv4 service provider (SP) networks.
Cisco IOS SSL VPN Smart Tunnels Support capability lets you identify the applications to which you want to grant smart tunnel access. Specify the path to the application and the SHA-1 hash of its checksum to check before granting it access.
Cisco Advanced Foreign Exchange Station (FXS) Analog Gateway features Skinny Client Control Protocol (SCCP) over Transport Layer Security (TLS) with Cisco Unified Communications Manager. You get granular troubleshooting capabilities during initial network provisioning.
Release 15.1(3)T is a Standard Maintenance release. Refer to the Release Notes for Cisco IOS Software Release 15.1(3)T for specific hardware platform support.