Cisco Cisco IOS XR Software Release 4.2 Notas de publicación

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Release Notes for Cisco ASR 9000 Series Aggregation Services Routers for Cisco IOS XR Software Release 4.2
OL-26126-01
System Requirements
Quality of Service (QoS)—This supports QoS mechanisms including policing, marking, queuing, 
random and hard traffic dropping, and shaping. Additionally, Cisco IOS XR supports modular QoS 
command-line interface (MQC). MQC is used to configure various QoS features on various Cisco 
platforms, including the Cisco ASR 9000 Series Aggregation Services Router. Supports the 
following:
Class-Based Weighted Fair Queuing (CBWFQ)
Weighted Random Early Detection (WRED)
Priority Queuing with propagation
2-rate 3-color (2R3C) Policing
Modular QoS CLI (MQC)
4-level Hierarchical-QoS
Shared Policy Instances
Manageability—This provides industry-standard management interfaces including modular 
command-line interface (CLI), Simple Network Management Protocol (SNMP), and native 
Extensible Markup Language (XML) interfaces. Includes a comprehensive set of Syslog messaging.
Security—This provides comprehensive network security features including Layer 2 and Layer 
3access control lists (ACLs); routing authentications; Authentication, Authorization, and 
Accounting (AAA)/Terminal Access Controller Access Control System (TACACS+), Secure Shell 
(SSH), Management Plane Protection (MPP) for control plan security, and Simple Network 
Management Protocol version3 (SNMPv3). Control plane protections integrated into line card 
Application-Specific Integrated Circuits (ASICs) include Generalized TTL Security Mechanism 
(GTSM), RFC 3682, and Dynamic Control Plane Protection (DCPP).
Availability—This supports rich availability features such as fault containment, fault tolerance, fast 
switchover, link aggregation, nonstop routing for ISIS, LDP and OSPF, and nonstop forwarding 
(NSF).
Enhanced core competencies:
IP fast convergence with Fast Reroute (FRR) support for Intermediate System-to-Intermediate 
System (IS-IS)
Path Computation Element (PCE) capability for traffic engineering
For more information about new features provided on the 
Cisco ASR 9000 Series Aggregation Services Router platform for Cisco IOS XR Software Release 
4.0.3, see the 
 in this 
document. 
System Requirements
This section describes the system requirements for 
Cisco ASR 9000 Series Aggregation Services Router Software Release 4.2. The system requirements 
include the following information: